Jmunch MCP

Transparent MCP proxy that reduces the token cost of large upstream tool responses for nearly every other MCP server imaginable. Wraps a single upstream MCP, forwards every call, and handle-ifies fat payloads into content-aware backends the agent can query with a small set of universal verbs (peek, slice, search, aggregate, describe, list_handles).

People who work with Openai and Anthropic and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in Python.

VERIFIED ACTIVE

LAST COMMIT 2026-09-01 · ★ 33 · #238 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

MIT · Python servers · how we verify → /methodology

01 · Install Jmunch MCP

before you install - you'll need

Set OPENAI_API_BASE, ANTHROPIC_BASE_URL before connecting.

Claude Code

claude mcp add jgravelle-jmunch-mcp -- uvx jmunch-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "jgravelle-jmunch-mcp": {
      "command": "uvx",
      "args": [
        "jmunch-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 MIT - declared in the repository

pypi package jmunch-mcp - check the name against the project README before installing (PyPI has no namespace ownership)

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

03 · What Jmunch MCP can do

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

Latest releases

v0.2.3 · 2026-09-01

No functional change. Same code as v0.2.2, plus one HTML comment in the README. · Why this exists · jmunch-mcp is now listed in the MCP registry. Getting there required proving ownership of the PyPI name, which the…

v0.2.2 · 2026-09-01

Two fixes users can see. · _meta.cost_avoided was pricing two models wrong · The block stamped on every tool response overstated avoided cost by 3x for Claude Opus and 1.5x for Claude Sonnet. · claude_opus was priced…

v0.2.1 · 2026-04-30

Fixed · MCP tool names now use underscores (jmunch_peek etc.) instead of dots. · The Anthropic API enforces ^[a-zA-Z0-9_-]{1,64}$ on tool names server-side, so the previous dotted names produced 400s on every Claude…

04 · Who maintains Jmunch MCP

jmunch-mcp is maintained by jgravelle. We track 4 MCP servers from jgravelle - 4 actively maintained, 3,007 combined GitHub stars, oldest repo from Feb 2026. Full record: all servers from jgravelle.

  1. jCodemunch MCP Token-efficient code exploration via tree-sitter AST parsing. 70+ languages, 86-99% token savings. ★ 2,690
  2. jDocmunch MCP Section-level doc search for .md, .rst, .adoc, .ipynb, .html, .yaml, .json, and OpenAPI specs. ★ 203
  3. jDataMunch MCP Tabular data retrieval. Index CSV/Excel, query rows, aggregate. 99%+ savings vs raw file reads. ★ 81

05 · Facts

repository
github.com/jgravelle/jmunch-mcp
category
other - ranked #238 of 945 actively-maintained other servers as of 2026-09-18.
release cadence
2 releases in the last 90 days (latest 2026-09-01)
registry
io.github.jgravelle/jmunch-mcp (active, first published 2026-09-01)
packages
pypi:jmunch-mcp

06 · Jmunch MCP FAQ

What is Jmunch MCP?

Transparent MCP proxy that reduces the token cost of large upstream tool responses for nearly every other MCP server imaginable. Wraps a single upstream MCP, forwards every call, and handle-ifies fat payloads into content-aware backends the agent can query with a small set of universal verbs (peek, slice, search, aggregate, describe, list_handles).

Is Jmunch MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-01 and it shipped 2 releases in the last 90 days. We re-verify nightly.

How do I install Jmunch MCP?

Run `uvx jmunch-mcp`. The README documents 2 environment variables (OPENAI_API_BASE, ANTHROPIC_BASE_URL) to set first. Set OPENAI_API_BASE, ANTHROPIC_BASE_URL before connecting. You can also paste the ready-made client config above.

Does Jmunch MCP run locally?

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

07 · Alternatives to Jmunch MCP

Alternatives to Jmunch MCP

Maintained other servers if Jmunch MCP isn't the fit.

  1. Heyputer MCP Server Puter MCP enables AI tools to interact with Puter: manage files, websites, workers, and more ★ 43,552 · 2026-09-17
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  3. basebalance.cloud - x402 RPC & MCP gateway USDC-gated Base JSON-RPC: free 10 req/min, $0.50 per 10k. Failover, cache, /mcp, ledger. ★ 6,432 · 2026-08-26
  4. Zotero MCP (54yyyu) Search, read, annotate, and add to your Zotero research library, local or web. ★ 5,069 · 2026-09-15
  5. Firebase MCP Gives AI development tools Firebase-specific capabilities and expertise. ★ 4,470 · 2026-09-18
  6. Microsoft Fabric MCP Server MCP tools for interacting with Microsoft Fabric ★ 3,681 · 2026-09-17

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