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MCP Blast-Radius Auditor

Registre officiel Sécurité

Static blast-radius audit for MCP servers before agent install. Manifest optional.

Code source Site web Documentation

Que pouvez-vous faire avec MCP Blast-Radius Auditor ?

  • aos_compliance_validate — scan one MCP server directory (target_dir required; tool_id optional label)
  • aos_compliance_self_test — wiring smoke test

Installation

Ajoutez ceci à la configuration MCP de votre client (Claude Desktop : claude_desktop_config.json ; Cursor : .cursor/mcp.json ; VS Code et les autres utilisent la même forme « mcpServers »).

PYPI package mcp-blast-radius
Claude Code 
claude mcp add mcp-blast-radius-auditor -- uvx mcp-blast-radius==0.2.8
Configuration JSON (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mcp-blast-radius-auditor": {
            "command": "uvx",
            "args": [
                "mcp-blast-radius==0.2.8"
            ]
        }
    }
}

Documentation

Tirée du README du projet sur GitHub, actualisée chaque semaine. Les liens ouvrent GitHub.

Sommaire
  1. MCP Blast-Radius Auditor
  2. Try it in 3 steps
  3. Machine-readable metadata
  4. Example walkthrough
  5. Report a scan question
  6. 30-second scan
  7. Install
  8. CLI entry
  9. MCP tools
  10. What is extracted
  11. Environment
  12. Example
  13. License

MCP Blast-Radius Auditor

See what any MCP server can actually touch — before you add it to your agent.

No manifest? You still get the full blast-radius report. Add a manifest to also catch divergences.

Also, if the server declares a manifest: Catch an MCP server that touches files it said it wouldn't — and block the merge in CI.

Statically extract what a third-party MCP server can reach (files, network, subprocess, env) via surface-level analysis. Compare against declared boundaries when a manifest is present.

Scan scope (default): production package only — excludes tests/, docs/, examples/, scripts/, benchmarks/, .github/, and test_*.py patterns; JSON output includes scan_scope and excluded_file_count. Pass --include-peripheral to scan the full repo.

Try it in 3 steps

① Scan your server in one command

pip install mcp-blast-radius==0.2.5
mcp-blast-radius-gate --gate-mode advisory --target-dir /path/to/your-mcp-server

Point --target-dir at your shipping package root (e.g. src/). Default scope excludes tests, docs, and scripts.

② Read the JSON

FieldWhat it means
gate_passScan finished (advisory = report either way; blocking = exit 1 on divergences)
blocking_reasonsLines starting with DIVERGENCE: = declared vs. observed mismatch (if you ship a manifest)
blast_radiusStatic capability surface (network, subprocess, env, filesystem)
confidence labelsdeclared / observed-static / cannot-determine — static only, upper bounds

Undeclared capability is usually drift, not malice. Treat network/subprocess counts as upper bounds, not confirmed traffic.

③ Apply for an audit badge (optional, opt-in)

Ran a clean scan and want a signed README badge? Open a badge application — paste your command and JSON. Free, 90-day attestation, no phone-home. Criteria: BADGE_CRITERIA.md.

To verify any published attestation independently: pip install cryptography, then run packaging/scripts/verify_attestation.py (accepts local paths or HTTPS URLs). See BADGE_CRITERIA.md §Verify.

Machine-readable metadata

Example walkthrough

git clone --depth 1 https://github.com/oraios/serena.git /tmp/serena
mcp-blast-radius-gate --gate-mode advisory --target-dir /tmp/serena

Inspect blast_radius and any DIVERGENCE: lines in blocking_reasons.

Report a scan question

Open a GitHub issue with your JSON output (structured template loads automatically).

30-second scan

pip install mcp-blast-radius
mcp-blast-radius-gate --gate-mode blocking --target-dir /path/to/mcp-server

pipx run mcp-blast-radius starts the MCP stdio server (for Claude Desktop / Cursor). For CLI scanning, use mcp-blast-radius-gate as above.

  • Red (blocking): divergence detected — code touches paths or capabilities not declared in manifest.
  • Green: no divergences (or no manifest — blast radius report only, advisory pass).

Install

python3 -m venv .venv
source .venv/bin/activate
pip install .

CLI entry

mcp-blast-radius          # MCP stdio server
mcp-blast-radius-gate     # CI gate (default blocking, exit 1 on fail)
CI blocking gate
mcp-blast-radius-gate --gate-mode blocking --target-dir .
# no divergences → exit 0 / divergences or declaration violations → exit 1

MCP tools

  • aos_compliance_validate — scan one MCP server directory (target_dir required; tool_id optional label)
  • aos_compliance_self_test — wiring smoke test

Default gate_mode=advisory. Use gate_mode=blocking in CI to fail on divergences.

What is extracted

LayerScopeConfidence
Dependenciesrequirements.txt, pyproject.toml, package.jsondeclared
Python ASTimports, file I/O, network, env, subprocess; MCP tool attributionobserved-static / cannot-determine
Divergencemanifest permitted_output_paths / oracle_paths vs observed accessblocking when mismatch

Limitations: Static analysis only. Dynamic imports, getattr/eval, obfuscation, and native extensions may hide capabilities. We do not claim complete coverage — every finding includes a confidence label.

Environment

VariablePurpose
AOS_VALIDATOR_TARGET_DIRDefault scan root when target_dir is omitted
AOS_VALIDATOR_MCP_LOGJSONL path for local tool call log (never sent externally)
AOS_VALIDATOR_CALLERCaller label (ci, smoke_self_call, etc.)

Example

aos_compliance_validate target_dir=/path/to/my-mcp-server gate_mode=blocking

License

MIT

Questions fréquentes

Qu'est-ce que MCP Blast-Radius Auditor ?

Static blast-radius audit for MCP servers before agent install. Manifest optional.

Comment installer MCP Blast-Radius Auditor ?

Il s'exécute sur votre machine. Dans Claude Code : claude mcp add mcp-blast-radius-auditor -- uvx mcp-blast-radius==0.2.8. Pour les autres clients, collez la configuration JSON de cette page dans leurs réglages MCP.

Faut-il une clé API pour MCP Blast-Radius Auditor ?

Son entrée au registre n'indique aucune clé ni secret obligatoire. Certaines fonctions peuvent tout de même demander un compte auprès du service auquel il se connecte.

MCP Blast-Radius Auditor est-il open source ?

Oui. Son code est sur GitHub sous licence MIT.

Qui maintient MCP Blast-Radius Auditor ?

Il est publié par aos-standard. AI.tn le référence sans le maintenir ni le recommander.

Issu du registre MCP officiel. Être listé n'est pas une recommandation : vérifiez le code et les permissions d'un serveur avant de lui donner accès à vos données.