Files
gstack/learn/SKILL.md.tmpl
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Garry Tanandcapy-ai[bot] 7204a39a27 v1.91.287.0 feat(write-skill): write, change and diet skills; /learn at half its template size (#3524)
* test(skill-evals): /learn before/after tasks, written before any cut (GSTA-133)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(learnings): --help, unknown-flag errors and --stats on the learnings bins; cross-project search no longer drops every project when the state root path contains the slug

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* refactor(learn): diet /learn onto the levels: tool flags replace the inline stats program, one mode table, prune rules kept

Skill-Diet: learn
Skill-Size: 5797→2586 bytes (SKILL.md.tmpl)
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* feat(write-skill): /write-skill skill, gstack-skill-bill, static skill-to-bin drift ratchet, shared skill eval contract

Skill-Size: 0→3245 bytes (write-skill/SKILL.md.tmpl)
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(learn): guard the state-root lookup in Prune; re-measure the learn ceiling

Skill-Size: 2586→2707 bytes (learn/SKILL.md.tmpl)
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix: pre-landing review fixes (drift scanner, learnings flags, skill-bill baselines, eval fixtures)

- skill-bin-drift: a redirect no longer ends a command, so `bin/x 2>/dev/null --bogus` is checked
- gstack-learnings-search: a missing value or a non-positive --limit exits 2 like an unknown flag
- gstack-skill-bill: the gstack root skill is a checkout skill; Skill-Diet trailers match the exact name; the baseline counts the committed bytes untrimmed
- skill-evals task files get a free contract test and are registered in FREE_FIXTURES, with the drift allowlist
- learn eval: the no-code-change safety task no longer asks the model to fix code (its check penalised obeying the user)

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(learn,write-skill): full bin paths in the mode table; prune asks per entry unless the request names the action

Skill-Diet: learn
Skill-Size: 2707→2955 bytes (learn/SKILL.md.tmpl)
Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* docs(changelog): /write-skill, gstack-skill-bill, drift ratchet, eval contract, /learn diet

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* docs: drift ratchet in CONTRIBUTING's static tests; /learn prune example asks per entry

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(skill-bill): report a checkout skill's eval task file and check it against the contract

The skill-evals task-file test now exercises lib/skill-bill.ts's checkEvalTasks, with a negative control, instead of a test-only validator (test-of-test ratchet).

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(skill-bill): EVAL TASKS path uses forward slashes on every platform; a non-object task entry is a problem, not a crash

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

* fix(learn): BASH_COMPAT guard on in-window heredocs; count skill-e2e-write-skill in the paid census

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

---------

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
2026-10-28 02:58:29 +00:00

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---
name: learn
preamble-tier: 2
version: 1.1.0
description: |
Manage project learnings. Review, search, prune, and export what gstack
has learned across sessions. Use when asked to "what have we learned",
"show learnings", "prune stale learnings", or "export learnings".
Proactively suggest when the user asks about past patterns or wonders
"didn't we fix this before?"
triggers:
- show learnings
- what have we learned
- manage project learnings
allowed-tools:
- Bash
- Read
- Write
- Edit
- AskUserQuestion
- Glob
- Grep
---
{{PREAMBLE}}
# /learn: project learnings
**Hard gate:** manage learnings only. Make no code changes, even when a learning names a fix.
`gstack-learnings-search` reads this project's learnings (latest entry per key+type); `gstack-learnings-log`
appends one. Both live in `~/.claude/skills/gstack/bin/` and take `--help`. Pick the mode from the request:
| Request | Run | Then |
|---|---|---|
| show (default) | `~/.claude/skills/gstack/bin/gstack-learnings-search --limit 20` | group by type; if empty, say none are recorded yet and that /review, /ship, /investigate and other skills record them as they work |
| search | `~/.claude/skills/gstack/bin/gstack-learnings-search --query "<words>" --limit 20` | show the matches |
| other projects | add `--cross-project` | only user-stated learnings from other projects appear |
| stats | `~/.claude/skills/gstack/bin/gstack-learnings-search --stats` | show the counts as a table |
| export | `~/.claude/skills/gstack/bin/gstack-learnings-search --limit 50` | a `## Project Learnings` section, `### <Type>s` per type, lines `- **key**: insight (confidence: N/10)`; show it, and write it into CLAUDE.md or a file only if the user asks |
| add | `~/.claude/skills/gstack/bin/gstack-learnings-log '<json>'` | ask only for what is missing: type, kebab-case key, one-sentence insight, confidence 1-10, files; `"source":"user-stated"` |
| prune | `~/.claude/skills/gstack/bin/gstack-learnings-search --limit 100` | see Prune |
## Prune
Flag each learning that is:
- **STALE**: a path in its `files` no longer exists in the repo.
- **CONFLICT**: the same key appears under two types with opposing insights (within one type the latest entry already wins).
For each flagged entry, ask: remove, keep, or update. Only a request that already names the action for these entries ("remove the stale ones without asking") answers it; never infer approval.
- Remove: delete its lines (that key and type) from the file this prints, leaving every other line as it is:
```bash
SLUG=$(~/.claude/skills/gstack/bin/gstack-slug --get SLUG)
GSTACK_STATE_ROOT=$(~/.claude/skills/gstack/bin/gstack-paths --get GSTACK_STATE_ROOT); : "${GSTACK_STATE_ROOT:?gstack-paths failed; reinstall with ./setup or /gstack-upgrade}"
echo "$GSTACK_STATE_ROOT/projects/$SLUG/learnings.jsonl"
```
- Update: log a corrected entry with the same key and type; the latest one wins.