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One MCP tool that returns the files a coding agent should read.
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CommunityJev Agents & MCP
Jevex — jimmyhealer
An MCP tool that answers what a coding agent should read: Jev scores a shortlist of files for a question like where session expiry is enforced, and the agent reads those ranges instead of grepping the tree. You still plan and patch; jevex is read-only.
- Stars
- 1
- Language
- Python
- License
- MIT
- Reading time
- 3 min
- Published by
- Community
- Author
- jimmyhealer
- Last verified
- Oct 2026
This is one of several Jev listings for the same project. The canonical entry is Jevex — jvsteiner.
Used inJev for Software & DevTools
- Languages
- Python
- Capabilities
- Open sourceRequires API key
Highlights
- Ships one MCP tool, codebase_investigate: it indexes a repo (py, ts, go, rs, md and more), asks Jev, and returns paths, symbols and line ranges worth reading.
- Author benchmark on n=16 SWE-bench Verified with agy + Gemini 3.8 Flash: mean time 160s to 69s, agent bill $8.74 to $3.13; patch file hit 16/16 in both arms.
- Under a 90s cap, 11/16 runs finished with jevex versus 1/16 without; a separate Claude Code fixture went from 6.8 to 2.2 files read (n=5).
- Needs a TypeSafe JEV_API_KEY for the Jev path;--no-jev is a lexical ablation without a key and is not the product, per the README.
- Jev costs about $0.0015 per question; jevex never patches and Jev never sees the whole repo, only the shortlist. MIT licensed.
Quickstart
bash
git clone https://github.com/jimmyhealer/jevex
cd jevex
pip install -e ".[mcp]"
claude mcp add jevex \
-e JEV_API_KEY=ts_... \
-e JEV_EXPLORER_REPO=/absolute/path/to/your/repo \
-- jevex-mcpWatch out
Copy reviewed against the full repo README on 2026-10-15. All performance numbers — 160s vs 69s, $8.74 vs $3.13, the 90s-cap completion rates — are the author's own benchmark on n=16 SWE-bench Verified, not independently verified.
Questions about this entry
Short answers drawn from the linked project or page.
jevex is an MCP server with one tool, codebase_investigate. Instead of grepping a tree, a coding agent asks a question like where session expiry is enforced, and Jev scores a shortlist of files and line ranges for the agent to read.
It indexes whatever a coding agent can already read (py, ts, go, rs, md and more), then has Jev rank a shortlist. The README stresses that jevex is not a second agent and not a jev_evaluate wrapper, and that Jev never sees the whole repo.
Clone the repository and run pip install -e ".[mcp]" in the checkout. For Claude Code, register it with claude mcp add jevex, passing JEV_API_KEY and JEV_EXPLORER_REPO as environment values; the README shows the exact command.
A TypeSafe JEV_API_KEY is required for the Jev path. The --no-jev flag runs a lexical ablation without a key, but the README says it is not the product. The repository is MIT licensed.
The author reports n=16 SWE-bench Verified with agy + Gemini 3.8 Flash: mean time 160s to 69s and agent bill $8.74 to $3.13, with 16/16 patch-file hits in both arms. Under a 90s cap, 11/16 jevex runs finished versus 1/16 without.
It is read-only and never patches: you still plan and patch, and jevex only answers what to read. It also keeps Jev away from the whole repository, exposing only the shortlist it scores.
The README positions it against Aider's repo map, Serena, the agent's own grep and OpenJev: jevex is index-then-ask, returning symbol-level ranges chosen by Jev rather than lexical hits. A separate Claude Code fixture went from 6.8 to 2.2 files read (n=5).
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