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Search listings, message posters, and create draft posts on Capmus, the university marketplace
About
Search listings, message posters, and create draft posts on Capmus, the university marketplace
Remote endpoints: streamable-http: https://mcp.capmus.com/mcp
Security Report
10.0
Low Risk10.0Low RiskValid MCP server (3 strong, 1 medium validity signals). No known CVEs in dependencies. Imported from the Official MCP Registry.
6 tools verified · Open access · No issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
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This plugin requests these system permissions. Most are normal for its category.
How to Connect
Remote Plugin
No local installation needed. Your AI client connects to the remote endpoint directly.
Add this to your MCP configuration to connect:
{
"mcpServers": {
"io-github-capmus-team-capmus-mcp": {
"url": "https://mcp.capmus.com/mcp"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
supost-mcp
Remote MCP server for SUpost, the Stanford student marketplace. Lets AI agents search active listings, fetch listing details, and read verified market statistics.
This is doc 190 workstream E3 (see supost-web/docs/dev/190-ai-agent-discovery-implementation-plan.md).
It is a pure client of SUpost's public surfaces — the read-only listings
API (E2), public listing pages, and /stats.md. It has no privileged
database access and holds no secrets; the only configuration is the public
base URL.
Tools
| Tool | Backing surface | What it returns |
|---|---|---|
search_listings | GET /api/public/listings | Newest-first active listings (id, title, price, category, created_at, canonical URL) with opaque cursor pagination. Params: q, cat, university, max_price, limit (≤50), cursor. |
get_listing | GET /post/index/<id> → canonical listing page | One listing incl. full description, parsed from the page's schema.org Product JSON-LD. |
get_market_stats | GET /stats.md | The public stats page's markdown rendition (audience, listing volumes, response rates/times). |
send_message | POST /api/public/messages | Submits a message to a listing's poster. NOT delivered immediately: a confirmation link is emailed to reply_to_email, and the message only goes out after the human clicks it — agents must report it as pending confirmation, never sent. |
No personal information is ever returned. send_message is the supported
way to contact a poster; the listing's url also carries the on-site
message form. API terms:
https://supost.com/api/public/openapi.json.
Hosting
Deployed on Vercel as a stateless streamable-HTTP MCP endpoint
(mcp-handler +
@modelcontextprotocol/sdk):
https://mcp.supost.com/mcp (rewritten to /api/mcp)
No sessions, no Redis, no auth — every request is independently served and all upstream data is public and CDN-cached.
Deploy
vercel deploy # preview
vercel deploy --prod # production
Optional env var: SUPOST_BASE_URL (default https://supost.com; set to
https://preview.supost.com on preview deployments to point at the dev
stack).
Connect a client
claude mcp add --transport http supost https://mcp.supost.com/mcp
or in any MCP client that supports remote servers, add the URL above as a streamable-HTTP server.
Rate limiting
The public API enforces ~60 requests/minute/IP and serves 5-minute CDN
caching. The client in src/http.ts respects this: on a 429 it
honors Retry-After (capped at 5 s), retries once, and otherwise
surfaces a structured rate_limited error instructing the agent to back off
— it never retries in a loop. All requests carry a supost-mcp/… User-Agent.
Development
npm install
npm run check # typecheck + tests
SUPOST_BASE_URL=https://preview.supost.com npx tsx scripts/smoke.ts # live end-to-end
Tests (vitest) cover each tool's request/response mapping, error mapping, JSON-LD extraction, and the rate-limit contract (Retry-After honored, capped, single retry, structured failure).
Follow-ups (manual steps)
- Publish to the MCP registry — server.json is ready.
Make the repo public first (
gh repo edit Capmus-Team/supost-mcp --visibility public), then:sh brew install mcp-publisher mcp-publisher login github # device flow, needs a browser mcp-publisher publish # from the repo root -
/help/mcpdocs page in supost-web — PR #1242 (guide registry entry + llms.txt MCP line); live once merged to dev → master. - PR/citation announcement — draft and story beats in docs/announcement-draft.md; post after the registry listing and /help/mcp are live (doc 190 workstream F).
- E2 is live on production (
supost.com, 2026-07-09); smoke script verified against production, and the server is deployed athttps://mcp.supost.com/mcp.
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