fix(runner): surface Pi provider errors instead of "The agent produced no output"

[mmabrouk]

Context

Any Pi harness provider failure (bad API key, out of quota, model 404) reached the end user as the generic message "The agent produced no output." The real provider error was discarded, so users had no idea what actually went wrong.

Root cause: commit 42075a5e9f moved Pi session transcripts from the Pi agent dir to <cwd>/agents/sessions/pi/ (via PI_CODING_AGENT_SESSION_DIR), but did not update the caller of findSwallowedPiError. The callsite still passed the old Pi agent dir, which no longer contains any transcript, so the helper found nothing and the generic "no output" fallback won.

Changes

findSwallowedPiError now takes the run cwd and derives the transcript location from piSessionWorkspaceDir, the same shared helper configurePiSessionWorkspace uses to point Pi at it, so the reader and the writer can never construct the path independently again.

Before: on a provider failure the user saw

The agent produced no output.

After: the user sees the real error, for example

Incorrect API key provided.

Tests / notes

• pnpm test in services/runner: all pass. pnpm run typecheck: clean.
• The tests in sandbox-agent-pi-error.test.ts now write transcripts through piSessionWorkspaceDir too (flat layout, as Pi does with an explicit session dir), so they pin the shared-helper contract rather than a hand-built path.
• No formatter runs on services/runner/** (the pre-commit prettier hook is scoped to web/), so this is tsc + tests only.

https://claude.ai/code/session_01Hyn9365BLPXDmNZShrQkmH

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[mmabrouk]

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Updated at 2026-07-14T19:35:19.472Z

[mmabrouk]

lgtm