Fystack agent skills

Agent skills that teach AI coding assistants (Claude Code, Cursor, Codex, Gemini CLI, GitHub Copilot and others that support the Agent Skills format) how to build on Fystack.

Skills

fystack: build on Fystack from any language. It covers:

• the REST API: an endpoint map, plus request signing with HMAC or Ed25519
• the official TypeScript (@fystack/sdk) and Go (github.com/fystack/platform-sdk-go) SDKs
• webhook verification
• the product model: workspaces, roles, approval groups, policies, Gas Station, sweeps and alerts. This lets it answer setup questions as well as write code.

It also builds in guardrails for custody code: sandbox first, no secrets in code, and no bypassing human approval of funds.

The skill stays small and points the agent at the live docs (https://docs.fystack.io/llms.txt and the Markdown version of every page), so it does not go stale when the API changes.

Install

Any agent, with the skills CLI:

npx skills add fystack/agent-skills

Claude Code, as a plugin:

/plugin marketplace add fystack/agent-skills
/plugin install fystack@fystack

Manually: copy skills/fystack/ into your agent's skills folder, for example .claude/skills/fystack/ in your project or ~/.claude/skills/fystack/ for all projects.

Try it

After installing, ask your assistant something like:

• "Create an MPC wallet in the Fystack sandbox and print its EVM deposit address."
• "Add an Express endpoint that receives Fystack webhooks, verifies the signature and credits confirmed deposits once."
• "Write a Python client for the Fystack API that signs requests with our Ed25519 key."
• "How do we set it up so withdrawals over $10k need 2 of 3 finance approvers?"

Layout

skills/fystack/
├── SKILL.md                    # workflow, core facts, guardrails, doc map
└── references/
    ├── api.md                  # every REST endpoint with key fields and statuses
    ├── authentication.md       # request signing in TypeScript, Python and Go
    ├── concepts.md             # workspaces, roles, approval groups, policies, ops features
    ├── webhooks.md             # signature verification and safe event handling
    ├── sdk.md                  # @fystack/sdk (TypeScript) surface and known doc drift
    └── sdk-go.md               # platform-sdk-go (Go) surface
.claude-plugin/marketplace.json # Claude Code plugin marketplace entry

evals/ holds the test prompts and pass/fail checks used to measure the skill against an agent without it.

Contributing

Keep SKILL.md short and link to the docs for details. When the API or an SDK changes, update the facts here and in the docs together.

License

MIT