Code Design Rationale Investigator
cursor/plugins
Digs into why code is shaped the way it is by checking git history, pull requests and connected tools in parallel, then reporting a cited read on the tradeoffs.
Summarize a spec or current changes into a format suitable for sharing on Slack.
Install Summarize
$ npx skills add cashew-labs/libretto --skill summarize -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install cashew-labs/libretto summarize --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/summarize .claude/skills/summarize && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .claude/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarizeType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add cashew-labs/libretto --skill summarize -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install cashew-labs/libretto summarize --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/summarize .agents/skills/summarize && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .agents/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cashew-labs/libretto --skill summarize -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install cashew-labs/libretto summarize --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/summarize .cursor/skills/summarize && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .cursor/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/cashew-labs/libretto.git --path .agents/skills/summarize--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add cashew-labs/libretto --skill summarize -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install cashew-labs/libretto summarize --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/summarize .gemini/skills/summarize && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .gemini/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install cashew-labs/libretto summarizeInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add cashew-labs/libretto --skill summarize -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/summarize .github/skills/summarize && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .github/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add cashew-labs/libretto --skill summarize -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install cashew-labs/libretto summarize --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/cashew-labs/libretto.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/summarize .opencode/skills/summarize && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "summarize" agent skill from https://github.com/cashew-labs/libretto/tree/main/.agents/skills/summarize into .opencode/skills/summarize/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "summarize", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
summarize- GitHub stars
- 904
- Token cost
- ~233 tokens
- SKILL.md length
- 83 words
- Files
- 1
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- MIT
At a glance
Summarize a spec or current changes into a format suitable for sharing on Slack.
- Creating a summary for team communication
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Summarize is an agent skill from cashew-labs/libretto. Summarize a spec or current changes into a format suitable for sharing on Slack. Use when creating a summary for team communication.
Its SKILL.md is about 230 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development. It works with Slack. The repository describes itself as: The AI toolkit for building reliable browser automations. The licence is MIT.
When your agent uses it
- Creating a summary for team communication
Example prompts
- “/summarize”
What it can do on your machine
Read from SKILL.md and the folder at commit 41ab782. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Summarize loads about 233 tokens when it runs. Until then it costs about 36 tokens; SKILL.md has 83 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from cashew-labs/libretto at commit 41ab782, republished under its MIT licence (© cashew-labs). 83 words, ~233 tokens.
Download SKILL.mdSave it as
.claude/skills/summarize/SKILL.md (or your agent's skills folder).- name
- summarize
- description
- Summarize a spec or current changes into a format suitable for sharing on Slack. Use when creating a summary for team communication.
Summarize the given spec or current changes into a format suitable for sharing on Slack.
Read the spec file or use git diff to understand the current changes if no spec is provided.
Output the summary in this exact format:
**Problem:** Right now, we ...
- <bullet point explaining issue>
- <bullet point explaining issue>
- ...
**Solution:** <one sentence explaining the solution>
- <bullet point explaining change>
- <bullet point explaining change>
- ...Guidelines:
- Write concisely using active voice
- Focus on what matters to teammates who have no context
- Do not reference "this spec" or "this PR" - explain the problem and solution directly
- Keep bullet points short and scannable
- Use technical terms appropriately but avoid jargon
© cashew-labs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .agents/skills/summarize of cashew-labs/libretto.
Open the folder on GitHubat commit 41ab782
Compare with similar skills
Summarize next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Summarize this skillcashew-labs/libretto | 904 | — | ~233 | Automated safety check: Pass | MIT | |
| Code Design Rationale Investigatorcursor/plugins | 10k | 9 repos | ~2.6k | Automated safety check: Pass | None | |
| Release DigestKiln-AI/Kiln | 5.2k | — | ~2.7k | Automated safety check: Pass | Custom licence | |
| Pre Releaserusq/slackdump | 2.8k | — | ~841 | Automated safety check: Pass | AGPL-3.0 | |
| Dev Instanceyc-software/qm | 15k | — | ~3.7k | Automated safety check: Notes | MIT | |
| Releaseshaharia-lab/slackcli | 231 | — | ~1.9k | Automated safety check: Pass | MIT |
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Run the current worktree as a production-shaped local dev instance with web, Slack, or both, on a real LLM + Postgres.
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Related
Works with
Categories
Questions about Summarize
What does Summarize do?
Summarize a spec or current changes into a format suitable for sharing on Slack. Summarize is an agent skill from cashew-labs/libretto. Summarize a spec or current changes into a format suitable for sharing on Slack.
When should I use Summarize?
Summarize fits situations like: creating a summary for team communication.
How do I install Summarize in Claude Code?
Run `npx skills add cashew-labs/libretto --skill summarize -a claude-code`. Or copy the skill folder (.agents/skills/summarize in cashew-labs/libretto) into .claude/skills/summarize in your project. Claude Code loads it when a task matches its description.
How do I install Summarize in Codex?
Run `npx skills add cashew-labs/libretto --skill summarize -a codex`. Or copy the skill folder (.agents/skills/summarize in cashew-labs/libretto) into .agents/skills/summarize in your project. Codex loads it when a task matches its description.
Can I use Summarize in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add cashew-labs/libretto --skill summarize -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/summarize, .gemini/skills/summarize, .github/skills/summarize and .opencode/skills/summarize in your project.
What does Summarize need to run?
SKILL.md names no scripts, command-line tools or credentials: Summarize is instructions for the agent only.
Does Summarize access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Summarize safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Summarize use?
Summarize is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Summarize use?
About 233 tokens (SKILL.md is roughly 932 characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Summarize?
Skills that share tags, products or a category with Summarize: Code Design Rationale Investigator (cursor/plugins, 10k stars), Release Digest (Kiln-AI/Kiln, 5.2k stars), Pre Release (rusq/slackdump, 2.8k stars) and Dev Instance (yc-software/qm, 15k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Summarize?
cashew-labs (a GitHub organization) maintains it in cashew-labs/libretto, which has 904 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on August 21, 2026.
Source: cashew-labs/libretto on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.