A setup skill for registering MCP servers on a live LiteLLM proxy. MCP, or Model Context Protocol, is a way for models and agents to connect to external tools and services.

Use it to register, list, or delete MCP servers using SSE, HTTP, or standard input/output connections.

It gathers the server connection details and authentication settings needed to make an MCP server available through the proxy.

add-mcp — Skill for Claude Code by BerriAI

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add BerriAI/litellm-skills --skill add-mcp

Clone the repo

git clone --depth 1 https://github.com/BerriAI/litellm-skills

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/berriai/litellm-skills/add-mcp/github.svg)](https://agentmods.dev/skills/berriai/litellm-skills/add-mcp)

Your own site

<a href="https://agentmods.dev/skills/berriai/litellm-skills/add-mcp"><img src="https://agentmods.dev/badge/skills/berriai/litellm-skills/add-mcp/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/berriai/litellm-skills/add-mcp"><img src="https://agentmods.dev/badge/skills/berriai/litellm-skills/add-mcp.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 43 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 490 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.00043	$0.00490
Opus 5	$0.00022	$0.00245
Sonnet 5	$0.00009	$0.00098
Haiku 4.5	$0.00004	$0.00049

Measured 11d ago against content hash acfffb1eb8c9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

add-mcp 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 11d 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.

compatibility: Requires curl.

add-mcp/SKILL.md · 71 lines

What it actually says

Add MCP Server

Setup

Ask for these if not already known:

LITELLM_BASE_URL  — e.g. https://my-proxy.example.com
LITELLM_API_KEY   — proxy admin key

API reference: https://docs.litellm.ai/docs/mcp

Ask the user

Server name (required, e.g. my-github-mcp)
URL (required, e.g. https://mcp.example.com/sse)
Transport — sse (default), http, or stdio
Description (optional)
Auth — does it need a bearer token or API key? (optional)

Run

curl -s -X POST "$BASE/v1/mcp/server" \
  -H "Authorization: Bearer $KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "server_name": "<name>",
    "url": "<url>",
    "transport": "sse",
    "description": "<description_or_omit>",
    "auth_type": "bearer_token",
    "credentials": "<token_if_needed>"
  }'

For unauthenticated servers, omit auth_type and credentials.

List existing MCP servers

curl -s "$BASE/v1/mcp/server" \
  -H "Authorization: Bearer $KEY"

Delete an MCP server

curl -s -X DELETE "$BASE/v1/mcp/server/<server_id>" \
  -H "Authorization: Bearer $KEY"

Output

Show server_id — needed to reference this MCP server in agent configs or to delete it later.

Changes

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.

11d ago First seen · 71 lines · 43 tokens per session scan A acfffb1eb8c9

Subscribe to this mod's changes

add-mcp is a skill published in the GitHub repository BerriAI/litellm-skills (84 stars, last pushed 4mo ago), licensed MIT. It adds 43 tokens to every session and 490 once invoked, about $0.0002 per session on Opus 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 2026-08-30.

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