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How to use MCP Slim Guard: what you can do with it

What is MCP Slim Guard? MCP Slim Guard is a TypeScript gateway that gives a host one guarded way to reach authorized upstream MCP tools, with schema-preserving compact modes and exact recovery of oversized results.

How do I use it? In the reviewed checkout, run npm ci, then npm run build, then npm link; then Change into your project directory and run mcp-slim-guard init, then mcp-slim-guard validate; edit mcp-slim-guard.yml so the tools allow and deny patterns match what Codex should reach. Full steps below.

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What do you want to do?

4 use cases

  • Give Codex a guarded, authorized MCP catalog

    Route Codex through Slim Guard in Native mode so it sees authorized tools with full schemas.

    View prompt
    Use the lennney/mcp-slim-guard repo to set up Native mode for Codex in the project at <project-path>. Run the plan and verify commands from the README and report the planned host entry. Confirm that `mcp-slim-guard verify --host codex` reports a configured runtime before you apply the install.

  • Recover oversized MCP results without re-running calls

    Use result_ref and read_result to pull exact pieces of a big tool response.

    View prompt
    In the lennney/mcp-slim-guard setup at <project-path>, trigger a tool call that returns a large result and capture its result_ref. Use read_result with a query to retrieve matching fragments, and confirm the fragments come from the same snapshot without a second upstream invocation.

  • Shrink first tool responses for Claude Code

    Use Extreme mode so large results arrive as a smaller first delivery that stays recoverable.

    View prompt
    For the lennney/mcp-slim-guard project at <project-path>, produce the Claude Code Extreme mode plan and show the host entry it would write. Then run one large tool call and confirm the first response is shorter than the exact response and includes a result_ref.

  • Measure mode trade-offs on your own MCP setup

    Run the bundled benchmarks and stress fixture to compare Native, Compact, and Extreme.

    View prompt
    In the lennney/mcp-slim-guard repo, run the build and the bench:task, bench:compression, and bench:stress scripts, then summarize the generated reports by mode. Verify that the report is produced locally and that you do not cite the older alpha figures as results.

Quick start with MCP Slim Guard

  1. Check you have what it needs: A reviewed checkout of the lennney/mcp-slim-guard repository (0.1.1-alpha.2 is not yet published to npm); npm to run ci, build, and link the package; A project directory that already has an MCP configuration.
  2. Open lennney/mcp-slim-guard on GitHub and read the README and license.
  3. In the reviewed checkout, run npm ci, then npm run build, then npm link.
  4. Change into your project directory and run mcp-slim-guard init, then mcp-slim-guard validate.
  5. Edit mcp-slim-guard.yml so the tools allow and deny patterns match what Codex should reach.
  6. Run mcp-slim-guard plan --host codex to review the host plan without changing host files.

These steps come from our top use case, Give Codex a guarded, authorized MCP catalog, which also has a copy-paste agent prompt.

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About this repo

  • Who it is forDevelopers who run Codex or Claude Code against MCP servers and want smaller tool surfaces or recoverable large results without repeating upstream calls.
  • Why it is hot182 stars, launched 87 days ago
  • LanguageTypeScript
  • Sourcegithub.com/lennney/mcp-slim-guard · Back to Hot repos

Requirements

  • A reviewed checkout of the lennney/mcp-slim-guard repository (0.1.1-alpha.2 is not yet published to npm)
  • npm to run ci, build, and link the package
  • A project directory that already has an MCP configuration
  • An upstream MCP server definition you are authorized to use

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Questions about MCP Slim Guard

What is MCP Slim Guard?

MCP Slim Guard is a TypeScript gateway that gives a host one guarded way to reach authorized upstream MCP tools, with schema-preserving compact modes and exact recovery of oversized results. It is an open-source project on GitHub: https://github.com/lennney/mcp-slim-guard.

How do I use MCP Slim Guard?

In the reviewed checkout, run npm ci, then npm run build, then npm link; then Change into your project directory and run mcp-slim-guard init, then mcp-slim-guard validate; edit mcp-slim-guard.yml so the tools allow and deny patterns match what Codex should reach. The use cases on this page give the full steps and a copy-paste agent prompt for each job.

Who is MCP Slim Guard for?

Developers who run Codex or Claude Code against MCP servers and want smaller tool surfaces or recoverable large results without repeating upstream calls.

What can I do with MCP Slim Guard?

4 use cases so far, for example: Give Codex a guarded, authorized MCP catalog; Recover oversized MCP results without re-running calls; Shrink first tool responses for Claude Code. Each has steps and a copy-paste agent prompt.

What do I need to run MCP Slim Guard?

A reviewed checkout of the lennney/mcp-slim-guard repository (0.1.1-alpha.2 is not yet published to npm); npm to run ci, build, and link the package; A project directory that already has an MCP configuration; An upstream MCP server definition you are authorized to use.

What are alternatives to MCP Slim Guard?

Other hot AI repos in Software and DevOps: Deep Infer, Harness2, Orca, Opencode, Graphify.

Is MCP Slim Guard safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.