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-rw-r--r--docs/plans/local-oss-runner.md50
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+++ b/docs/plans/local-oss-runner.md
@@ -304,3 +304,53 @@ What the LLM can do with that: produce a tighter, project-aware investigation pr
- All new tests green under `-race`
- Existing webhook tests pass byte-for-byte when LLM not configured
- Build clean; pushed
+
+---
+
+# Phase 4 — Focused Plan (Execution Summary)
+
+## Scope
+
+`extractSummary` in `internal/executor/summary.go` is text-pattern based: it returns the body following the last `## Summary` heading in any assistant text block. When the agent didn't write one, summary stays empty. This is fine for Claude (which is prompted to write a summary), but not for arbitrary local-runner outputs, and not for cases where Claude exits early or hits a budget cap before the summary section.
+
+Phase 4 adds an LLM-based fallback: when `extractSummary` returns "" and the Pool has an LLM client, synthesize a 2-4 sentence summary from the tail of the stdout log.
+
+## What ships
+
+- New `synthesizeSummary(ctx, *llm.Client, stdoutPath string) string` in `internal/executor/summary.go`. Reads the last ~16 KB of the stdout log, strips stream-json envelopes to extract just the text content, and asks the LLM to summarize.
+- New `LLM *llm.Client` field on `executor.Pool` (wired identically to `Classifier.LLM` in Phase 1).
+- Hook into `Pool.handleRunResult` at the existing summary block: after `extractSummary` returns "", call `synthesizeSummary` if `p.LLM != nil`.
+- Wiring in `cmd/claudomator/main.go` (none — main.go is a thin wrapper), `internal/cli/serve.go`, `internal/cli/run.go`: pass `localClient` to Pool.
+
+## Explicit non-goals
+
+- No changes to the Claude prompt or the `## Summary` extraction (that path stays primary)
+- No changes to the storage schema (summary is already a `tasks.summary` TEXT column via `UpdateTaskSummary`)
+- No streaming the summary — one-shot 2-4 sentence completion
+- No new config knob for "prefer local for summary" — same `s.llm`/`p.LLM` gate applies; users opt out by not setting LocalModel.Endpoint
+- No retroactive backfill of summaries on existing executions
+
+## Task list
+
+1. Add `LLM *llm.Client` field on `executor.Pool` (matches the `Classifier` pattern from Phase 1)
+2. Implement `synthesizeSummary(ctx, *llm.Client, stdoutPath) string` in `internal/executor/summary.go`. Reads last ~16 KB, parses each line as a stream-json event, joins the assistant text content, calls `Chat` with a 6-second timeout asking for 2-4 sentences plain text. Returns "" on any error so the caller's existing empty-summary path stays unchanged.
+3. Modify `Pool.handleRunResult`: after `extractSummary` returns empty, if `p.LLM != nil`, try `synthesizeSummary(ctx, p.LLM, exec.StdoutPath)`. If it returns non-empty, persist via `UpdateTaskSummary`.
+4. Wire `Pool.LLM = localClient` in `internal/cli/serve.go` and `internal/cli/run.go`
+5. Tests in `internal/executor/summary_test.go` (or a new file):
+ - `synthesizeSummary` with stub LLM: stdout.log containing stream-json text → assistant content extracted → LLM called → returned summary
+ - `synthesizeSummary` with no `## Summary` heading anywhere → still produces synthesized summary
+ - `synthesizeSummary` LLM failure → returns ""
+ - `synthesizeSummary` empty stdout file → returns ""
+ - Pool integration test: LocalRunner produces a stdout with no `## Summary` section, Pool's LLM is set, after handleRunResult the task's summary is non-empty
+6. `go build ./... && go test -race ./...`
+7. Commit as Phase 4 on the branch
+8. Push
+
+## Stop conditions
+
+- New tests green under `-race`
+- Existing tests unchanged (the extractSummary primary path keeps winning whenever a `## Summary` heading exists)
+- Build clean; pushed
+- Epic complete: `## Local OSS Models as a Third Runner` shipped end-to-end
+
+After Phase 4 lands, execute the post-epic deep cleanup using the queue at the top of this section.