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safe-fix-mcp

Un servidor MCP real que encuentra código muerto en un repositorio de Python y propone una rama + PR para la única clase de hallazgo que es realmente segura de eliminar automáticamente: importaciones no utilizadas en una línea de importación de un solo nombre. Todo lo demás que encuentra — funciones no utilizadas, clases, dependencias no utilizadas — permanece solo como informe. Un humano siempre hace el merge. Esta herramienta nunca hace merge de nada por sí misma.

Por qué existe esto

La mayoría de las herramientas de "código muerto" se detienen en el informe. Las que van más allá suelen eliminar sin red de seguridad. Esta no hace ninguna de las dos cosas: redacta un PR real, mínimo y revisable, condicionado a que la suite de pruebas completa del repositorio objetivo realmente pase después de la eliminación — no una heurística, sino una ejecución real de pytest. Si la suite falla, no se confirma ni se empuja nada; el repositorio queda exactamente como empezó.

Related MCP server: Python Code Guardian MCP Server

Herramientas

scan_dead_code(repo_path=".", min_confidence=60)

Solo lectura. Ejecuta vulture (código muerto) y deptry (problemas de dependencias) y devuelve una lista legible de hallazgos. Nunca modifica nada.

propose_removal_pr(repo_path=".")

  • Se niega si el árbol de trabajo está sucio — nunca edita sobre trabajo no confirmado.

  • Filtra a importaciones no utilizadas con ≥90% de confianza de vulture, solo en líneas de importación de un solo nombre (from x import y, z se omite — eliminar la línea completa eliminaría silenciosamente también z).

  • Crea una rama real, elimina las importaciones que califican, ejecuta la suite de pruebas completa real del repositorio.

  • Solo si pasa de verdad: confirma, empuja e intenta abrir un PR mediante gh pr create.

  • Si gh no está instalado/autenticado, la rama se confirma y se empuja de todos modos — solo la creación del PR se degrada, devolviendo el error real para que puedas abrirlo manualmente.

Instalación

pip install -e .

Añade a la configuración de tu cliente MCP (por ejemplo, Claude Code):

claude mcp add safe-fix-mcp -- safe-fix-mcp

O ejecuta directamente para pruebas locales:

python -m safe_fix_mcp.server

Requisitos

  • Python ≥ 3.10

  • git en PATH

  • gh (GitHub CLI) en PATH y autenticado, si quieres que propose_removal_pr realmente abra el PR — sin él, la rama igualmente se empuja de verdad, y la herramienta te indica que abras el PR manualmente.

Desarrollo

pip install -e ".[dev]"
pytest

Limitación conocida

vulture marca a scan_dead_code/propose_removal_pr como "no utilizados" — una clase conocida de falsos positivos, no un error real: se despachan mediante el decorador @mcp.tool() en tiempo de ejecución, no se llaman directamente en ningún lugar del código fuente, por lo que el análisis estático de grafos de llamadas no puede ver al llamador real (el propio framework MCP).

Verificación real

scripts/verify_real_client.py lanza el servidor empaquetado como un subproceso real y se comunica con él mediante el mcp.client.ClientSession real — el mismo camino que usa un cliente MCP real. Útil como prueba de humo después de cualquier cambio:

python scripts/verify_real_client.py

Available Tools

2 tools
propose_removal_prA

Propose a real branch+PR removing only unused imports (single-name import lines, >= 90% vulture confidence) from a Python repository. Runs the repo's own full test suite as a safety gate before ever committing or pushing — a failure there reverts everything and nothing is committed or pushed. If gh isn't available or PR creation otherwise fails, the branch is still committed and pushed for real; only the PR itself needs opening manually. A human always merges — this never merges anything itself.

repo_path: path to a real git repository with a clean working tree (uncommitted changes are refused, not overwritten).

ParametersJSON Schema
NameRequiredDescriptionDefault
repo_pathNo.

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A4.5/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description fully carries the behavioral burden, and it does so well. It explains that the test suite is a safety gate, that failures revert all changes, that branch commits/pushes persist if only PR creation fails, and that human merge is always required.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is somewhat long but every sentence earns its place, covering prerequisites, side effects, failure modes, and parameter meaning. The critical safety guarantees are front-loaded, and there is no filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a tool with one optional parameter and an output schema, the description is remarkably complete. It covers prerequisites, refused inputs, failure behavior, push semantics, and merge policy, so an agent has enough to call it correctly without additional context.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, but the description compensates by explaining repo_path as a real git repository with a clean working tree and noting uncommitted changes are refused. This adds meaningful semantics beyond the bare schema field, though it does not mention optionality/default behavior beyond what the schema already shows.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's specific action: propose a real branch and PR that removes unused imports from a Python repository. It adds precise scoping (single-name import lines, >=90% vulture confidence) that makes its purpose concrete and distinct from a general cleanup tool.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies usage context by specifying criteria for eligible imports and requiring a clean git repository with a full test suite. However, it never explicitly addresses when to use this tool versus scan_dead_code or mentions exclusions, leaving the routing partially to inference.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

scan_dead_codeA

Scan a Python repository for real dead code (vulture) and dependency issues (deptry). Read-only — never modifies anything. Returns a human-readable list of findings, or "No real candidates found."

repo_path: path to the repository to scan (must contain a pyproject.toml for the dependency checks to run; dead-code scanning works regardless). min_confidence: vulture's own confidence threshold (0-100). Lower values surface more candidates but more false positives.

ParametersJSON Schema
NameRequiredDescriptionDefault
repo_pathNo.
min_confidenceNo

Output Schema

ParametersJSON Schema
NameRequiredDescription
resultYes

TDQS

A4.6/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations present, the description carries full burden and does so well: it states the tool is read-only, never modifies anything, and describes the exact output (human-readable findings or 'No real candidates found.'). It also discloses the pyproject.toml dependency for deptry and explains the confidence threshold's trade-off. No annotation contradiction.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is compact—three sentences for behavior plus two parameter explanations—and all content earns its place, with read-only status front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a two-parameter tool with an output schema and a single sibling, this description covers input semantics, prerequisites, behavioral safety, and result format. The only omitted piece is explicit sibling differentiation, which belongs to usage guidelines. Combined with schema and output schema, an agent has everything needed to invoke it correctly.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 0% description coverage, and the description fills in all of it: repo_path is the path to the repository and must contain pyproject.toml for dependency checks, and min_confidence maps to vulture's 0-100 threshold with a false-positive trade-off. This goes well beyond the parameter names and defaults.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb-resource pair: scan a Python repository, and names the two tools (vulture, deptry) and the two classes of findings (dead code, dependency issues). This clearly distinguishes it from the sibling propose_removal_pr, whose action is proposing a PR, not scanning.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No explicit guidance on when to use this tool versus propose_removal_pr, nor any when-not conditions. However, the read-only declaration and human-readable output imply this is an analysis step, and the requirement about pyproject.toml provides some context. This makes usage predictable but not explicitly ruled for alternatives.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 2 tool updatesv0.1.2
    • First observedpropose_removal_pr
    • First observedscan_dead_code

TDQS

A4.4/5.0

Scored across 2 tools

Disambiguation5/5

scan_dead_code is purely read-only analysis, while propose_removal_pr actually creates a branch and PR. Their purposes are complementary and unlikely to be confused.

Naming Consistency4/5

Both tool names use lower_snake verb-first conventions: scan_dead_code and propose_removal_pr. The pattern is predictable, though the second name is slightly less clean because 'removal_pr' bundles an action and an object into one noun phrase.

Tool Count3/5

Two tools is on the thin side and sits at the borderline of feeling complete. However, each tool has a distinct role in a focused analyze-then-propose workflow, so the small count is plausible for a narrow server.

Completeness3/5

The scan surfaces both dead code and dependency issues, but propose_removal_pr only handles unused imports. Dependency fixes and non-import dead-code removals are therefore dead ends, creating a notable gap in the advertised safe-fix domain.

Maintenance

ActivitySlowing
ResponsivenessNo issues

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