MCP Server Builder
anthropics/skills
Guides the design and implementation of Model Context Protocol servers in TypeScript or Python, from tool naming and error messages to evaluation.
Prefer staticAssertUnreachable in the default branch of switches that must cover every variant of a union, so exhaustiveness is checked at compile time.
No licenceAuto-check passed
Install Exhaustive Switch
$ npx skills add zkldi/Tachi --skill exhaustive-switch -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install zkldi/Tachi exhaustive-switch --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/zkldi/Tachi.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .claude/skills/exhaustive-switch && 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 "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .claude/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switchType 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 zkldi/Tachi --skill exhaustive-switch -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install zkldi/Tachi exhaustive-switch --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zkldi/Tachi.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .agents/skills/exhaustive-switch && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .agents/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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 zkldi/Tachi --skill exhaustive-switch -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install zkldi/Tachi exhaustive-switch --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zkldi/Tachi.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .cursor/skills/exhaustive-switch && 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 "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .cursor/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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/zkldi/Tachi.git --path .cursor/skills/exhaustive-switch--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 zkldi/Tachi --skill exhaustive-switch -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install zkldi/Tachi exhaustive-switch --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zkldi/Tachi.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .gemini/skills/exhaustive-switch && 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 "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .gemini/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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 zkldi/Tachi exhaustive-switchInstalls 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 zkldi/Tachi --skill exhaustive-switch -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/zkldi/Tachi.git skills-src && mkdir -p .github/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .github/skills/exhaustive-switch && 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 "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .github/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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 zkldi/Tachi --skill exhaustive-switch -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install zkldi/Tachi exhaustive-switch --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/zkldi/Tachi.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.cursor/skills/exhaustive-switch .opencode/skills/exhaustive-switch && 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 "exhaustive-switch" agent skill from https://github.com/zkldi/Tachi/tree/main/.cursor/skills/exhaustive-switch into .opencode/skills/exhaustive-switch/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "exhaustive-switch", 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
exhaustive-switch- GitHub stars
- 238
- Token cost
- ~625 tokens
- SKILL.md length
- 265 words
- Files
- 1
- Skills in repo
- 5
- Repo updated
- First seen
- Licence
- None found
At a glance
Prefer staticAssertUnreachable in the default branch of switches that must cover every variant of a union, so exhaustiveness is checked at compile time.
- Works in 3 steps: Import staticAssertUnreachable from… → Bind the switched value in a variable if… → In default, call…
- Reviewing switch on discriminated unions
- SKILL.md covers When to use, Pattern, Why and Avoid, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Exhaustive Switch is an agent skill from zkldi/Tachi. Prefer staticAssertUnreachable in the default branch of switches that must cover every variant of a union, so exhaustiveness is checked at compile time. Use when writing or reviewing switch on discriminated unions, string literal unions, enums, or any switch meant to be exhaustive in the Tachi TypeScript server.
Its SKILL.md is about 630 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It works with TypeScript. The repository describes itself as: A Cutting-Edge, Modular Score Tracker.
When your agent uses it
- Reviewing switch on discriminated unions
- String literal unions
- Any switch meant to be exhaustive in the Tachi TypeScript server
Example prompts
- “/exhaustive-switch”
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Import staticAssertUnreachable from #utils/misc.js (server code).
- Bind the switched value in a variable if needed so the default branch receives a narrowed type.
- In default, call staticAssertUnreachable(discriminant) with the same value you are switching on (after all cases, TypeScript should infer…
What it can do on your machine
Read from SKILL.md and the folder at commit e6b34a1. 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 typescript).
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
Exhaustive Switch loads about 625 tokens when it runs. Until then it costs about 83 tokens; SKILL.md has 265 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
Without a licence we can't republish the file, so here is its outline and opening line. It has 265 words (~625 tokens).
“Use this pattern when the switch is meant to be exhaustive: every value of the discriminant type should have a case, and adding a new variant later should cause a TypeScript error until a new case is added.”
- name
- exhaustive-switch
Files
Just SKILL.md in .cursor/skills/exhaustive-switch of zkldi/Tachi.
Open the folder on GitHubat commit e6b34a1
Compare with similar skills
Exhaustive Switch 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 |
|---|---|---|---|---|---|---|
| Exhaustive Switch this skillzkldi/Tachi | 238 | — | ~625 | Automated safety check: Pass | None | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Web Artifacts Builderanthropics/skills | 180k | 40 repos | ~769 | Automated safety check: Pass | Apache-2.0 | |
| Typescript Advanced Typesrolling-scopes/rsschool-app | 10k | 25 repos | ~4.2k | Automated safety check: Pass | MPL-2.0 | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 4 repos | ~1.1k | Automated safety check: Pass | MIT | |
| MCP Server BuildershareAI-lab/learn-claude-code | 78k | 4 repos | ~1.2k | Automated safety check: Pass | MIT |
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Code Review Checklist
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Nx Import
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Import, merge, or combine repositories into an Nx workspace using nx import.
More from zkldi/Tachi
Actions And Pg Migration
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Patterns for writing actions (MakeAction/MakeAnonAction), using the Postgres DB (Kysely), and migrating Express routes from MongoDB to Postgres in the Tachi server.
Coverage Tools
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Aggregates Vitest v8/Istanbul coverage across Tachi workspaces via tachi-coverage-tools (manifest, CLI, optional programmatic API).
DB Formats
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Guidance on using db-formats/ column lists (SELECT) and document mappers (ToDocument) instead of selectAll() when writing Postgres-backed endpoints in the Tachi server.
Preserve Comments
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Preserves existing code comments (line, block, JSDoc, region markers) when editing files; does not delete or collapse comments for brevity unless the user asked to remove or update them.
Related
Works with
Questions about Exhaustive Switch
What does Exhaustive Switch do?
Prefer staticAssertUnreachable in the default branch of switches that must cover every variant of a union, so exhaustiveness is checked at compile time. Exhaustive Switch is an agent skill from zkldi/Tachi. Prefer staticAssertUnreachable in the default branch of switches that must cover every variant of a union, so exhaustiveness is checked at compile time.
When should I use Exhaustive Switch?
Exhaustive Switch fits situations like: reviewing switch on discriminated unions; string literal unions; any switch meant to be exhaustive in the Tachi TypeScript server.
How do I install Exhaustive Switch in Claude Code?
Run `npx skills add zkldi/Tachi --skill exhaustive-switch -a claude-code`. Or copy the skill folder (.cursor/skills/exhaustive-switch in zkldi/Tachi) into .claude/skills/exhaustive-switch in your project. Claude Code loads it when a task matches its description.
How do I install Exhaustive Switch in Codex?
Run `npx skills add zkldi/Tachi --skill exhaustive-switch -a codex`. Or copy the skill folder (.cursor/skills/exhaustive-switch in zkldi/Tachi) into .agents/skills/exhaustive-switch in your project. Codex loads it when a task matches its description.
Can I use Exhaustive Switch 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 zkldi/Tachi --skill exhaustive-switch -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/exhaustive-switch, .gemini/skills/exhaustive-switch, .github/skills/exhaustive-switch and .opencode/skills/exhaustive-switch in your project.
What does Exhaustive Switch need to run?
SKILL.md names no scripts, command-line tools or credentials: Exhaustive Switch is instructions for the agent only.
Does Exhaustive Switch 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 Exhaustive Switch 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 Exhaustive Switch use?
No licence was found for Exhaustive Switch or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Exhaustive Switch use?
About 625 tokens (SKILL.md is roughly 2.5k 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 Exhaustive Switch?
Skills that share tags, products or a category with Exhaustive Switch: MCP Server Builder (anthropics/skills, 180k stars), Web Artifacts Builder (anthropics/skills, 180k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Exhaustive Switch?
zkldi (a GitHub user) maintains it in zkldi/Tachi, which has 238 GitHub stars. The repository holds 5 skills in this directory. The repository was last updated on October 8, 2026.
Source: zkldi/Tachi on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.