Fixer MCP Server
@kajdep/mcp-fixer
npm
v1.1.0
Published by @kajdep — no publish provenance and no public repository, so the publisher could not be verified and the source cannot be independently located.
A comprehensive diagnostic and repair tool for Model Context Protocol (MCP) servers in Claude Desktop
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 − 1.2 = 99. What the published surface and source actually contain:
| Points | What was found | Category |
|---|---|---|
| −1.2 | Package runs install-time scripts MTC-SUP-010 | supply-chain |
2. Client adoption risk — 99 − 8 = 91. 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 |
| −2 | publisher verification (unlinked) — no provenance/repo link, but the shipped source was fully read |
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 4
high Shell/command execution in server code (src/index.js)MTC-SRC-002
In the server's implementation (`src/index.js:8`): 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: t { spawn, exec } from 'child_process'; import { promisify } from 'util'; import os from 'os'; const execAsync = promis
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/index.js
medium Dynamic module load from a non-literal (bin/mcp-fixer.js)MTC-SRC-005
In the server's implementation (`bin/mcp-fixer.js:101`): Loading a module chosen at runtime (from a variable) can pull in and run attacker-influenced code paths. This is read from the code itself — not from the tool description — so a poisoned server cannot hide it behind honest-looking metadata.
Evidence: fault: server } = await import(serverPath); await server.run(); } catch (error) { console.error(chalk.re
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 bin/mcp-fixer.js
low Shell/command execution in packaging/dev tooling (test/test.js)MTC-SRC-002
In a packaging/dev/install script (shipped, but not the server runtime) (`test/test.js:3`): 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: import { spawn } from 'child_process'; import { fileURLToPath } from 'url'; import path from 'path'; const __filename
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 test/test.js
low Package runs install-time scripts (postinstall)MTC-SUP-010
"@kajdep/mcp-fixer" executes postinstall script(s) at install time. An install hook runs at install time; most are routine build/setup, but review what it does before trusting it.
Evidence: echo 'Run \"npx mcp-fixer install\" to add to Claude Desktop'
Fix: Review the scripts; install with --ignore-scripts where possible and vet what they do.
Location: package @kajdep/mcp-fixer
Tools 7
Each tool and what it can reach — statically extracted from the published source.
check_mcp_server_statusno sensitive capabilitycheck_port_conflictsno sensitive capabilitydiagnose_mcp_configno sensitive capabilityfix_config_syntaxno sensitive capabilitygenerate_diagnostic_reportno sensitive capabilitysuggest_fixesno sensitive capabilityvalidate_dependenciesno sensitive capability
What this scan could not see
- Tools were statically extracted from the published source (7 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 |
|---|---|---|---|---|
v1.1.0 latest |
A 91/100 | 4 | 1.13.0 | 2026-09-07 |
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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