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kin MCP Server Security Report

firelock-ai/kin

The system of record for AI-written software. A persistent graph of entities, relationships, changes, and provenance, so humans and AI agents see what a change touches before it merges. Beside Git today.

Security Trust Score
Grade B · Moderate posture
Tier 1 · Public sourceHigh confidence · 85%latest vmain@320cf57 Repository
Declared MCP capabilities
ToolsResourcesPrompts

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The short answer

Is kin safe to use?
kin scores 87/100 (grade B) on the Canopii Trust Index — good, minor gaps. It passes 14 of the 20 security controls that apply to it, with no confirmed security failures.
How reliable is the security score for kin?
We could evaluate 85% of the controls that apply to kin. Scores are deterministic — the same source always produces the same score — and a partially-scannable server cannot present a high one, because confidence caps the result. The scanner is open source, so this score can be reproduced independently.
How was kin scored?
Its published source was scanned against a fixed catalog of weighted security controls covering code safety, committed secrets, dependency vulnerabilities, tool-description integrity, authentication and transport, and maintenance. A confirmed flaw caps the score outright regardless of what else passes. The full rubric is published.
Reputation45stars5forks12open issues42d agolast commit<1yage

Security controlslatest scored version vmain@320cf57

Each control is evaluated deterministically with evidence. The score is earned from passing controls; a failed guard caps it.

Model–MCP Runtime Guardrails

  • Pass
    Strict JSON Schema EnforcementadditionalProperties:false present

    Tool inputs are constrained (additionalProperties:false), so unexpected arguments can't be smuggled in.

  • Not checked
    Indirect Prompt Injection (IPI) Defensesguardno tools extracted

    Tool/prompt/resource text is free of hidden instructions that could hijack the agent.

  • Not checked
    User-in-the-Loop / Approval Scopeguardno tools extracted

    No over-broad or destructive tools (arbitrary shell, bulk-delete) that warrant human approval.

  • N/A
    Tool Definition Integrityguardno prior version to diff

    Every consecutive version pair is diffed for new injection markers or destructive scope — a risky diff anywhere in history is a rug-pull (fail, durable); benign description drift warns.

Application Security Checks

  • Warn
    No path traversalguard29 occurrences

    Naive path checks let tools read/write outside intended directories (EscapeRoute-class).

    packages/boundary-contracts/src/index.js:77packages/kin-mcp/src/index.js:20packages/kin/lib/provision.mjs:217scripts/check-kin-vfs-compat.mjs:101

    Fix: Resolve to a canonical path and verify containment; reject ../ and symlinks.

  • Warn
    No SSRF sinksguard4 occurrences

    Fetching tool-supplied URLs can pivot into internal networks and metadata services.

    packages/kin-mcp/src/index.js:482packages/kin-mcp/src/index.js:495scripts/publish-boundary-contracts.mjs:56scripts/verify_installer_parity.py:128

    Fix: Allow-list destinations; reject arbitrary/loopback/link-local URLs.

  • Warn
    No known-vulnerable dependencies4 of 715 runtime deps vulnerable; worst medium

    Runtime dependencies (parsed from the lockfile) are scanned against OSV.dev for published CVEs. Advisory: flagged dependencies lower the score but don't hard-cap it, since transitive reachability is unproven.

    [email protected] — RUSTSEC-2025-0141[email protected] — RUSTSEC-2024-0436[email protected] — RUSTSEC-2026-0173[email protected] — RUSTSEC-2026-0194

    Fix: Upgrade the flagged dependencies past their fixed versions.

  • Pass
    No command-injection sinksguardno sinks found

    Untrusted tool input reaching a shell yields remote code execution.

  • Pass
    No dynamic code executionguardno sinks found

    eval()/exec()/Function() on tool-derived strings allows arbitrary code execution.

  • Pass
    No unsafe deserializationguardno sinks found

    pickle/yaml.load/etc. on untrusted data can execute code.

  • Pass
    No committed secretsguardno secrets found

    Hardcoded keys/tokens in published source are live credentials an attacker can use.

  • Pass
    Credentials sourced from environmentreads credentials from environment

    Reading secrets from env/secret stores avoids hardcoding them.

  • Pass
    Dependencies pinned (lockfile)lockfile present

    A lockfile makes installs reproducible and resistant to silent dependency swaps.

  • Pass
    Actively maintainedrecent commits

    Unmaintained servers don't receive security fixes.

  • Pass
    Repository not archivedguardactive

    Archived repositories will never be patched.

  • Pass
    Declares a licenseApache-2.0

    A clear license is required for legal enterprise use.

  • Pass
    Has a security policySECURITY.md present

    A SECURITY.md gives a private path to report vulnerabilities.

  • Pass
    Adoption & popularityestablished adoption

    A small, capped nudge from stars/downloads — widely-used servers get more eyes on bugs. It can never offset a real security failure.

  • Not checked
    Signed releasesnot evaluated

    Signed releases let consumers verify artifacts weren't tampered with.

  • N/A
    No install/post-install scriptsguardno published package

    install hooks run arbitrary code on every consumer at install time.

  • N/A
    Package name not typosquattingguardno published package

    Names mimicking popular packages are a common malware delivery vector.

  • N/A
    Published with provenanceno published package

    Build provenance attests the artifact was built from the claimed source by CI.

  • N/A
    Established maintainerno published package

    Brand-new / single anonymous maintainers raise takeover and malware risk.

Transport & Trust Model

  • Pass
    Execution Sandboxingcontainerized

    A container/sandbox image limits blast radius; a server that runs natively has full host access.

  • Pass
    Network Exposureno bind-all detected

    Binding 0.0.0.0 or exposing debug inspectors widens the attack surface.

  • N/A
    Transport Encryption (TLS)guardno remote endpoints

    Plaintext HTTP exposes traffic and bearer tokens to interception.

  • N/A
    IAM / Authentication Scopingno remote endpoints

    OAuth 2.1 / Protected Resource Metadata gates who can invoke tools.

  • N/A
    Live Endpoint Reachablenot dynamically scanned

    A dynamic scan connected to the declared remote endpoint and it responded — verified live, not a dead URL.

  • N/A
    Authentication Enforced (live)not dynamically scanned

    If the server declares auth is required, it must actually reject anonymous clients. Serving tools to unauthenticated callers is a real exposure.

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Versions

VersionScoreStatus
vmain@a1ea2a383Bscored
vmain@64174f383Bscored
vmain@a3f7ca083Bscored
vmain@50ffc5083Bscored
vmain@b1837fa83Bscored
vmain@a4ffb1d83Bscored
vmain@7f402ca83Bscored
vmain@eb3214883Bscored
vmain@dff402f87Bscored
vmain@8ed989687Bscored
vmain@ab4661b87Bscored
vmain@4523c0e87Bscored
vmain@0b2d92887Bscored
vmain@170f1fe87Bscored
vmain@3d5b0cb87Bscored
vmain@edca35687Bscored
vmain@9ab6bd487Bscored
vmain@f3f8e7487Bscored
vmain@a1a345e87Bscored
vmain@6e4503887Bscored
vmain@57daf9587Bscored
vmain@64c7c8c87Bscored
vmain@320cf57latest87Bscored
vmain@ff28f1715Fscored
vmain@02694da15Fscored
vmain@81ab51a15Fscored

Wondering how this compares? The MCP Security Index tracks grade distribution, committed secrets, and missing authentication across the whole ecosystem, refreshed monthly.