Vellum Assistant is a personal AI assistant that remembers information about users, learns their preferences, and takes actions across connected apps. It is intended for people who want an assistant that can manage conversations, unfinished work, and proactive notifications over time. The catalogue skills, hooks, instruction, and setting configure or extend how the assistant works.
Borrowing it
Nothing to install: this file belongs to vellum-ai/vellum-assistant. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vellum-ai/vellum-assistant/main/.claude/skills/add-mcp-integration/SKILL.mdgit clone --depth 1 https://github.com/vellum-ai/vellum-assistantWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/vellum-ai/vellum-assistant/add-mcp-integration)<a href="https://agentmods.dev/skills/vellum-ai/vellum-assistant/add-mcp-integration"><img src="https://agentmods.dev/badge/skills/vellum-ai/vellum-assistant/add-mcp-integration/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/vellum-ai/vellum-assistant/add-mcp-integration"><img src="https://agentmods.dev/badge/skills/vellum-ai/vellum-assistant/add-mcp-integration.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00105 | $0.02676 |
| Opus 5.5 | $0.00042 | $0.01070 |
| Sonnet 5.5 | $0.00021 | $0.00535 |
| Haiku 4.5 | $0.00011 | $0.00268 |
Grade A, and why
add-mcp-integration scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 28d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
curl -sS -i -X POST "$URL" -H 'content-type: application/json' \ How it starts
The opening of the file, as written. The whole thing — 255 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Add an MCP Integration
A catalog integration is a bundled local plugin whose only content is an
mcp.json pointing at the vendor's remote server. The assistant ships it, the
Integrations page lists it, and connecting it runs the MCP OAuth flow in
assistant/src/mcp/mcp-oauth-provider.ts.
Scope: remote MCP servers in plugins/mcp-catalog/. For a full plugin that
lives in another GitHub repo, see plugins/README.md § Marketplace.
Work in a worktree from origin/main. One provider per PR.
1. Research the server
From the vendor's MCP docs, record:
- The remote URL. Prefer
streamable-http(docs often say"type": "http"). - The docs page URL. It is both
homepageanddocumentationUrl. - A one-line summary of what the tools do.
Reject a server that only runs locally (npx, uvx, Docker). The catalog
ships no stdio servers.
2. Check OAuth support
The catalog's one-step connect needs the server to support OAuth discovery and dynamic client registration (DCR), because a plugin cannot ship a client secret.
URL=https://mcp.example.com/mcp
curl -sS -i -X POST "$URL" -H 'content-type: application/json' \
-H 'accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2025-06-18","capabilities":{},"clientInfo":{"name":"probe","version":"0"}}}'
Expect 401 with WWW-Authenticate: Bearer ... resource_metadata="<url>".
Fetch that URL and take authorization_servers[0] as the issuer. Then fetch
the issuer's metadata from the first URL that answers, in the order the MCP
SDK tries them (buildDiscoveryUrls in @modelcontextprotocol/sdk
client/auth.js):
| Issuer | Metadata URLs, in order |
|---|---|
https://auth.example.com |
/.well-known/oauth-authorization-server, then /.well-known/openid-configuration |
https://auth.example.com/tenant1 |
/.well-known/oauth-authorization-server/tenant1, then /.well-known/openid-configuration/tenant1, then /tenant1/.well-known/openid-configuration (all on the issuer host) |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 28d ago First seen · 255 lines · 105 tokens per session scan A 07544c74ea22
add-mcp-integration is a skill published in the GitHub repository vellum-ai/vellum-assistant (1,448 stars, last pushed 2d ago), licensed MIT. It adds 105 tokens to every session and 2,676 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-25.
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