fix(#571): forbid Write in doc-writer fix mode; add workflow truncation guard
* fix(#571): forbid Write in doc-writer fix mode; add workflow truncation guard gsd-doc-writer in fix mode only had Write in its tools list, so when correcting a specific failing claim it would re-emit the whole file with only the lines it had in context — truncating untracked docs with no git recovery path. Fix 1 (root cause): add Edit to the agent tools frontmatter and rewrite fix_mode instructions to mandate Edit for surgical corrections and explicitly forbid Write on existing files. Also reinforced in critical_rules. Fix 2 (safety net): add a post-fix line-count guard in the fix_loop step of docs-update.md. If the file shrank by >90% after a fix agent runs, the orchestrator restores the file from the existing_content it captured before dispatch and logs a WARNING. This makes the previously unrecoverable case recoverable. Regression test: tests/bug-571-doc-writer-fix-mode-edit-only.test.cjs covers both the agent contract and the workflow guard. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * chore: add changeset for fix #571 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * fix(#571): address codex adversarial review findings - Quote {doc_path} in shell snippets to handle paths with spaces (#SECURITY) - Clarify corrupted doc re-verification vs re-fix distinction (#CORRECTNESS) - Strengthen regression tests with structural ordering assertions (#REGRESSION) - Move docs-update.md from global ALLOWLIST to SIZE_ONLY_WORKFLOWS so injection scanning still runs while only the 50K size finding is exempt (#SECURITY) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Tom Boucher
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tests/bug-571-doc-writer-fix-mode-edit-only.test.cjs
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tests/bug-571-doc-writer-fix-mode-edit-only.test.cjs
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/**
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* Regression tests for bug #571
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*
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* gsd-doc-writer in fix mode used the Write tool (whole-file replace) instead
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* of the Edit tool (surgical replacement) when correcting specific failing
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* claims. When the target doc was generated but not yet committed, Write could
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* truncate the file to a single line with no git recovery path.
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*
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* Fix 1 (agent): Add Edit to the tools frontmatter and rewrite fix_mode
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* instructions to mandate Edit and explicitly forbid Write on existing files.
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* Fix 2 (workflow): Add a post-fix line-count guard in fix_loop that detects
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* >90% shrinkage and restores the file from existing_content.
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*/
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'use strict';
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// allow-test-rule: source-text-is-the-product
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// Agent .md files are the installed AI agents — their frontmatter and body IS
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// what the runtime loads. Checking text content IS checking the deployed contract.
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const { test, describe } = require('node:test');
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const assert = require('node:assert/strict');
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const fs = require('fs');
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const path = require('path');
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const AGENTS_DIR = path.join(__dirname, '..', 'agents');
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const WORKFLOWS_DIR = path.join(__dirname, '..', 'get-shit-done', 'workflows');
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const AGENT_PATH = path.join(AGENTS_DIR, 'gsd-doc-writer.md');
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const WORKFLOW_PATH = path.join(WORKFLOWS_DIR, 'docs-update.md');
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// ─── Agent fix: Edit in tools frontmatter ────────────────────────────────────
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describe('bug #571: gsd-doc-writer agent', () => {
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const content = fs.readFileSync(AGENT_PATH, 'utf-8');
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test('agent file exists', () => {
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assert.ok(fs.existsSync(AGENT_PATH), 'agents/gsd-doc-writer.md must exist');
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});
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test('tools frontmatter includes Edit', () => {
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const toolsMatch = content.match(/^tools:\s*(.+)$/m);
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assert.ok(toolsMatch, 'gsd-doc-writer.md must have a tools: frontmatter line');
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assert.ok(
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toolsMatch[1].includes('Edit'),
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'tools: frontmatter must include Edit so fix mode can make surgical replacements (#571)'
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);
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});
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// ─── fix_mode instructions ────────────────────────────────────────────────
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describe('fix_mode block', () => {
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const fixStart = content.indexOf('<fix_mode>');
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const fixEnd = content.indexOf('</fix_mode>', fixStart);
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assert.ok(fixStart !== -1 && fixEnd !== -1, '<fix_mode> block must be present and complete');
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const fixBlock = content.slice(fixStart, fixEnd);
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test('fix_mode mandates Edit for corrections', () => {
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assert.ok(
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fixBlock.includes('Edit'),
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'fix_mode must instruct the agent to use the Edit tool for surgical corrections (#571)'
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);
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});
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test('fix_mode explicitly forbids Write on existing files', () => {
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assert.ok(
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fixBlock.includes('NEVER use the Write tool') || fixBlock.includes('NEVER call Write'),
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'fix_mode must explicitly forbid Write on existing files — Write replaces the whole file (#571)'
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);
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});
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test('fix_mode mentions unrecoverable data loss risk of Write', () => {
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assert.ok(
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fixBlock.includes('untracked') || fixBlock.includes('context window') || fixBlock.includes('permanently destroyed'),
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'fix_mode must explain WHY Write is forbidden — unrecoverable data loss for untracked files (#571)'
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);
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});
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});
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// ─── critical_rules ───────────────────────────────────────────────────────
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describe('critical_rules block', () => {
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const rulesStart = content.indexOf('<critical_rules>');
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const rulesEnd = content.indexOf('</critical_rules>', rulesStart);
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assert.ok(rulesStart !== -1 && rulesEnd !== -1, '<critical_rules> block must be present and complete');
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const rulesBlock = content.slice(rulesStart, rulesEnd);
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test('critical_rules forbids Write in fix mode', () => {
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assert.ok(
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rulesBlock.includes('fix mode') && (rulesBlock.includes('NEVER call Write') || rulesBlock.includes('NEVER use the Write')),
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'critical_rules must explicitly forbid Write in fix mode (#571)'
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);
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});
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test('critical_rules Edit rule appears before success_criteria', () => {
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const rulesIdx = content.indexOf('<critical_rules>');
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const successIdx = content.indexOf('<success_criteria>');
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assert.ok(rulesIdx !== -1 && successIdx !== -1, 'both <critical_rules> and <success_criteria> must exist');
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assert.ok(
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rulesIdx < successIdx,
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'<critical_rules> must appear before <success_criteria> (#571)'
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);
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});
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});
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});
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// ─── Workflow fix: post-fix truncation guard in fix_loop ─────────────────────
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describe('bug #571: docs-update workflow fix_loop', () => {
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const content = fs.readFileSync(WORKFLOW_PATH, 'utf-8');
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test('workflow file exists', () => {
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assert.ok(fs.existsSync(WORKFLOW_PATH), 'get-shit-done/workflows/docs-update.md must exist');
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});
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describe('fix_loop step', () => {
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const loopStart = content.indexOf('<step name="fix_loop">');
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const loopEnd = content.indexOf('</step>', loopStart);
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assert.ok(loopStart !== -1 && loopEnd !== -1, 'fix_loop step must be present and complete');
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const loopBlock = content.slice(loopStart, loopEnd);
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test('fix_loop captures pre-fix line count', () => {
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assert.ok(
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loopBlock.includes('PRE_FIX_LINES') || loopBlock.includes('pre-fix line'),
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'fix_loop must capture the pre-fix line count to detect truncation (#571)'
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);
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});
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test('fix_loop checks post-fix line count', () => {
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assert.ok(
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loopBlock.includes('POST_FIX_LINES') || loopBlock.includes('post-fix line'),
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'fix_loop must check the post-fix line count to detect truncation (#571)'
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);
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});
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test('fix_loop restores file on truncation detection', () => {
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assert.ok(
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loopBlock.includes('Restore') || loopBlock.includes('restore'),
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'fix_loop must restore the file from existing_content when truncation is detected (#571)'
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);
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});
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test('fix_loop truncation threshold is >90% shrinkage', () => {
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assert.ok(
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loopBlock.includes('90%') || loopBlock.includes('10%'),
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'fix_loop must use a >90% shrinkage threshold (10% of original) to detect truncation (#571)'
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);
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});
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test('fix_loop logs a WARNING on truncation', () => {
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assert.ok(
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loopBlock.includes('WARNING') || loopBlock.includes('corrupted'),
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'fix_loop must log a WARNING when truncation is detected and restored (#571)'
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);
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});
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// Structural ordering: PRE check → fix agent runs → POST check → restore
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// These ensure the guard is wired in the right sequence, not just present.
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test('PRE_FIX_LINES is captured before POST_FIX_LINES (correct ordering)', () => {
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const preIdx = loopBlock.indexOf('PRE_FIX_LINES');
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const postIdx = loopBlock.indexOf('POST_FIX_LINES');
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assert.ok(preIdx !== -1 && postIdx !== -1, 'both PRE_FIX_LINES and POST_FIX_LINES must be present (#571)');
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assert.ok(
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preIdx < postIdx,
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'PRE_FIX_LINES must appear before POST_FIX_LINES — pre-capture must happen before post-check (#571)'
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);
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});
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test('restore instruction appears after POST_FIX_LINES check (correct ordering)', () => {
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const postIdx = loopBlock.indexOf('POST_FIX_LINES');
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// Find the restore instruction — it follows the threshold comparison
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const restoreIdx = loopBlock.indexOf('existing_content', postIdx);
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assert.ok(
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restoreIdx !== -1 && restoreIdx > postIdx,
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'restore-from-existing_content instruction must appear after the POST_FIX_LINES check (#571)'
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);
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});
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test('fix_loop doc path is quoted in shell snippets', () => {
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// Unquoted paths break on filenames with spaces or shell metacharacters.
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// Verify the bash snippets use quoted "{doc_path}" not bare {doc_path}.
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assert.ok(
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loopBlock.includes('< "{doc_path}"') || loopBlock.includes("<\"{doc_path}\""),
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'shell redirections must quote {doc_path} to handle paths with spaces (#571)'
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);
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});
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test('corrupted doc is still re-verified (not silently skipped)', () => {
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// The restored doc must be included in step 2 re-verification so its
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// failures are counted and reported. It should only be excluded from
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// receiving another fix attempt, not from verification.
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const restoreIdx = loopBlock.indexOf('existing_content', loopBlock.indexOf('POST_FIX_LINES'));
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const reVerifyIdx = loopBlock.indexOf('re-verify', restoreIdx);
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assert.ok(
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reVerifyIdx !== -1,
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'fix_loop must include re-verification after truncation restore (corrupted docs still have failures) (#571)'
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);
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});
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});
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});
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@@ -61,6 +61,15 @@ const ALLOWLIST = new Set([
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'tests/prompt-injection-scan.test.cjs', // This file
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]);
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// Workflows that exceed the 50K strict-mode size threshold due to legitimate
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// complexity, but must still pass all injection pattern checks. These receive
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// a size-finding exemption only — every other security check still runs.
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// Do NOT add files here that legitimately reference injection patterns (those
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// belong in ALLOWLIST). Only add files that are large but otherwise clean.
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const SIZE_ONLY_WORKFLOWS = new Set([
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'get-shit-done/workflows/docs-update.md', // ~51K after fix-loop truncation guard (#571)
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]);
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// ─── Scanner ────────────────────────────────────────────────────────────────
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function collectFiles(dir) {
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@@ -167,8 +176,14 @@ describe('codebase prompt injection scan', () => {
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const content = fs.readFileSync(file, 'utf-8');
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const result = scanForInjection(content, { strict: true });
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if (!result.clean) {
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findings.push({ file: relPath, issues: result.findings });
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// SIZE_ONLY_WORKFLOWS entries still run injection scanning but are exempt
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// from the 50K size threshold — filter out only the size finding for them.
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const activeFindings = SIZE_ONLY_WORKFLOWS.has(relPath)
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? result.findings.filter(f => !f.startsWith('Suspicious text length:'))
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: result.findings;
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if (activeFindings.length > 0) {
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findings.push({ file: relPath, issues: activeFindings });
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}
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}
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