plat 025

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PLAT-025 — workspace shell buffers stdout without a memory bound

Coordination	Value
Assigned agent	Claude Code
Ticket state	queued
Execution order	D — after A, B, and E
Last synchronized	2026-08-04

Claim this ticket as in_progress before implementation. Update this fragment during active work; synchronize the shared index at handoff.

• Priority: P1 availability
• Owner: workspace/handlers/shell.go subprocess output capture
• Evidence: the handler accumulates complete stdout in stdoutBuf before the downstream agent-facing cap can run.
• Source: what_the_runtime_tells_an_agent_about_itself.md
• Problem: a runaway or extremely verbose command can grow server memory without bound. Applying the existing downstream truncation blindly would corrupt scripted steps that require complete schema-validated JSON.
• Implementation boundary: introduce bounded capture/spooling with an explicit full-output path for consumers that require it. Do not silently truncate scripted-step results.
• Acceptance: a large-output fixture keeps resident capture bounded, agent-facing output follows the existing head/tail contract, scripted JSON is either delivered completely or fails explicitly, and cancellation removes any temporary resource.