mcp-observatory

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MCP Observatory

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Secure the MCP servers you're building. MCP Observatory is the CI-native security tool for teams shipping custom MCP servers. Test during development, catch schema drift, simulate attacks, and generate compliance evidence — before agents depend on your servers.

Runtime enforcement: Use mcp-seatbelt to block dangerous MCP tool calls at runtime based on observatory scan results.

Get Started

npx @kryptosai/mcp-observatory demo

Scans your configured MCP servers (or a built-in demo server if you have none) and shows your safety grade in seconds. No config, no arguments — instant value.

Have servers? Scan them all:

npx @kryptosai/mcp-observatory

Test a specific server:

npx @kryptosai/mcp-observatory test npx -y @modelcontextprotocol/server-everything

Add CI + Code Scanning in one command:

npx @kryptosai/mcp-observatory setup-ci --all --command "npx -y my-mcp-server" --sarif --schedule weekly

Why MCP Observatory

MCP servers are becoming production dependencies. If agents rely on them, teams need a way to catch broken tools, unsafe schemas, schema drift, slow responses, and security footguns before those failures reach users.

Observatory gives maintainers and teams:

• One-command CI setup with setup-ci --all
• Profile-mapped audits with audit --profile nsa-mcp
• MCP receipts that package target, evidence, verdict, action, and reproduction commands
• MCP risk graphs that group servers by capability boundary, receipt state, CI posture, and recommended action
• Action receipts that say allow, gate, rerun, quarantine, or escalate
• GitHub PR comments for compatibility, drift, and security findings
• GitHub Code Scanning SARIF for normalized MCP findings
• Health score badges for public trust signals
• Record/replay/verify workflows for regression testing
• MCP server mode so agents can inspect other MCP servers directly
• Production support path for hosted history, private repo reporting, certification, support, and fleet visibility

See the launch page, GitHub Code Scanning for MCP servers, Code Scanning demo, target gallery, target registry, target contribution guide, MCP Observatory Contributors, Agent Task Pack, MCP Receipts, Tool-call receipts, MCP Risk Graph, setup-ci --doctor, MCP server security field guide, Safety Methodology, MCP Server Safety Index, June 2026 safety field report, reference evaluations, MCP lock files, public proof, campaign attribution, local metrics dashboard, open core boundary, MCP Attack Simulation Evidence Pack, Private MCP Fleet Risk Graph, and commercial support.

Self-Assessment

We scan ourselves with mcp-observatory on every release. See results →

For Security And Platform Teams

MCP servers are becoming part of the AI software supply chain. Agents need reliable, testable, auditable tools before those tools become dependencies in mission-critical workflows.

Whether you're shipping one MCP server or running a fleet, MCP Observatory gives you CI-native security scoring, attack simulation, schema drift detection, SARIF/HTML/Markdown reports, and GitHub Code Scanning — from your first npx command to production deployment. Local development stays free; teams running private repos, fleets, or compliance pipelines can upgrade through a paid MCP Readiness Review.

Production Support

Local OSS use stays free under MIT. Teams running MCP in production can use the Private MCP Fleet Risk Graph and MCP Attack Simulation Evidence Pack for safe-mode attack simulation, SARIF/Code Scanning setup, CI rollout, private evidence reporting, and owner-ready remediation notes. Private fleet risk graph pilots start at $50,000; attack simulation packages start at $15,000; narrow readiness reviews start at $2,500.

The open source repo is the public evidence engine. Private telemetry intelligence, company/account prioritization, commercial ranking weights, hosted fleet workflows, and buyer-specific evidence packs stay outside the OSS package; see the open core boundary.

Run npx @kryptosai/mcp-observatory cloud, open a pilot request from the issue chooser, or see COMMERCIAL.md. Also see privacy and telemetry, campaign attribution, and terms for production use.

How It Compares

Feature	mcp-observatory	Snyk agent-scan	Cisco mcp-scanner	agent-shield
MCP-native	✓	✓	✓	✓
Attack simulation	✓	✗	✗	✗
Schema drift detection	✓	✗	✗	✗
Record/replay/verify	✓	✗	✗	✗
Health scoring (0-100)	✓	✗	✗	✗
SARIF output	✓	✓	✓	✓
CI/CD native (setup-ci)	✓	✓	✓	✓
Safety index (17+ servers)	✓	✗	✗	✗
Runtime enforcement via mcp-seatbelt	✓	✗	✗	✗

Quick Start

Scan every MCP server in your Claude config:

npx @kryptosai/mcp-observatory

Go deeper — also invoke safe tools to verify they actually run:

npx @kryptosai/mcp-observatory scan deep

Test a specific server:

npx @kryptosai/mcp-observatory test npx -y @modelcontextprotocol/server-everything

Add it to Claude Code as an MCP server:

claude mcp add mcp-observatory -- npx -y @kryptosai/mcp-observatory serve

Or add it manually to your config:

{
  "mcpServers": {
    "mcp-observatory": {
      "command": "npx",
      "args": ["-y", "@kryptosai/mcp-observatory", "serve"]
    }
  }
}

Commands

Command	What it does
scan	Auto-discover servers, check them, and run safe attack-readiness simulation by default
scan deep	Scan, run safe attack simulation, and also invoke safe tools to verify they execute
test <cmd> / test --target <file>	Test one server and emit an action receipt by command or target config
record <cmd>	Record a server session to a cassette file for offline replay
replay <cassette>	Replay a cassette offline — no live server needed
verify <cassette> <cmd>	Verify a live server still matches a recorded cassette
diff <base> <head>	Compare two run artifacts for regressions and schema drift
watch <config>	Watch a server for changes, alert on regressions
suggest	Detect your stack and recommend MCP servers from the registry
serve	Start as an MCP server for AI agents
lock	Snapshot MCP server schemas into a lock file
lock verify	Verify live servers match the lock file
history	Show health score trends for your MCP servers
setup-ci / init-ci	Create a GitHub Action and badge snippet for MCP compatibility/security checks
setup-ci --sarif	Generate a workflow that uploads normalized findings to GitHub Code Scanning
setup-ci --doctor	Inspect whether the repository has a complete CI adoption kit
risk-graph --input <path>	Merge receipts and run artifacts into JSON, Markdown, and HTML MCP risk graphs
--no-attack-sim	Opt out of the default safe attack simulation on scan or test
ci-report	Generate CI report for GitHub issue creation
enterprise-report	Generate a static production/security report from run artifacts
score <cmd>	Score an MCP server's health (0-100)
badge <cmd>	Generate an SVG health score badge for README
cloud	Show hosted reporting, security review, and enterprise pilot options

Run with no arguments for an interactive menu:

What It Does

Check capabilities — connects to a server and verifies tools, prompts, and resources respond correctly.

Invoke tools — goes beyond listing. Actually calls safe tools (no required params / readOnlyHint) and reports which ones work and which ones crash.

npx @kryptosai/mcp-observatory scan deep

Detect schema drift — diffs two runs and surfaces added/removed fields, type changes, and breaking parameter changes.

npx @kryptosai/mcp-observatory diff run-a.json run-b.json

Recommend servers — scans your project for languages, frameworks, databases, and cloud providers, then cross-references the MCP registry to suggest servers you're missing.

npx @kryptosai/mcp-observatory suggest

Or ask your agent "what MCP servers should I add?" when running in MCP server mode.

Security scanning — analyzes tool schemas for dangerous patterns: shell injection surfaces, broad filesystem access, missing auth, and credential leakage in responses.

npx @kryptosai/mcp-observatory test --security npx -y my-mcp-server

Record / replay / verify — capture a live session, replay it offline in CI, and verify nothing changed. Like VCR for MCP.

# Record a session
npx @kryptosai/mcp-observatory record npx -y @modelcontextprotocol/server-everything

# Replay offline (no server needed)
npx @kryptosai/mcp-observatory replay .mcp-observatory/cassettes/latest.cassette.json

# Verify the live server still matches
npx @kryptosai/mcp-observatory verify cassette.json npx -y @modelcontextprotocol/server-everything

Watch for regressions — re-runs checks on an interval and alerts when something changes.

npx @kryptosai/mcp-observatory watch target.json

Scan locations

When you run scan, it looks for MCP configs in:

• ~/.claude.json (Claude Code)
• ~/Library/Application Support/Claude/claude_desktop_config.json (Claude Desktop, macOS)
• %APPDATA%/Claude/claude_desktop_config.json (Claude Desktop, Windows)
• .claude.json and .mcp.json (current directory)

Architecture

                    ┌─────────────────────────┐
                    │   MCP Observatory CLI    │
                    │  npx @kryptosai/mcp-     │
                    │     observatory scan     │
                    └───────────┬─────────────┘
                                │
                    ┌───────────▼─────────────┐
                    │   Config Discovery       │
                    │  (Claude, Cursor, etc.)  │
                    └───────────┬─────────────┘
                                │
              ┌─────────────────┼─────────────────┐
              ▼                 ▼                  ▼
    ┌─────────────────┐ ┌──────────────┐ ┌──────────────────┐
    │   Security Scan  │ │  Attack Sim  │ │  Schema Drift    │
    │  (shell, creds)  │ │ (tool poison)│ │  (version diff)  │
    └────────┬────────┘ └──────┬───────┘ └────────┬─────────┘
             │                 │                   │
             └─────────────────┼───────────────────┘
                               ▼
                    ┌─────────────────────┐
                    │   Health Score       │
                    │  (0-100 + verdict)   │
                    └──────────┬──────────┘
                               │
              ┌────────────────┼────────────────┐
              ▼                ▼                 ▼
    ┌──────────────┐  ┌──────────────┐  ┌──────────────┐
    │  SARIF       │  │  Markdown    │  │  CI Gateway  │
    │  (Code Scan) │  │  Report      │  │  (setup-ci)  │
    └──────────────┘  └──────────────┘  └──────────────┘

CI / GitHub Action

Add Observatory to your MCP server's CI pipeline:

npx @kryptosai/mcp-observatory setup-ci --all --command "npx -y my-mcp-server" --sarif --schedule weekly

Check the adoption kit:

npx @kryptosai/mcp-observatory setup-ci --doctor

Successful test, run, and single-target scan checks also offer to convert the passing result into a CI adoption kit. That automatic conversion enables SARIF/Code Scanning and weekly scheduled checks by default; pass --no-ci-sarif when you only want a conservative workflow without Code Scanning upload.

Or create the workflow manually:

# .github/workflows/observatory.yml
name: MCP Server Check
on: [pull_request]

permissions:
  contents: read

jobs:
  observatory:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: KryptosAI/mcp-observatory/action@v1.28.0
        with:
          command: npx -y my-mcp-server
          deep: true
          security: true
          comment-on-pr: false
          set-status: false

Action inputs:

Input	Description	Default
command	Server command to test	(required if no target)
target	Path to target config JSON
targets	Path to MCP config file for multi-server matrix scan
deep	Also invoke safe tools	false
security	Run security analysis	false
fail-on-regression	Fail the action on issues	true
fail-on-baseline-drift	Fail the action when baseline verification detects drift	true
comment-on-pr	Post report as PR comment. Requires pull-requests: write.	true
set-status	Set a commit status check (green/red) on the HEAD SHA. Requires statuses: write.	true
github-token	Token for PR comments and commit statuses	${{ github.token }}

The action can comment on PRs and set commit statuses when the workflow grants write permissions. setup-ci generates read-only third-party-friendly workflows by default and lets maintainers opt into comments/statuses later. init-ci remains available as a backward-compatible alias. See action/README.md for all options.

Production teams can add hosted CI history, private-repo reporting, recurring security reports, certification review, support, and fleet visibility. Run npx @kryptosai/mcp-observatory cloud, see COMMERCIAL.md, or open a pilot request from the issue chooser.

Certified by MCP Observatory

MCP server maintainers can add a public compatibility/security signal to their README:

[![MCP Observatory](https://img.shields.io/badge/MCP%20Observatory-enabled-2563eb)](https://github.com/KryptosAI/mcp-observatory)

Or generate a score badge from a live check:

npx @kryptosai/mcp-observatory badge npx -y my-mcp-server --output docs/mcp-health.svg

See the certification distribution loop for the GitHub Action template, maintainer PR body, and badge rollout playbook.

Generate a pilot-ready production/security report from local run artifacts:

npx @kryptosai/mcp-observatory enterprise-report \
  --account "Your Company" \
  --format html \
  --output observatory-enterprise-report.html

For clearer internal account attribution in CI, set:

MCP_OBSERVATORY_ORG=your-company.com
MCP_OBSERVATORY_CONTACT=your-team-contact

Testing Feishu/Lark integrations? See the Feishu/Lark MCP guide.

Lock Files

$ npx @kryptosai/mcp-observatory lock              # Snapshot all server schemas
$ npx @kryptosai/mcp-observatory lock verify        # Verify no drift since last lock

Lock files are the package-lock for AI tools: commit the MCP contract, then make every tool, schema, prompt, or resource drift visible in CI. See MCP lock files.

Trend Tracking

$ npx @kryptosai/mcp-observatory history            # Show health trends over time

Nightly Scans

$ npx @kryptosai/mcp-observatory ci-report          # Generate regression report for CI

MCP Server Mode

No other testing tool is itself an MCP server. Add Observatory as a server and your AI agent can autonomously test, diagnose, and monitor your other MCP servers.

claude mcp add mcp-observatory -- npx -y @kryptosai/mcp-observatory serve

Your agent gets 10 tools:

Tool	When to use it
scan	Check if all your configured MCP servers are healthy
check_server	Test a specific server before installing or after updating
score_server	Get a quick health score and grade for a server
record	Capture a baseline of a working server for future comparison
replay	Test against a recorded session — no live server needed
verify	Confirm a server update didn't break anything
watch	Check a server and see what changed since the last check
diff_runs	Find regressions between two check results
get_last_run	Retrieve previous check results for a server
suggest_servers	Discover MCP servers that match your project stack

An AI tool that checks other AI tools. It is a tool testing tools that serve tools.

Security

The MCP server runs inside AI hosts where an LLM chooses which tools to call. To prevent prompt-injection attacks:

• Command allowlist: Only npx, node, python, python3, uvx, docker, deno, bun are permitted as base executables. The CLI has no restrictions.
• Path validation: File-reading tools are constrained to the runs/cassettes directories.
• No arbitrary execution: Use the CLI for unrestricted commands.

CLI vs MCP: Intentional Differences

Feature	CLI	MCP Server	Why
watch	Polling loop	Single check + diff	Request/response doesn't support long-polling
Interactive menu	Arrow-key navigation	Not available	MCP has no interactive UI
Color output	--no-color flag	Always plain text	MCP returns structured content
report	Renders saved artifacts	Not available	Agents read artifacts directly
serve	Starts MCP server	N/A	Is the MCP server
run	Reads target config files	Inline params	MCP tools accept params directly
get_last_run	Not available (use ls + diff)	Available	Convenience for agents

Compatibility

Works with any MCP server that uses standard transports:

Transport	Examples	Adapter
stdio (most servers)	filesystem, memory, context7, brave-search, sentry, notion, stripe	local-process
HTTP/SSE (remote)	Cloudflare, Exa, Tavily	http
Docker	All @modelcontextprotocol/server-* images	local-process via docker run -i

Servers needing API keys work via env in the target config. Python servers work via uvx. See the full compatibility matrix for tested servers and known issues.

Target config files

For more control (env vars, metadata, custom timeout):

{
  "targetId": "filesystem-server",
  "adapter": "local-process",
  "command": "npx",
  "args": ["-y", "@modelcontextprotocol/server-filesystem", "."],
  "timeoutMs": 15000,
  "skipInvoke": false
}

npx @kryptosai/mcp-observatory run --target ./target.json

HTTP / SSE targets

{
  "targetId": "my-remote-server",
  "adapter": "http",
  "url": "https://mcp.example.com/mcp",
  "authToken": "${MCP_SERVER_TOKEN}",
  "headers": {
    "X-Api-Key": "$MCP_SERVER_API_KEY"
  },
  "timeoutMs": 15000
}

Target configs support ${VAR}, $VAR, and env:VAR references in authToken, headers, and local-process env values.

How It Compares

Feature	Observatory	mcp-recorder	MCPBench	mcp-jest
Auto-discover servers	✅	—	—	—
Check capabilities	✅	—	✅	✅
Invoke tools	✅	—	—	✅
Schema drift detection	✅	—	—	—
Record / replay	✅	✅	—	—
Verify against cassette	✅	—	—	—
Response snapshot diffs	✅	—	—	—
Benchmarking / latency	—	—	✅	—
Jest integration	—	—	—	✅
Works as MCP server	✅	—	—	—

Each tool has strengths. Observatory focuses on regression detection and CI-friendly workflows. mcp-recorder is great as a transparent proxy. MCPBench is the go-to for performance benchmarking. mcp-jest is ideal if you're already in a Jest workflow.

Prior Art

The record/replay/verify pattern is inspired by:

• VCR (Ruby) — pioneered cassette-based HTTP record/replay
• Polly.js (Netflix) — HTTP interaction recording for JavaScript
• mcp-recorder — MCP-specific traffic recording proxy
• MCPBench — MCP server benchmarking
• mcp-jest — Jest-style testing for MCP servers

Limitations

• Servers requiring interactive OAuth (e.g., Google Drive) need pre-authentication before Observatory can connect
• Custom WebSocket transports (e.g., BrowserTools MCP) are not supported
• A few servers time out or close before init — see known issues and compatibility

Works with mcp-seatbelt

Scan before you trust. Enforce at runtime with mcp-seatbelt — an MCP proxy that consumes Observatory receipts and blocks out-of-contract tool calls in production. Observatory validates; seatbelt enforces.

Works with agent-obs

Secure your servers with Observatory. Trace your agents with agent-obs — an open-source agent execution tracer that records every tool call, computes A-F session grades, and shows you exactly where your agents spend time, burn tokens, and hit errors. Observatory tells you if a server is safe. agent-obs tells you what your agent did with it. Free, local-first, npm install -g agent-obs.

Contributors ✨

Thanks to these amazing people who have contributed:

• leemeo3 — 3 Safety Index targets (Git, Chrome DevTools, Filesystem MCP)
• albatrossflyon-coder — GitHub MCP Safety Index (#201)
• tanishxdev — Legacy CLI deprecation warnings (#187)
• sansynx — CLI format validation (#182)

See all contributors →

Contributing

We welcome contributors! This project follows a Contributor Covenant Code of Conduct. The fastest way to get involved:

git clone https://github.com/KryptosAI/mcp-observatory.git && cd mcp-observatory && npm install && npm test

The most common first contribution is adding an MCP server to the Safety Index (10-15 minutes). See CONTRIBUTING.md for full guidelines, code standards, and the contributor recognition ladder.

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