Isabelle MCP Server
isabelle-mcp
PyPI
v0.3.1
Published by xqyww123 — no publish provenance, so origin is unverified, but the source is public: the repository link below is self-declared yet readable, so you can inspect the code before adopting it.
The grade answers one question — how safe is this server for you to adopt — so it is computed in two auditable stages. Nothing below is an opinion or an LLM's guess; every line is a real term the deterministic engine applied, and the same input always yields the same number.
1. Threat score — 100 − 0 = 100. What the published surface and source actually contain:
The deterministic scan raised no scored threat in the surface it inspected — the threat score stayed at 100. Capability observations and advisory notes are recorded but never lower it.
2. Client adoption risk — 100 − 7 = 93. Three small, subtract-only factors that reflect your risk in adopting it — a clean scan proves less on a powerful, unverified or barely-inspectable package, so the grade says so plainly:
| Points | Adoption-risk factor |
|---|---|
| −6 | capability blast radius (high) — client exposure if the model is manipulated |
| −1 | publisher verification (public source) — no provenance, but the source is public and inspectable |
Capability observations and info notes are shown under Findings but never scored.
Open any row's finding below for the file, line and evidence behind a deduction.
Findings 5
high Shell/command execution in server code (src/isabelle_mcp/component.py)MTC-SRC-002
In the server's implementation (`src/isabelle_mcp/component.py:196`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: to edit.""" proc = subprocess.run( [c.isabelle, "components", op, path], capture_output=True, text=True, ti
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server src/isabelle_mcp/component.py
high Shell/command execution in server code (src/isabelle_mcp/install.py)MTC-SRC-002
In the server's implementation (`src/isabelle_mcp/install.py:48`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: tr) -> None: proc = subprocess.run(add_cmd) if proc.returncode != 0: _eprint(f"error: '{client} mcp add'
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server src/isabelle_mcp/install.py
high Shell/command execution in server code (src/isabelle_mcp/lsp_client.py)MTC-SRC-002
In the server's implementation (`src/isabelle_mcp/lsp_client.py:129`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: try: out = subprocess.run( ["isabelle", "version"], capture_output=True, te
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server src/isabelle_mcp/lsp_client.py
high Shell/command execution in server code (src/isabelle_mcp/utils/isabelle_symbols.py)MTC-SRC-002
In the server's implementation (`src/isabelle_mcp/utils/isabelle_symbols.py:130`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: YMBOLS``.""" home = os.popen("isabelle getenv -b ISABELLE_HOME").read().strip() home_user = os.popen("isabelle g
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server src/isabelle_mcp/utils/isabelle_symbols.py
low Shell/command execution in packaging/dev tooling (tests/test_component.py)MTC-SRC-002
In a packaging/dev/install script (shipped, but not the server runtime) (`tests/test_component.py:111`): Spawning a shell/process is command-execution capability; with unsanitized tool input it is command injection / RCE. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: (*args): return subprocess.run(["isabelle", *args], capture_output=True, text=True) def test_fresh_user(sel
Fix: Review this call path: confirm it never receives unsanitized tool input, constrain it, or remove it. Treat a server whose code reaches these sinks as high-capability regardless of what its tools claim.
Location: server tests/test_component.py
Tools 12
Each tool and what it can reach — statically extracted from the published source.
isabelle_cancel_evaluationno sensitive capabilityisabelle_command_outputno sensitive capabilityisabelle_definitionno sensitive capabilityisabelle_evaluate_tono sensitive capabilityisabelle_evaluation_statusno sensitive capabilityisabelle_find_theoremsno sensitive capabilityisabelle_goalno sensitive capabilityisabelle_hoverno sensitive capabilityisabelle_launchno sensitive capabilityisabelle_local_occurrencesno sensitive capability
Show 2 more tools ↓
isabelle_session_infono sensitive capabilityisabelle_terminateno sensitive capability
What this scan could not see
- Tools were statically extracted from the published source (12 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Versions 1
Scan history per published version. The engine is deterministic — the same version always yields the same score, so a changed score means the package itself changed.
| Version | Score | Findings | Engine | Scanned |
|---|---|---|---|---|
v0.3.1 latest |
A 93/100 | 5 | 1.9.0 | 2026-07-23 |
Embed this score
Show this server's live Trust Score in your README, docs or website. The badge is served straight from the registry and updates automatically after every rescan — no API key needed. It links back to this page, so anyone who sees the grade can also read the findings behind it instead of taking a number on faith.
Verify this score yourself
The score above is reproducible: the same package version always yields the same result. Run it locally or over the free API — no account, no LLM, fully deterministic.
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