Mythos Agent MCP Server

AI code-review assistant for application security. Open-source. Reads your code, flags likely security issues, explains its reasoning, suggests fixes. It runs locally over stdio via the published package.

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

VERIFIED ACTIVE

LAST COMMIT 2026-05-23 · ★ 41 · #96 OF 182 MAINTAINED SECURITY · VERIFIED 2026-08-25

MIT · TypeScript servers · how we verify → /methodology

01 · Install Mythos Agent

before you install - you'll need

The README does not document required environment variables for a basic install.

Claude Code

claude mcp add mythos-agent-mythos-agent -- npx -y mythos-agent

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "mythos-agent-mythos-agent": {
      "command": "npx",
      "args": [
        "-y",
        "mythos-agent"
      ]
    }
  }
}

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 MIT - declared in the repository

npm package mythos-agent - unscoped; check the name against the project README before installing

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

03 · What Mythos Agent can do

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

Latest releases

v4.3.0 · 2026-05-20

4.3.0 (2026-05-20) · Added · native OpenAI SDK code path + LLMClient abstraction (multi-model stage 2 partial) · wire LLMClient into recon/hypothesis/exploit agents (multi-model stage 2 complete)…

v4.2.0 · 2026-04-26

4.2.0 (2026-04-26) · Added · add baseURL for Anthropic-compatible proxies (multi-model stage 1)

v4.1.0 · 2026-04-26

4.1.0 (2026-04-26) · Added · add CVE replay harness with 5 real GHSA cases · redirect-headers: catch incomplete header strip on cross-host redirect · extract template literals + flag whitespace near interpolation · add…

04 · Who maintains Mythos Agent

mythos-agent is maintained by mythos-agent. It's the only MCP server we track from this author; the repo dates to Apr 2026.

05 · Facts

repository: github.com/mythos-agent/mythos-agent
category: security - ranked #96 of 182 actively-maintained security servers as of 2026-08-25.
registry: io.github.mythos-agent/mythos-agent (active, first published 2026-04-24)
packages: npm:mythos-agent

06 · Mythos Agent FAQ

What is Mythos Agent?

Is Mythos Agent still maintained?

Yes - as of 2026-08-25, its last commit was 2026-05-23. We re-verify nightly.

How do I install Mythos Agent?

Run `npx -y mythos-agent`. The README does not document required environment variables for a basic install. You can also paste the ready-made client config above.

Does Mythos Agent 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 Mythos Agent

Alternatives to Mythos Agent

Maintained security servers if Mythos Agent isn't the fit.

Pairs well with

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

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