feat: AgentState persistence for PreCompact recovery (Bet 2 slice 3)#267
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feat: AgentState persistence for PreCompact recovery (Bet 2 slice 3)#267
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Adds per-attempt AgentState bag that tracks modified files, last structured status, and compaction count. Serializes to a deterministic tmpdir path so a future post-compaction UserPromptSubmit hook can hydrate the agent back with the context that compaction dropped. - New src/lib/agent-state.ts — AgentState class with setAttemptId, recordModifiedFile, recordStatus, recordCompaction, snapshot, persist, snapshotPath, reset. Schema versioned as amplitude-wizard-agent-state/1. - Instantiated per runAgent call; reset between retry attempts. - Wired into StatusReporter.onStatus so the persisted snapshot always carries the most recent status message. - +11 tests (agent-state.test.ts) covering dedup/sort, status tracking, compaction count, JSON schema, tmpdir path, reset semantics. Bet 2 slice 3. Recreated from #126 onto kelsonpw/agent-loop-status-recovered after the 2026-04-20 history reset. Hook-factory wiring for PreCompact and PostToolUse depends on Bet 1 ToolCallCounters landing first (PR #149); this slice ships the persistence primitive so later slices can wire it up with zero merge friction.
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This was referenced Apr 26, 2026
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Replaces #173 (auto-closed when its base branch was deleted on the merge of #172). Same single commit, rebased onto current
main(post-#266, post-#172).What this slice adds
A new
AgentStaterecovery bag (src/lib/agent-state.ts) that holds per-attempt context — modified files, last reported status, attempt id — so a future PreCompact hook can persist a snapshot before the SDK compacts the conversation. Slice 4 (#174 follow-up) hydrates from this snapshot viaUserPromptSubmit.Scope
src/lib/agent-state.ts— pure data class, 10 unit testssrc/lib/__tests__/agent-state.test.tsagent-interface.ts: instantiateagentStateper run, set attempt id at the top of each retry, record status reports into it. No behavior change yet — the snapshot is built but not yet persisted (that's the PreCompact hook in a follow-up slice).Test plan
pnpm tsc --noEmit✅pnpm test— 1295 passed (was 1285 after feat: structured status via report_status MCP tool (Bet 2 slice 2) #172) — +10 fromagent-state.test.tspnpm lint✅ (1 pre-existing unrelated warning)mainafter fix(agent): ride out gateway 400-terminated cascades #266 (gateway resilience) and feat: structured status via report_status MCP tool (Bet 2 slice 2) #172 (report_status)🤖 Generated with Claude Code
Note
Low Risk
Low risk: adds a new state snapshot utility and wires it to status reporting/retry resets without changing core agent decision logic; primary impact is small tmpdir file I/O when
persist()is invoked.Overview
Adds a new
AgentStatemodule that tracks per-attempt recovery context (modified files, last structured status, compaction count, run/attempt IDs) and can persist a schema-versioned JSON snapshot to a deterministic tmpdir path.Wires
AgentStateintorunAgentso each retry attempt sets anattemptId, recordsreport_statusupdates, and resets state between retries, and includes new Vitest coverage validating dedupe/sort behavior and snapshot persistence semantics.Reviewed by Cursor Bugbot for commit eb8889a. Bugbot is set up for automated code reviews on this repo. Configure here.