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.
Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary.
Install Smithers Chain
$ npx skills add smithersai/smithers --skill smithers-chain -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install smithersai/smithers smithers-chain --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/smithersai/smithers.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/smithers-chain .claude/skills/smithers-chain && 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 "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .claude/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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/smithersai/smithers/tree/main/.agents/skills/smithers-chainType 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 smithersai/smithers --skill smithers-chain -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install smithersai/smithers smithers-chain --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/smithersai/smithers.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/smithers-chain .agents/skills/smithers-chain && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .agents/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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 smithersai/smithers --skill smithers-chain -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install smithersai/smithers smithers-chain --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/smithersai/smithers.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/smithers-chain .cursor/skills/smithers-chain && 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 "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .cursor/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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/smithersai/smithers.git --path .agents/skills/smithers-chain--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 smithersai/smithers --skill smithers-chain -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install smithersai/smithers smithers-chain --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/smithersai/smithers.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/smithers-chain .gemini/skills/smithers-chain && 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 "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .gemini/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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 smithersai/smithers smithers-chainInstalls 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 smithersai/smithers --skill smithers-chain -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/smithersai/smithers.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/smithers-chain .github/skills/smithers-chain && 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 "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .github/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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 smithersai/smithers --skill smithers-chain -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install smithersai/smithers smithers-chain --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/smithersai/smithers.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/smithers-chain .opencode/skills/smithers-chain && 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 "smithers-chain" agent skill from https://github.com/smithersai/smithers/tree/main/.agents/skills/smithers-chain into .opencode/skills/smithers-chain/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "smithers-chain", 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
smithers-chain- GitHub stars
- 430
- Token cost
- ~299 tokens
- SKILL.md length
- 149 words
- Files
- 1
- Skills in repo
- 9
- Repo updated
- First seen
- Licence
- MIT
At a glance
Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary.
- Agent Workflows work in your project
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Smithers Chain is an agent skill from smithersai/smithers. Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary.
Its SKILL.md is about 300 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 Agent Workflows. The repository describes itself as: Smithers is an agentic workflow framework for defining workflows in simple TypeScript configuration files and executing them quickly, durably, and reliably. The licence is MIT.
When your agent uses it
- Agent Workflows work in your project
Example prompts
- “/smithers-chain”
What it can do on your machine
Read from SKILL.md and the folder at commit b7f0898. 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
Smithers Chain loads about 299 tokens when it runs. Until then it costs about 28 tokens; SKILL.md has 149 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 smithersai/smithers at commit b7f0898, republished under its MIT licence (© smithersai). 149 words, ~299 tokens.
Download SKILL.mdSave it as
.claude/skills/smithers-chain/SKILL.md (or your agent's skills folder).- name
- smithers-chain
- description
- Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary.
Existing chain package
Read the chain README and its tests before changing this package. Keep the main product's single Agent.Service loop and @smthrs/flow authoring model; this skill is for the existing chain implementation, not a reason to add a second loop or graph API.
QuickJsRunner.layer() creates a sealed QuickJS realm per link with memory, stack, and step limits and no host globals. ScriptRunner.layerInProcess has no isolation and belongs only in trusted fixtures; a script there can reach process globals and dynamic imports.
The journal is the state authority. A matching settled call replays once, but a handler may execute again if it succeeded before CallSettled was recorded. Make external effects idempotent or give them an external durable key from the stable catalog call slot (chain, link, ordinal). Preserve the declaration/script identity checks that fail on replay divergence. Verify a crash after handler success and before settle when changing recovery.
© smithersai, 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/smithers-chain of smithersai/smithers.
Open the folder on GitHubat commit b7f0898
Compare with similar skills
Smithers Chain 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 |
|---|---|---|---|---|---|---|
| Smithers Chain this skillsmithersai/smithers | 430 | — | ~299 | Automated safety check: Pass | MIT | |
| MCP Server Builderanthropics/skills | 180k | 63 repos | ~2.3k | Automated safety check: Pass | Apache-2.0 | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 10 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Using Superpowersfarm-fe/farm | 5.6k | 35 repos | ~1.4k | Automated safety check: Pass | MIT | |
| Executing Plans Inlineobra/superpowers | 297k | 2 repos | ~5.1k | Automated safety check: Pass | MIT | |
| Skill CreatorAzure/azqr | 796 | 89 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 |
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Using Superpowers
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Executing Plans Inline
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Has the agent carry out an implementation plan itself, task by task in the current session, keeping a ledger, proving each step with a test and ending with one whole-branch review.
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More from smithersai/smithers
All 9 skills in this repoSmithers Durable Flow Driver
smithersai/smithers
Runs or authors Smithers TypeScript flows for ordered agent stages with retries, approvals, bounded loops and crash-safe recovery, built from Flow.make, Action.make and Effect.
Smithers Agent Runtime
smithersai/smithers
Guides changes to the Smithers agent loop's host wiring: credentialed model seats, budget accounting, sandbox limits and flow-call authorization.
Smithers Flow Registry Internals
smithersai/smithers
Documents how Smithers discovers and registers workflow flow files, so catalog listings stay metadata-only while running a flow loads its full body and action layers.
Smithers Repository Maintenance
smithersai/smithers
Points agents to the right sources when changing the Smithers workspace graph, generated docs, benchmark and eval evidence, or durable flows in the Smithers repository.
flows-jj ABI Maintenance
smithersai/smithers
Procedure for changing or verifying the flows-jj native and WASM ABI, its committed artifact and its reproducibility campaign in the Smithers repository.
Smithers Harness Detect
smithersai/smithers
Change local coding-harness discovery, account status, model flag detection, or version probes.
Related
Categories
Questions about Smithers Chain
What does Smithers Chain do?
Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary. Smithers Chain is an agent skill from smithersai/smithers. Maintain the existing @smthrs/chain runner, journal replay, catalog handlers, or sandbox boundary.
When should I use Smithers Chain?
Smithers Chain fits situations like: agent Workflows work in your project.
How do I install Smithers Chain in Claude Code?
Run `npx skills add smithersai/smithers --skill smithers-chain -a claude-code`. Or copy the skill folder (.agents/skills/smithers-chain in smithersai/smithers) into .claude/skills/smithers-chain in your project. Claude Code loads it when a task matches its description.
How do I install Smithers Chain in Codex?
Run `npx skills add smithersai/smithers --skill smithers-chain -a codex`. Or copy the skill folder (.agents/skills/smithers-chain in smithersai/smithers) into .agents/skills/smithers-chain in your project. Codex loads it when a task matches its description.
Can I use Smithers Chain 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 smithersai/smithers --skill smithers-chain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/smithers-chain, .gemini/skills/smithers-chain, .github/skills/smithers-chain and .opencode/skills/smithers-chain in your project.
What does Smithers Chain need to run?
SKILL.md names no scripts, command-line tools or credentials: Smithers Chain is instructions for the agent only.
Does Smithers Chain 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 Smithers Chain 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 Smithers Chain use?
Smithers Chain 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 Smithers Chain use?
About 299 tokens (SKILL.md is roughly 1.2k 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 Smithers Chain?
Skills that share tags, products or a category with Smithers Chain: MCP Server Builder (anthropics/skills, 180k stars), Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Using Superpowers (farm-fe/farm, 5.6k stars) and Executing Plans Inline (obra/superpowers, 297k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Smithers Chain?
smithersai (a GitHub organization) maintains it in smithersai/smithers, which has 430 GitHub stars. The repository holds 9 skills in this directory. The repository was last updated on October 10, 2026.
Source: smithersai/smithers on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.