Genkit JS API reference
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    Class SessionRunner<State>

    Executor responsible for running turns over input streams and persisting state.

    Type Parameters

    • State = unknown
    Index

    Constructors

    constructor

    Properties

    firstCustomPatchInTurn inputCh isDetached lastGoodSnapshotId? lastGoodState? lastTurnError? lastTurnFinishReason? newSnapshotId? onDetach? onEndTurn? session turnIndex

    Methods

    addArtifacts addMessages getArtifacts getCustom getMessages getState maybeSnapshot run setMessages updateCustom

    Constructors

    • Type Parameters

      • State = unknown

      Parameters

      • session: Session<State>
      • inputCh: AsyncIterable<
            {
                detach?: boolean;
                message?: {
                    content: (
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text: string;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media: { contentType?: string; url: string };
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest: {
                                input?: unknown;
                                name: string;
                                partial?: boolean;
                                ref?: string;
                            };
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse: { name: string; output?: unknown; ref?: string } & {
                                content?: (...)[];
                            };
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom: Record<string, any>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning: string;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource: { uri: string };
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                    )[];
                    metadata?: Record<string, unknown>;
                    role: "user" | "model" | "tool" | "system";
                };
                resume?: {
                    respond?: {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse: { name: string; output?: unknown; ref?: string } & {
                            content?: (...)[];
                        };
                    }[];
                    restart?: {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest: {
                            input?: unknown;
                            name: string;
                            partial?: boolean;
                            ref?: string;
                        };
                        toolResponse?: undefined;
                    }[];
                };
            },
        >
      • Optionaloptions: {
            abortSignal?: AbortSignal;
            lastSnapshot?: SessionSnapshot<State>;
            onDetach?: (snapshotId: string) => void;
            onEndTurn?: (
                snapshotId?: string,
                finishReason?:
                    | "length"
                    | "stop"
                    | "failed"
                    | "other"
                    | "unknown"
                    | "interrupted"
                    | "blocked"
                    | "aborted"
                    | "detached",
            ) => void;
            store?: SessionStore<State>;
        }

      Returns SessionRunner<State>

    Properties

    firstCustomPatchInTurn: boolean

    True until the first customPatch chunk of the current turn has been emitted. The first patch of every turn is a whole-document replace (re-basing clients that may not share the server's baseline); reset to true at the start of each turn.

    inputCh: AsyncIterable<
        {
            detach?: boolean;
            message?: {
                content: (
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text: string;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media: { contentType?: string; url: string };
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest: {
                            input?: unknown;
                            name: string;
                            partial?: boolean;
                            ref?: string;
                        };
                        toolResponse?: undefined;
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse: { name: string; output?: unknown; ref?: string } & {
                            content?: (...)[];
                        };
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                    | {
                        custom: Record<string, any>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning: string;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                    | {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource: { uri: string };
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse?: undefined;
                    }
                )[];
                metadata?: Record<string, unknown>;
                role: "user" | "model" | "tool" | "system";
            };
            resume?: {
                respond?: {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse: { name: string; output?: unknown; ref?: string } & {
                        content?: (...)[];
                    };
                }[];
                restart?: {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest: {
                        input?: unknown;
                        name: string;
                        partial?: boolean;
                        ref?: string;
                    };
                    toolResponse?: undefined;
                }[];
            };
        },
    >
    isDetached: boolean
    lastGoodSnapshotId?: string

    The snapshotId of the most recently successful (persisted, done) turn. On a failed turn this is the last-good snapshot the caller resumes from; undefined when no turn has succeeded yet (e.g. a first-turn failure).

    lastGoodState?: SessionState<State>

    The state the most recently successful turn left behind. On a failed turn this is the state the failed turn started with - the last-good state returned to the caller (for client-managed agents).

    lastTurnError?: AgentErrorDetails

    Error details of the most recent failed turn. Set when a turn throws and the runner resolves gracefully instead of propagating the exception.

    lastTurnFinishReason?:
        | "length"
        | "stop"
        | "failed"
        | "other"
        | "unknown"
        | "interrupted"
        | "blocked"
        | "aborted"
        | "detached"

    The finish reason of the most recently completed turn.

    newSnapshotId?: string
    onDetach?: (snapshotId: string) => void
    onEndTurn?: (
        snapshotId?: string,
        finishReason?:
            | "length"
            | "stop"
            | "failed"
            | "other"
            | "unknown"
            | "interrupted"
            | "blocked"
            | "aborted"
            | "detached",
    ) => void
    session: Session<State>
    turnIndex: number

    Methods

    • Adds artifacts to the session, deduplicating by name.

      Parameters

      • artifacts: {
            metadata?: Record<string, any>;
            name?: string;
            parts: (
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text: string;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media: { contentType?: string; url: string };
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest: {
                        input?: unknown;
                        name: string;
                        partial?: boolean;
                        ref?: string;
                    };
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse: { name: string; output?: unknown; ref?: string } & {
                        content?: (
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                        )[];
                    };
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom: Record<string, any>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning: string;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource: { uri: string };
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
            )[];
        }[]

      Returns void

    • Appends messages to the session.

      Parameters

      • messages: {
            content: (
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text: string;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media: { contentType?: string; url: string };
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest: {
                        input?: unknown;
                        name: string;
                        partial?: boolean;
                        ref?: string;
                    };
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse: { name: string; output?: unknown; ref?: string } & {
                        content?: (
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                        )[];
                    };
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom: Record<string, any>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning: string;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource: { uri: string };
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
            )[];
            metadata?: Record<string, unknown>;
            role: "user" | "model" | "tool" | "system";
        }[]

      Returns void

    • Retrieves the list of artifacts generated during the session.

      Returns {
          metadata?: Record<string, any>;
          name?: string;
          parts: (
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text: string;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media: { contentType?: string; url: string };
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest: {
                      input?: unknown;
                      name: string;
                      partial?: boolean;
                      ref?: string;
                  };
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse: { name: string; output?: unknown; ref?: string } & {
                      content?: (
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                      )[];
                  };
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom: Record<string, any>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning: string;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource: { uri: string };
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
          )[];
      }[]

    • Retrieves the custom state of the session.

      Returns State | undefined

    • Retrieves all messages associated with the session.

      Returns {
          content: (
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text: string;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media: { contentType?: string; url: string };
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest: {
                      input?: unknown;
                      name: string;
                      partial?: boolean;
                      ref?: string;
                  };
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse: { name: string; output?: unknown; ref?: string } & {
                      content?: (
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning: ...;
                              resource?: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                          | {
                              custom?: ...;
                              data?: ...;
                              media?: ...;
                              metadata?: ...;
                              reasoning?: ...;
                              resource: ...;
                              text?: ...;
                              toolRequest?: ...;
                              toolResponse?: ...;
                          }
                      )[];
                  };
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom: Record<string, any>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning: string;
                  resource?: undefined;
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
              | {
                  custom?: Record<string, unknown>;
                  data?: unknown;
                  media?: undefined;
                  metadata?: Record<string, unknown>;
                  reasoning?: undefined;
                  resource: { uri: string };
                  text?: undefined;
                  toolRequest?: undefined;
                  toolResponse?: undefined;
              }
          )[];
          metadata?: Record<string, unknown>;
          role: "user" | "model" | "tool" | "system";
      }[]

    • Saves a snapshot of the current session state to the persistent store.

      When a store is configured every turn is persisted (snapshotting is no longer opt-out). Uses the mutator-based saveSnapshot to atomically check that the snapshot has not been concurrently aborted before writing - preventing a race where a "done" write could overwrite a concurrent "aborted" status.

      Parameters

      • Optionalstatus: "failed" | "completed" | "pending"
      • Optionalerror: { details?: any; message: string; status?: string }
      • OptionalsnapshotId: string
      • OptionalfinishReason:
            | "length"
            | "stop"
            | "failed"
            | "other"
            | "unknown"
            | "interrupted"
            | "blocked"
            | "aborted"
            | "detached"

      Returns Promise<string | undefined>

    • Executes the flow handler against incoming input messages sequentially.

      The handler receives the turn's AgentInput and a TurnContext whose snapshotId is reserved up front - it is the id the snapshot persisted at turn end will reuse. This lets a handler set up external, snapshot-correlated state (e.g. a git branch/worktree named after the snapshot) before generating, then commit it under that id.

      The handler may return a TurnResult carrying an explicit finishReason for the just-completed turn. When omitted, no per-turn reason is reported. Failures always report failed.

      Parameters

      • fn: (
            input: {
                detach?: boolean;
                message?: {
                    content: (
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text: string;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media: { contentType?: string; url: string };
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest: {
                                input?: unknown;
                                name: string;
                                partial?: boolean;
                                ref?: string;
                            };
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse: { name: string; output?: unknown; ref?: string } & {
                                content?: (...)[];
                            };
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom: Record<string, any>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning: string;
                            resource?: undefined;
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                        | {
                            custom?: Record<string, unknown>;
                            data?: unknown;
                            media?: undefined;
                            metadata?: Record<string, unknown>;
                            reasoning?: undefined;
                            resource: { uri: string };
                            text?: undefined;
                            toolRequest?: undefined;
                            toolResponse?: undefined;
                        }
                    )[];
                    metadata?: Record<string, unknown>;
                    role: "user" | "model" | "tool" | "system";
                };
                resume?: {
                    respond?: {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest?: undefined;
                        toolResponse: { name: string; output?: unknown; ref?: string } & {
                            content?: (...)[];
                        };
                    }[];
                    restart?: {
                        custom?: Record<string, unknown>;
                        data?: unknown;
                        media?: undefined;
                        metadata?: Record<string, unknown>;
                        reasoning?: undefined;
                        resource?: undefined;
                        text?: undefined;
                        toolRequest: {
                            input?: unknown;
                            name: string;
                            partial?: boolean;
                            ref?: string;
                        };
                        toolResponse?: undefined;
                    }[];
                };
            },
            ctx: TurnContext,
        ) => Promise<void | TurnResult>

      Returns Promise<void>

    • Overwrites the session messages.

      Parameters

      • messages: {
            content: (
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text: string;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media: { contentType?: string; url: string };
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest: {
                        input?: unknown;
                        name: string;
                        partial?: boolean;
                        ref?: string;
                    };
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse: { name: string; output?: unknown; ref?: string } & {
                        content?: (
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning: ...;
                                resource?: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                            | {
                                custom?: ...;
                                data?: ...;
                                media?: ...;
                                metadata?: ...;
                                reasoning?: ...;
                                resource: ...;
                                text?: ...;
                                toolRequest?: ...;
                                toolResponse?: ...;
                            }
                        )[];
                    };
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom: Record<string, any>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning: string;
                    resource?: undefined;
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
                | {
                    custom?: Record<string, unknown>;
                    data?: unknown;
                    media?: undefined;
                    metadata?: Record<string, unknown>;
                    reasoning?: undefined;
                    resource: { uri: string };
                    text?: undefined;
                    toolRequest?: undefined;
                    toolResponse?: undefined;
                }
            )[];
            metadata?: Record<string, unknown>;
            role: "user" | "model" | "tool" | "system";
        }[]

      Returns void

    • Updates the custom state using a mutator function.

      Parameters

      Returns void

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