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fix(#214): apply OpenCode write-truncation contract to all large-file writer agents (#599)

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* fix(#214): apply OpenCode write-truncation contract to all large-file writer agents

Issue #214 / PR #598 fixed gsd-phase-researcher's OpenCode write-tool
truncation by adding a single-Write-default + sentinel-based
Write->Read->Edit incremental fallback contract to its Step 6. The root
cause is upstream opencode#18108: OUTPUT_TOKEN_MAX=32000 is shared with
the thinking budget, so a single oversized `write` tool call's JSON is
truncated mid-payload (`JSON Parse error: Expected '}'`) and OpenCode
doom-loops.

The same failure affects every GSD subagent that writes a large file in
one Write call. Mirror the phase-researcher write contract (adapted per
output filename) into the other large-file writers:

- gsd-research-synthesizer (SUMMARY.md) — extends the existing bug-222
  hard-rules block with the truncation fallback as rule 6, preserving
  every original rule
- gsd-planner (PLAN.md)
- gsd-executor (SUMMARY.md)
- gsd-domain-researcher (AI-SPEC.md Section 1b)
- gsd-project-researcher (.planning/research/*.md)
- gsd-ui-researcher (UI-SPEC.md)

Each keeps the single-Write default (no behavior change for Claude Code
and other non-truncating runtimes) and falls back to incremental,
sentinel-based section-by-section writes only on a truncation/invalid-tool
failure; never silently falls back to returning content.

Locked with a parametrized prompt-contract regression test mirroring the
bug-214 / bug-222 pattern across all six agents.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* chore(#214): set changeset pr to 599

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
2026-06-01 22:31:37 -04:00
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parent 82fb847754
commit a594f5175c
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---
type: Fixed
pr: 599
---
**Large-file GSD writer agents no longer fail to write their output on OpenCode** — `gsd-research-synthesizer`, `gsd-planner`, `gsd-executor`, `gsd-domain-researcher`, `gsd-project-researcher`, and `gsd-ui-researcher` now carry the same truncation-resilient write contract added for `gsd-phase-researcher` in #214. Each keeps its single-write default and falls back to an incremental, sentinel-based Write→Read→Edit sequence only when a runtime truncates an oversized tool call (upstream opencode#18108), instead of doom-looping on `JSON parsing failed: Expected '}'`.