Isabelle-mcp (lucienwang1009/Isabelle-mcp) is an MCP server listed on the M8ven Trust Index. It scores 69 out of 100, grade C. It declares 19 tools. No publisher has claimed this listing.

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C
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69/100

Isabelle-mcp

→ lucienwang1009/Isabelle-mcp· listed on github_code

Limited view. Automated analysis covers part of this stack. Findings reflect what we verified. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.

Limited view: static analysis for Python is partially covered.

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Who stands behind it

lucienwang1009

Source: github_code

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GitHub

The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.

// key findings
✅
No credential exfiltration, no sensitive file access, no obfuscation
Static analysis found nothing flowing your secrets to unexpected places.
// environment variables
To run this server yourself, you supply these values. They go in your own MCP client configuration and stay on your machine. The secret label means the value is sensitive, not that the server mishandles it.
configISABELLE_HOMEexport =/path/to/Isabelle2025-2(.app) # dir containing bin/isabelle
configISABELLE_MCP_PORTI/R daemon TCP port (default 9147; if the default is busy the server auto-falls back to a free port, so a stale daemon no longer wedges startup)
configISABELLE_MCP_NO_BASH_SERVER1 Disable sledgehammer's ATPs (faster start)
configISABELLE_MCP_SESSIONIsabelle session image (default HOL)
configISABELLE_MCP_DISABLED_TOOLSComma-separated tool names to hide
configISABELLE_MCP_LOG_LEVELLog level for the JSON logs
configISABELLE_MCP_TRANSPORTDefault is stdio. Set =streamable-http (or sse) to
configISABELLE_MCP_EXPOSE_ADVANCED(+ isabelle_thm_deps when =1).
configISABELLE_MCP_AFP_INDEX_DBLocal AFP source index path (default ~/.cache/isabelle-mcp/afp-index.sqlite3)
configISABELLE_MCP_HOSTserve over HTTP on (default 127.0.0.1) /
configISABELLE_MCP_ALLOW_ML1 Allow raw Isabelle/ML commands (ML, ML_file, setup, ...); disabled by default
configISABELLE_MCP_MAX_TIMEOUT_SPer-call timeout ceiling (default 600)
configISABELLE_MCP_PORT_LOCK
configISABELLE_MCP_REPL_TTL_SIdle-REPL TTL before reaping (default 1800)
configISABELLE_MCP_ALLOWED_DIRSExtra allow-list roots for incidental reads (path-separated). Note: paths you pass explicitly to check_project/check_file/file_outline are trusted and need no entry here
configISABELLE_MCP_MAX_PREVIEW_CHARSOutput truncation (default 4000)
configISABELLE_MCP_PORT_HTTP(default 8000); a Prometheus GET /metrics endpoint
// quality suggestions

Tool annotations

No tools have read-only/destructive annotations

Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.

All four hints declared on every tool

19/19 tools missing one or more hints — isabelle_file_outline (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); isabelle_check_file (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); isabelle_check_project (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +16 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.

For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.

Tool handlers catch errors

Only 0/19 tool handlers wrap calls in try/catch (0%)

Wrap each tool handler body in try/catch and return a structured error response.

License file

No license file

Add a LICENSE file (MIT, Apache-2.0, etc.).

Tests exist

No test files found

Add tests that exercise each declared tool.

Claim the listing to review these findings one by one and send us a correction where you disagree, straight to the team. Claiming also means we tell you when the grade moves, and reach you first if we find anything urgent.

// full audit trail
The findings above are the summary. The full trail, every check we ran, each deduction, the network hosts observed and the dependency advisories, goes to verified publishers, along with an alert whenever a new one lands. Verified publishers can also review each finding and dispute it in one click. Publisher corrections have sharpened several of our checks this month, because the maintainer knows the codebase better than any scanner.
// improvement guidance — verified publishers only
We have 5 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.
// embed badge in your README
[![M8ven Score](https://m8ven.ai/badge/mcp/lucienwang1009/isabelle-mcp)](https://m8ven.ai/mcp/lucienwang1009/isabelle-mcp)
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commit: caef19db0f62368eb53c4d37d27961b26e9ec7b7
code hash: d59659529b8486ad4d4f9b7a01215a9c4b35de827c332d3ac8f36b1ee4a70280
view raw JSON →
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