mandoc-fix

name	mandoc-fix
description	Drive a mandoc rendering-bug fix end-to-end — scope the bug class, dispatch a subagent in the mandoc source tree, validate via /eval-render audit + compare, and decide whether to promote. Use when the user has identified (or suspects) a class of `-T markdown` rendering bug and wants the full diagnose → fix → validate → promote cycle.
user_invocable	true

mandoc-fix

You orchestrate the recurring mandoc-fix cycle: scope a bug class, dispatch a fresh subagent in ~/dev/vibe/mandoc-1.14.6/ (or the configured tree), validate the result with the existing render eval (audit for absolute check, compare for regression net), and decide promote / iterate / defer.

This skill calls /eval-render and /eval-llm as substeps — do not re-implement what they do.

Usage

/mandoc-fix <bug-description> [--rule <audit-rule>] [--pages <file>] [--mandoc-worktree <path>]

Arguments

• bug-description (required): Free-text description of the bug class, written so a subagent in the mandoc tree can understand it without prior context. Include a roff repro if possible.
• rule (optional): One of the audit rule ids (quad_star_run, empty_emphasis_tag, roff_named_escape, roff_two_letter_escape, roff_font_escape, visible_zwnj_entity, visible_nbsp_entity, visible_double_amp, giant_markdown_line, synopsis_no_spaces_run). When provided, the rule's count over the corpus is the load-bearing acceptance metric. When omitted, ask the user which rule (or rules) define success — guess only if the bug-description maps unambiguously to one rule.
• pages (optional): Path to a file listing repo-relative manpage paths affected by the bug (one per line). When provided, the absolute baseline is rendered against this list specifically; otherwise the standard tests/evals/render/corpus.txt is used.
• mandoc-worktree (optional): Path to the mandoc source tree. Defaults to /home/idank/dev/vibe/mandoc-1.14.6/.

Step 1: Scope

Confirm what's being measured before you spend any agent time. Show the user:

• The audit rule that will gate promotion.
• The page set the rule will be applied to (corpus vs --pages file, with row count).
• The current mandoc HEAD commit and the binary md5 of tools/mandoc-md so they know what "baseline" means.

If the user gave a free-text bug-description without a rule, name one and ask them to confirm. If neither a rule nor --pages makes the success metric concrete, stop and ask. Don't dispatch the subagent without a measurable target.

Step 2: Capture absolute baseline

Render the chosen page set with the current tools/mandoc-md, then audit:

source .venv/bin/activate
# Standard corpus
python tests/evals/render/render_eval.py render --label baseline-<rule> --mandoc tools/mandoc-md
# OR custom page list
python tests/evals/render/render_eval.py render --label baseline-<rule> --mandoc tools/mandoc-md $(cat <pages-file>)
python tests/evals/render/render_eval.py audit <run-dir> --rules <rule>

Record the rule's pages × occurrences baseline number. This is what the candidate must beat.

Step 3: Dispatch subagent

Use the templates/subagent-brief.md template. Fill in every placeholder. Spawn a fresh general-purpose agent (the mandoc tree is a separate working directory; the subagent will operate there).

Brief the agent not to push or promote — those are your job after validation.

Wait for the subagent to return before continuing. Run it foreground (default), not background — the validation steps depend on its output.

Step 4: Validate (three layers)

After the subagent reports a commit + rebuilt binary:

a. Absolute check (load-bearing). Render the same page set with the candidate; audit; compare counts to the baseline. Target: rule's pages × occurrences strictly down. Acceptable residue is content-driven (e.g. literal * in source roff); the subagent's report should distinguish.

b. Regression net. Invoke /eval-render <candidate-binary> to run the standard compare. Read the verdict. Suspicious deltas unrelated to the targeted rule are regressions.

c. Spot-check. Render and visually diff 2–3 of the most-affected pages from the baseline, confirming the fix matches the subagent's repro and doesn't introduce new visual artifacts.

Step 5: Apply the rubric

• merge ⇢ absolute count strictly down, /eval-render verdict is merge, spot-checks clean. Recommend: cp <candidate> tools/mandoc-md, commit referencing the upstream commit hash, suggest /eval-llm and re-extraction of the affected pages.
• regression ⇢ any layer fails. Re-dispatch the subagent (Step 3) with a delta brief that names the specific regression and concrete acceptance test. Re-iterate until merge or defer.
• defer ⇢ ambiguous cases (e.g. absolute count drops but /eval-render flags structural changes). Surface evidence to the user and ask.

Step 6: Promote and propose downstream

On merge:

cp <candidate-binary> tools/mandoc-md
git add tools/mandoc-md
git commit -m "feat(tools): promote mandoc-md with <one-line summary>

Picks up mandoc <upstream-commit> (\"<upstream-subject>\"). <impact line>.
<rule> drops from <baseline> to <candidate> across the <page-set>."

Then propose (don't run without explicit go-ahead):

1. /eval-llm as a sanity check that cleaner markdown doesn't perturb extraction quality.
2. Re-extract the affected pages with --reason populated:

   python -m explainshell.manager extract --mode llm:<model> --overwrite \
     -j 10 --reason "<one-line: what fixed, eval verdict>" \
     $(tr '\n' ' ' < <pages-file>)
   

3. Upload the live DB with make upload-live-db once the user confirms the re-extract looked clean.

Reporting back

Final user-facing report (in chat, not a file):

• One-line verdict.
• Baseline → candidate counts for the gating rule, with pages × occurrences.
• /eval-render aggregate verdict (one line).
• Spot-checked pages (one bullet each, before → after).
• If merge: the promotion commands above, ready to run.
• If regression: the redispatched subagent prompt fenced and ready.
• If defer: the specific evidence and a concrete question.

What NOT to do

• Don't dispatch a subagent without a measurable success metric (rule + page set).
• Don't promote without all three validation layers passing.
• Don't run /eval-llm, re-extract, or make upload-live-db without explicit user confirmation — those are downstream actions with cost or production impact.
• Don't push or merge changes in the mandoc tree from this session — the subagent commits in its own tree; the user pushes those upstream when they choose.