Agent skill

Writing Common Lisp

by ultralisp in ultralisp/ultralisp

A skill your agent uses when creating or editing Common Lisp source files (.lisp/.asd) — setting up packages, declaring function types, choosing iteration/control-flow/condition constructs, or…

No licenceAuto-check passedDevelopment

Install Writing Common Lisp

skills CLI
$ npx skills add ultralisp/ultralisp --skill writing-common-lisp -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install ultralisp/ultralisp writing-common-lisp --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/ultralisp/ultralisp.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/writing-common-lisp .claude/skills/writing-common-lisp && rm -rf skills-src

Use ~/.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/

Facts

Skill name
writing-common-lisp
GitHub stars
258
Token cost
~1k tokens
SKILL.md length
417 words
Files
1
Skills in repo
14
Repo updated
First seen
Licence
None found

At a glance

A skill your agent uses when creating or editing Common Lisp source files (.lisp/.asd) — setting up packages, declaring function types, choosing iteration/control-flow/condition constructs, or…

  • Editing Common Lisp source files (.lisp/.asd) — setting up packages
  • SKILL.md covers Overview, When to Use, Package definition… and File layout, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Declaring function types

What it does

Writing Common Lisp is an agent skill from ultralisp/ultralisp. Use when creating or editing Common Lisp source files (.lisp/.asd) — setting up packages, declaring function types, choosing iteration/control-flow/condition constructs, or applying naming and formatting conventions in a Common Lisp project.

Its SKILL.md is about 1k 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. The repository describes itself as: The software behind a Ultralisp.org Common Lisp repository.

When your agent uses it

  • Editing Common Lisp source files (.lisp/.asd) — setting up packages
  • Declaring function types
  • Choosing iteration/control-flow/condition constructs
  • Applying naming and formatting conventions in a Common Lisp project

Example prompts

  • “/writing-common-lisp”

What it can do on your machine

Read from SKILL.md and the folder at commit 3439788. 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 (its code samples are lisp).

    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

Writing Common Lisp loads about 1k tokens when it runs. Until then it costs about 65 tokens; SKILL.md has 417 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~65
When it runs · the whole SKILL.md, loaded when a task matches
~1k

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

Without a licence we can't republish the file, so here is its outline and opening line. It has 417 words (~1,048 tokens).

“Conventions for new .lisp/.asd source in package-inferred ASDF systems: package definition, type declarations, control flow, conditions, and formatting. Apply across all CL projects in this workspace.”

— opening of SKILL.md by ultralisp
name
writing-common-lisp

Read the full SKILL.md on GitHub

Files

Just SKILL.md in .agents/skills/writing-common-lisp of ultralisp/ultralisp.

Open the folder on GitHubat commit 3439788

Compare with similar skills

Writing Common Lisp 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.

Writing Common Lisp compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Writing Common Lisp this skillultralisp/ultralisp258—~1kAutomated safety check: PassNone
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
Finishing a Development Branchobra/superpowers297k5 repos~1.9kAutomated safety check: PassMIT
Typescript Advanced Typesrolling-scopes/rsschool-app10k25 repos~4.2kAutomated safety check: PassMPL-2.0
PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Writing Common Lisp

What does Writing Common Lisp do?

A skill your agent uses when creating or editing Common Lisp source files (.lisp/.asd) — setting up packages, declaring function types, choosing iteration/control-flow/condition constructs, or…. Writing Common Lisp is an agent skill from ultralisp/ultralisp.asd) — setting up packages, declaring function types, choosing iteration/control-flow/condition constructs, or applying naming and formatting conventions in a Common Lisp project.

When should I use Writing Common Lisp?

Writing Common Lisp fits situations like: editing Common Lisp source files (.lisp/.asd) — setting up packages; declaring function types; choosing iteration/control-flow/condition constructs; applying naming and formatting conventions in a Common Lisp project.

How do I install Writing Common Lisp in Claude Code?

Run `npx skills add ultralisp/ultralisp --skill writing-common-lisp -a claude-code`. Or copy the skill folder (.agents/skills/writing-common-lisp in ultralisp/ultralisp) into .claude/skills/writing-common-lisp in your project. Claude Code loads it when a task matches its description.

How do I install Writing Common Lisp in Codex?

Run `npx skills add ultralisp/ultralisp --skill writing-common-lisp -a codex`. Or copy the skill folder (.agents/skills/writing-common-lisp in ultralisp/ultralisp) into .agents/skills/writing-common-lisp in your project. Codex loads it when a task matches its description.

Can I use Writing Common Lisp 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 ultralisp/ultralisp --skill writing-common-lisp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/writing-common-lisp, .gemini/skills/writing-common-lisp, .github/skills/writing-common-lisp and .opencode/skills/writing-common-lisp in your project.

What does Writing Common Lisp need to run?

SKILL.md names no scripts, command-line tools or credentials: Writing Common Lisp is instructions for the agent only.

Does Writing Common Lisp 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 Writing Common Lisp 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 Writing Common Lisp use?

No licence was found for Writing Common Lisp or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.

How many tokens does Writing Common Lisp use?

About 1k tokens (SKILL.md is roughly 4.2k 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 Writing Common Lisp?

Skills that share tags, products or a category with Writing Common Lisp: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Writing Common Lisp?

ultralisp (a GitHub organization) maintains it in ultralisp/ultralisp, which has 258 GitHub stars. The repository holds 14 skills in this directory. The repository was last updated on September 13, 2026.

Source: ultralisp/ultralisp on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.