Calllint MCP Server

Your agent can run tools faster than you can review them. CallLint is a pre-flight risk linter for MCP and agent-tool configs. It checks the blast radius before the tool runs: what each tool can read, write, execute, connect to, send, or mutate - then returns an evidence-backed verdict (SAFE / REVIEW / BLOCK / UNKNOWN) before your agent ever loads the server.

People connecting security tools to Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-08-25 · ★ 2 · #71 OF 182 MAINTAINED SECURITY · VERIFIED 2026-08-25

Apache-2.0 · TypeScript servers · how we verify → /methodology

01 · Install Calllint

Claude Code

claude mcp add calllint-calllint -- npx -y calllint-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "calllint-calllint": {
      "command": "npx",
      "args": [
        "-y",
        "calllint-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license Apache-2.0 - declared in the repository

npm package calllint-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.calllint is GitHub-verified and matches the repo owner

03 · What Calllint can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

Limitations (from the README)

CallLint sees configuration, not behavior. It can miss risks a server only reveals at runtime, and can flag surface that turns out benign. It depends on the tool metadata you provide being accurate, and a server can change after you approve it (use baseline / verify to catch that). It is heuristic: expect both false positives and false negatives, and treat REVIEW/BLOCK as the start of a review, not a complete threat

Latest releases

v1.8.0 · 2026-08-18

[1.8.0] - 2026-08-18 - Phase 2.4-B gate closure + Trust Index D1-D3 + R-9 backup · Added · Workstream T PR T0 + Workstream R §8.6 - the trajectory-readiness audit lands where it can · actually be delivered, and the…

v1.7.3 · 2026-07-22

A distribution-productionization patch. It cuts what accumulated on main after 1.7.2: · CallLint ingests its own MCP server and runs the first real claim reconcile · (dogfood), the embedded-distribution /…

v1.7.2 · 2026-07-21

Distribution breadth, telemetry wiring & CI/scale-out hygiene. A hardening + plumbing · patch. No change to scan behaviour, the ScanReport schema, or the verdict vocabulary - · the deterministic engine is unchanged…

04 · Who maintains Calllint

calllint is maintained by calllint. It's the only MCP server we track from this author; the repo dates to Jun 2026.

05 · Facts

repository: github.com/calllint/calllint
website: https://calllint.com/
category: security - ranked #71 of 182 actively-maintained security servers as of 2026-08-25.
release cadence: 10+ releases in the last 90 days (latest 2026-08-18)
registry: io.github.calllint/calllint (active, first published 2026-06-30 · 2 versions)
packages: npm:calllint-mcp

06 · Calllint FAQ

What is Calllint?

Is Calllint still maintained?

Yes - as of 2026-08-25, its last commit was 2026-08-25 and it shipped 10+ releases in the last 90 days. We re-verify nightly.

How do I install Calllint?

Run `npx -y calllint-mcp`. You can also paste the ready-made client config above.

Does Calllint run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Calllint

Alternatives to Calllint

Maintained security servers if Calllint isn't the fit.

Pairs well with

Servers that cover what Calllint doesn't - only shown when the pairing reason fits the companion.

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