How do I install the Verify skill?

Run npx skillmds@latest add anthropics/verify-2 in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

What does the Verify skill do?

Build and drive the copilot-kit-ag-ui demo to verify changes end-to-end. It is listed under Coding & Dev Tools on SkillMD.

Is Verify safe to use?

This skill has not completed SkillMD's automated safety review yet. SkillMD never runs a skill's scripts for you; review the SKILL.md before installing.

Which AI agents work with Verify?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Verify free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Verify?

anthropics (@anthropics) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Verify by anthropics — Agent Skill

Name: Verify
Author: anthropics

File contents

Verifying changes to this demo

Build and drive the real server. npm run typecheck is CI's job, not evidence.

Without Anthropic credentials or provisioned agents

The server boots and serves everything except a live agent turn with stub IDs:

npm install && npm run build
ANTHROPIC_API_KEY=sk-ant-test ANTHROPIC_ENVIRONMENT_ID=env_x \
  ANTHROPIC_AGENT_ID=agent_x ANTHROPIC_AGENT_VERSION=1 PORT=8799 npm start

Probes that exercise the wiring:

GET :8799/ returns the built web/dist/index.html (there is no SPA catch-all, so unknown paths 404).
GET :8799/api/copilotkit/info lists the registered agents, confirming agent id and class registration without an API call.
POST :8799/api/copilotkit/agent/financial-assistant/run with an AG-UI body ({"threadId":"t1","runId":"r1","messages":[{"id":"m1","role":"user","content":"hi"}],"state":{},"tools":[],"context":[],"forwardedProps":{}}) reaches the AG-UI adapter and fails with a 401 from Anthropic. That 401 in the SSE RUN_ERROR proves the full route-to-SDK path.
CORS: send OPTIONS with an Origin header. With ALLOWED_ORIGINS set, allowed origins get Access-Control-Allow-Origin echoed and others get none.
VITE_COPILOT_RUNTIME_URL=... npm run build then grep web/dist/assets for the URL to confirm build-time baking.

With real credentials

npm run setup once, npm run dev, open http://localhost:5173, send a prompt that triggers a visual tool ("show me a growth projection for $500/month at 7%") and confirm the chart renders inline.

Gotchas

Boot requires agent identity: either agent-ids.json (from npm run setup) or the three ANTHROPIC_* ID env vars. Missing both is a deliberate boot failure.
Static serving only activates when web/dist exists, so run npm run build before npm start probes.

Frequently asked questions

Verify