feat: add session lifecycle hooks with trajectory serialization#1165
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Add session.pre, session.post, session.userQuery.pre, and session.userQuery.post plugin hooks to SessionPrompt.runLoop. Hooks fire reliably via Effect.onExit and include full trajectory data for replay. Also adds getEnvInfo/getEnvTelemetry utilities.
Remove getEnvTelemetry from env-info.ts, its export from index.ts, and the corresponding test case from env-info.test.ts.
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Summary
session.pre,session.post,session.userQuery.pre,session.userQuery.postplugin hooks toSessionPrompt.runLoopEffect.onExit— guaranteed even on thrown failures/interruptionsTrajectoryMessage[]) for replay with field-level fidelitygetEnvInfo/getEnvTelemetryutilities for environment metadata collectionDetails
Plugin hooks:
session.pre— fires once before the first LLM step; supports cancellation viaoutput.cancelsession.post— fires once when runLoop ends; reportsoutcome: "completed" | "error" | "cancelled"with final text and trajectorysession.userQuery.pre— fires before each LLM step; supports per-step cancellationsession.userQuery.post— fires after each LLM step (viaEffect.onExit); includes error, finalText, and step trajectoryTrajectory types (
TrajectoryMessage,TrajectoryPart) in@mimo-ai/pluginprovide the wire format for full raw agent slice replay.Tests: unit tests for trajectory serialization, env-info, and session-loop hook integration.