@guardbee/mcp Security Proxy

GitHub Actions

MCP security gateway and LLM firewall: masks PII and secrets, blocks prompt injection and toxic flows (lethal trifecta), approves risky calls and keeps a hash-chained audit log, for MCP servers and LL

Devops Developer Tools Security

Add to Cursor Add to VS Code Run on PlugMCP

GitHub npm Website

Add to Cursor Add to VS Code Run on PlugMCP

1{2  "mcpServers": {3    "guardbee-mcp-security-proxy": {4      "command": "npx",5      "args": [6        "-y",7        "@guardbee/[email protected]"8      ]9    }10  }11}

.cursor/mcp.jsonMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Add to Cursor Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Local command

npx -y @guardbee/[email protected]

Claude Code has no install link for a local command. Copy the command below and run it in a terminal.

shClaude Code

1claude mcp add guardbee-mcp-security-proxy -- npx -y @guardbee/mcp-security-proxy@1.27.0

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "guardbee-mcp-security-proxy": {4      "command": "npx",5      "args": [6        "-y",7        "@guardbee/[email protected]"8      ]9    }10  }11}

claude_desktop_config.json

Local · npmPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
Version: 1.27.0
Last checked: 2026-10-27

Stars: —
Tools: —
Uptime: —

Overview

About @guardbee/mcp Security Proxy

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install @guardbee/mcp Security Proxy?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does @guardbee/mcp Security Proxy need an API key?

No required environment variable is listed on this record.

What transport does @guardbee/mcp Security Proxy use?

@guardbee/mcp Security Proxy runs locally over stdio.

When was @guardbee/mcp Security Proxy last checked?

Last checked 2026-10-27. MCP security gateway and LLM firewall: masks PII and secrets, blocks prompt injection and toxic flows (lethal trifecta), approves risky calls and keeps a hash-chained audit log, for MCP servers and LLM APIs

From the publisher

Documentation

GuardBee MCP

Security for AI agents and MCP. GuardBee puts a gateway between your agents and their tools and models that masks personal data and secrets, blocks prompt injection and toxic data flows, asks before risky calls and keeps a tamper-evident audit log, plus scanners that check your code and configs against the OWASP MCP Top 10. Open source (MIT), runs on your machine, no account needed.

# Put your existing MCP servers behind the gateway (backs up your client config first)
npx -y @guardbee/mcp-security-proxy@^1 init --client claude-desktop   # or cursor, claude-code

# Check a codebase against the OWASP MCP Top 10
npx -y @guardbee/mcp-owasp-scan scan . --fail-on=high

An agent calls a CRM through GuardBee: personal data is masked, a prompt injection is blocked, and sending data out after reading untrusted and sensitive content is refused

Run it yourself: examples/demo (npm install && npm start).

Which package should I use?

You want to…	Install	How
Protect agents at runtime: mask personal data, block injection and toxic flows, approve risky calls, keep an audit log	`@guardbee/mcp-security-proxy`	Put it in front of your MCP servers (`guardbee-proxy init` imports your client config)
Check a codebase against the OWASP MCP Top 10 in one pass, in CI	`@guardbee/mcp-owasp-scan`	`npx @guardbee/mcp-owasp-scan scan . --format=sarif --fail-on=high`
Give an agent many GuardBee checks from one MCP server	`@guardbee/security-suite`	`guardbee serve` (recommended set), `--tools=code,network` or `all`
Find leaked keys in files, git history or agent transcripts	`@guardbee/mcp-secret-scanner`	`npx @guardbee/mcp-secret-scanner scan . --history`
Audit the MCP servers configured on developer machines	`@guardbee/mcp-config-auditor`	`npx @guardbee/mcp-config-auditor discover`
Let an agent query a database without seeing raw personal data	`@guardbee/mcp-db-gateway`	Point it at your database with a policy
Use the detectors in your own code	`@guardbee/guard-core`	`import { maskPiiInText } from "@guardbee/guard-core"`

Every other package is a single check (one OWASP risk, one protocol, one file type); each is in security-suite too. npx @guardbee/security-suite list shows them with what they check.

Benchmarks

Detection is measured, not claimed: packages/pii-bench is a reproducible benchmark for Turkish and international personal data, with bootstrap 95% intervals and the datasets in the repo.

Benchmark	Result
Identifiers (TC Kimlik, IBAN, card, phone, e-mail, …), 400 documents + 160 clean	F1 97.1, recall 100%, false alarms on clean documents 8.1%, 0.04 ms per document
Person names with the optional NER model, same set	F1 99.5
Hand-written hard cases for names (tr-names-challenge)	F1 97.1, 0 false alarms
KVKK Art. 6 special categories with NER (tr-special-challenge)	F1 97.5, 0 false alarms
Bypass suite: 5 identifiers × 16 disguises (base64, hex, URL/HTML/`\u` escapes, other scripts' digits, separators)	80 / 80 masked, 0 of 16 look-alike strings changed

The identifier detectors were tuned after reading this set's misses, so the challenge sets are the fairer measure; the pii-bench README lists the limits. Any other detector can be run on the same data through its System interface.

Examples

Ready-to-copy proxy policies (minimal, KVKK, coding agent, LLM gateway), client configs for Claude Desktop, Claude Code, Cursor and VS Code, and CI templates for GitHub Actions and GitLab: examples/.

Packages

Package	npm	Description
`packages/ai-code-scanner`	`@guardbee/mcp-ai-code-scanner`	Scans a codebase for insecure LLM/AI integration patterns (client-exposed keys, unsafe output handling, excessive agency, PII→prompt, prompt injection)
`packages/compliance-checker`	`@guardbee/mcp-compliance-checker`	KVKK/GDPR/CCPA compliance checks
`packages/dependency-auditor`	`@guardbee/mcp-dependency-auditor`	CVE scanning for npm/pip/cargo dependencies (OSV)
`packages/dns-intelligence`	`@guardbee/mcp-dns-intelligence`	DNS record enumeration, misconfiguration and dangling-subdomain detection
`packages/db-gateway`	`@guardbee/mcp-db-gateway`	KVKK/GDPR-compliant gateway between an LLM and a database (PII masking, RBAC, rate limiting, queryable audit log; Prisma/Postgres/MySQL/SQLite/MongoDB adapters; optional insert/update/delete support)
`packages/mcp-server-auditor`	`@guardbee/mcp-server-auditor`	Scans other MCP servers' tool definitions for insecure patterns (excessive agency, shell/eval/SQL/SSRF sinks, loose schemas, hardcoded secrets, wildcard CORS)
`packages/prompt-injection-scanner`	`@guardbee/mcp-prompt-injection-scanner`	Scans RAG content/scraped pages for indirect prompt injection (instruction override, spoofed role/chat-template tokens, hidden text, "Dear AI" direct address, data-exfiltration instructions)
`packages/llm-redteam`	`@guardbee/mcp-llm-redteam`	Actively red-teams a live LLM endpoint/chatbot with canary-based jailbreak/extraction/obfuscation probes (OpenAI/Anthropic/webhook targets)
`packages/model-scanner`	`@guardbee/mcp-model-scanner`	Scans ML model files (PyTorch, pickle, safetensors, Keras/H5, ONNX) for supply-chain risks — dangerous pickle deserialization globals, disguised/malformed safetensors headers, Keras Lambda-layer RCE, ONNX external-data path traversal
`packages/reverse-shield`	`@guardbee/mcp-reverse-shield`	The defensive side of reverse-engineering MCPs: audits a shipped web build or live site, Electron app, Android APK or native/.NET binary for what an analyst gets for free — exposed source maps, missing minification/R8/.NET obfuscation, debug info and symbols, debuggable flags, Electron fuses, missing code signing, embedded keys; A–F grade
`packages/vector-store-scanner`	`@guardbee/mcp-vector-store-scanner`	Probes vector-database endpoints (Weaviate, Qdrant, Chroma, Elasticsearch/OpenSearch, Redis, Postgres/pgvector) for unauthenticated exposure of embeddings and RAG data
`packages/prompt-leak-scanner`	`@guardbee/mcp-prompt-leak-scanner`	Catches leaked credentials and PII (API keys, TC Kimlik No, credit cards, IBANs) in outbound LLM prompts — as MCP scan tools, and as a live reverse proxy in front of a real LLM API
`packages/document-scanner`	`@guardbee/mcp-document-scanner`	Finds PII and credentials inside PDFs, screenshots and scanned documents — PDF text layer plus optional OCR (Turkish and English) — before they reach an LLM
`packages/agent-graph-auditor`	`@guardbee/mcp-agent-graph-auditor`	Builds a reachability graph across multi-agent orchestration configs (LangGraph, CrewAI, AutoGen/ag2) to find transitive excessive agency — an agent that reaches a dangerous tool only through delegation to another agent
`packages/tool-poisoning-scanner`	`@guardbee/mcp-tool-poisoning-scanner`	Scans MCP server tool definitions for tool poisoning (hidden instructions embedded in a tool's description) and confused-deputy mismatches (a read-only-sounding tool whose handler has a shell/eval/file-write/env-dump sink)
`packages/rug-pull-detector`	`@guardbee/mcp-rug-pull-detector`	Connects live to another MCP server (stdio/HTTP), baselines its tools/list response, and detects an "MCP rug pull" — a tool's description/schema/annotations silently changing after it was already approved
`packages/memory-poisoning-scanner`	`@guardbee/mcp-memory-poisoning-scanner`	Scans agent code for memory poisoning — untrusted input written into persistent, cross-session memory (MemGPT-style archival/core memory, or a long-term vector store) that later gets recalled and trusted as context
`packages/oauth-auditor`	`@guardbee/mcp-oauth-auditor`	Scans an MCP server's own authorization code for OAuth 2.1 anti-patterns named in the MCP spec's Security Considerations — token passthrough, missing audience validation, OAuth/OIDC discovery SSRF, missing PKCE, loose redirect_uri validation, hardcoded client secrets
`packages/elicitation-auditor`	`@guardbee/mcp-elicitation-auditor`	Scans MCP server code for elicitation anti-patterns in the 2026-07-28 spec — form mode asking for secrets or payment data, URL mode pointed straight at a third-party authorize endpoint, credentials or PII embedded in the elicitation URL
`packages/toxic-flow-auditor`	`@guardbee/mcp-toxic-flow-auditor`	Audits an MCP tool catalog for toxic flows (Simon Willison's lethal trifecta) — untrusted content + sensitive/private data + exfiltration or destruction on the same server; A–F grade, KVKK-aware heuristics, OWASP MCP10:2025
`packages/audit-gap-auditor`	`@guardbee/mcp-audit-gap-auditor`	Audits MCP server source for OWASP MCP08:2025 (Lack of Audit and Telemetry) — missing tool-call trails, raw args/results in logs, hard-disabled audit, silent catches, audit events without correlation ids
`packages/context-oversharing-auditor`	`@guardbee/mcp-context-oversharing-auditor`	Audits agent/MCP source for OWASP MCP10:2025 context oversharing — full conversation dumps, unscoped memory tools, shared global session stores, system-prompt leaks via tools, cross-session tool-result bleed, unfiltered vector queries (complements toxic-flow’s catalog trifecta)
`packages/owasp-scan`	`@guardbee/mcp-owasp-scan`	Unified OWASP MCP Top 10 meta-scanner — path orchestration of GuardBee auditors + live/catalog `tools/list` toxic-flow/poisoning, A–F grade, SARIF; optional MCP09 Shadow MCP discover
`packages/mcp-config-auditor`	`@guardbee/mcp-config-auditor`	Audits MCP client configs (Cursor/Claude/Windsurf/VS Code) and agent `SKILL.md` for unpinned packages, secrets, wildcard auto-approve, unauthenticated remotes, typosquats, cross-server/skill shadowing; `discover` finds Shadow MCP (OWASP MCP09) vs an org allowlist
`packages/threat-rules`	`@guardbee/mcp-threat-rules`	MCP bridge to Agent Threat Rules (ATR) — runtime detection for prompt injection, tool poisoning, and MCP attacks, with GuardBee follow-up scanner hints
`packages/a2a-auditor`	`@guardbee/mcp-a2a-auditor`	Scans an agent's Agent2Agent (A2A) protocol implementation (TypeScript and Python) for anti-patterns found in the reference SDKs' own source — unauthenticated push-notification webhook fetches (SSRF), Agent Cards with no authentication requirement, credentials embedded in publicly-served Agent Card metadata
`packages/slopsquat-scanner`	`@guardbee/mcp-slopsquat-scanner`	Checks every dependency declared in a project's own manifest (package.json, requirements.txt, pyproject.toml) against the real npm/PyPI registry — flags names that don't exist at all (likely LLM-hallucinated, i.e. slopsquatting) and names that exist but were only very recently published
`packages/unbounded-consumption-auditor`	`@guardbee/mcp-unbounded-consumption-auditor`	Scans LLM/agent application code for Unbounded Consumption ("denial of wallet", OWASP LLM Top 10 2026 #6) — missing output token limits, missing timeouts on hand-rolled LLM HTTP calls, unbounded agent tool-calling/retry loops, explicitly disabled framework safety limits (LangChain max_iterations, openai-agents max_turns), and MCP tool handlers with no visible rate limiting
`packages/secret-scanner`	`@guardbee/mcp-secret-scanner`	Scans files for leaked secrets and API keys
`packages/security-proxy`	`@guardbee/mcp-security-proxy`	MCP security gateway: several MCP servers behind one policy, with toxic-flow (lethal trifecta) blocking, approvals, PII masking and a hash-chained audit log
`packages/security-suite`	`@guardbee/security-suite`	Every scanner and auditor below from one install: one MCP server with the groups you pick, and a CLI that runs any package
`packages/ssl-inspector`	`@guardbee/mcp-ssl-inspector`	TLS certificate/cipher/protocol inspection
`packages/vulnerability-scanner`	`@guardbee/mcp-vulnerability-scanner`	Triggers GuardBee scans, queries findings, AI-assisted remediation guidance
`packages/guard-core`	`@guardbee/guard-core`	(internal) Shared detector library — PII/secret masking, prompt injection rules, tool classification; not an MCP server on its own
`packages/telemetry`	`@guardbee/mcp-telemetry`	(internal) Shared usage-telemetry client — not an MCP server on its own

Security

Found a vulnerability? Report it privately: see SECURITY.md. Contributions are welcome: CONTRIBUTING.md.

Telemetry

Packages can send usage telemetry to GuardBee via @guardbee/mcp-telemetry: which tool is called, how often, and how long it takes. It is off by default (opt-in); nothing is sent unless you set GUARDBEE_TELEMETRY=1. When it is on, a one-time notice is printed to stderr on first use.

To enable: GUARDBEE_TELEMETRY=1 (or true/on/yes); unset it to turn telemetry off again
What's sent: tool name, short (≤40 character) parameter values (e.g. table: "users", limit: 50), success/failure, duration
What's NEVER sent: values under keys like content/text/data/filter/password/email/apiKey/token, and any string longer than 40 characters — all replaced with "[redacted: ...]" by redactParams() in packages/telemetry/src/redact.ts. So the full content of scanned files/code, or the real row data from an insert_row/update_row call, is never sent.

Details: packages/telemetry/README.md.

Development

pnpm install
pnpm build     # turbo run build — all packages, in dependency order
pnpm test      # turbo run test

To work on a single package:

pnpm --filter @guardbee/mcp-ssl-inspector dev

Versioning and publishing

Packages are versioned independently (Changesets). If you changed something in a PR:

pnpm changeset

After merging to main, CI automatically opens a version PR; merging that PR publishes the changed packages to npm (see .github/workflows/release.yml).

Stability

Packages at 1.0 or later follow semantic versioning: a breaking change to the CLI, the MCP tool names and parameters, the config format or the exported API comes only with a new major version, and is listed in the package's CHANGELOG.md. New rules and detectors arrive in minor versions; they can report findings an earlier version did not. Packages still at 0.x may change between minor versions.

Package	Stable since
`@guardbee/mcp-security-proxy`	1.0
`@guardbee/guard-core`	1.0
`@guardbee/mcp-secret-scanner`	1.0
`@guardbee/mcp-prompt-injection-scanner`	1.0
`@guardbee/mcp-prompt-leak-scanner`	1.0
`@guardbee/mcp-toxic-flow-auditor`	1.0

Structure

pnpm workspaces — packages/*, real workspace:* dependencies (e.g. security-suite depends on the other packages directly from the workspace, not a registry version)
Turborepo — build/test/type-check pipeline, dependency-graph-aware ordering and caching
Shared config — tsconfig.base.json and vitest.shared.ts at the root; each package layers its own settings on top

Project history

The monorepo's earlier write-ups are in CHANGELOG.md; each package's release notes are in its own CHANGELOG.md and on GitHub Releases.

@guardbee/mcp Security Proxy

GitHub Actions

Devops Developer Tools Security

Add to Cursor Add to VS Code Run on PlugMCP

GitHub npm Website

Add to Cursor Add to VS Code Run on PlugMCP

1{2  "mcpServers": {3    "guardbee-mcp-security-proxy": {4      "command": "npx",5      "args": [6        "-y",7        "@guardbee/[email protected]"8      ]9    }10  }11}

.cursor/mcp.jsonMCP server

Transport: stdio
Status: Local

Power your agent

Add this server

The publisher's own command. Not a PlugMCP endpoint.

Add to Cursor Add to VS Code Run on PlugMCP

Host a copy with our keys and logs.

Local command

npx -y @guardbee/[email protected]

Claude Code has no install link for a local command. Copy the command below and run it in a terminal.

shClaude Code

1claude mcp add guardbee-mcp-security-proxy -- npx -y @guardbee/mcp-security-proxy@1.27.0

Run in a terminal.

jsonClaude Desktop

1{2  "mcpServers": {3    "guardbee-mcp-security-proxy": {4      "command": "npx",5      "args": [6        "-y",7        "@guardbee/[email protected]"8      ]9    }10  }11}

claude_desktop_config.json

Local · npmPublisher installStep-by-step: add this in Claude

Remote URL or a command on your machine? How the two installs differ

Run on PlugMCP

Host a copy with our keys and logs.

A new server you create. It is not this listing's official endpoint. Use the publisher install when you want their URL and their credentials.

Launch

Server facts

Local

Transport: stdio
Version: 1.27.0
Last checked: 2026-10-27

Stars: —
Tools: —
Uptime: —

Overview

About @guardbee/mcp Security Proxy

Tools

No tool list yet. Remote servers get one after the first health check.

FAQ

Questions

How do I install @guardbee/mcp Security Proxy?

Copy the stdio config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does @guardbee/mcp Security Proxy need an API key?

No required environment variable is listed on this record.

What transport does @guardbee/mcp Security Proxy use?

@guardbee/mcp Security Proxy runs locally over stdio.

When was @guardbee/mcp Security Proxy last checked?

From the publisher

Documentation

GuardBee MCP

# Put your existing MCP servers behind the gateway (backs up your client config first)
npx -y @guardbee/mcp-security-proxy@^1 init --client claude-desktop   # or cursor, claude-code

# Check a codebase against the OWASP MCP Top 10
npx -y @guardbee/mcp-owasp-scan scan . --fail-on=high

An agent calls a CRM through GuardBee: personal data is masked, a prompt injection is blocked, and sending data out after reading untrusted and sensitive content is refused

Run it yourself: examples/demo (npm install && npm start).

Which package should I use?

You want to…	Install	How
Protect agents at runtime: mask personal data, block injection and toxic flows, approve risky calls, keep an audit log	`@guardbee/mcp-security-proxy`	Put it in front of your MCP servers (`guardbee-proxy init` imports your client config)
Check a codebase against the OWASP MCP Top 10 in one pass, in CI	`@guardbee/mcp-owasp-scan`	`npx @guardbee/mcp-owasp-scan scan . --format=sarif --fail-on=high`
Give an agent many GuardBee checks from one MCP server	`@guardbee/security-suite`	`guardbee serve` (recommended set), `--tools=code,network` or `all`
Find leaked keys in files, git history or agent transcripts	`@guardbee/mcp-secret-scanner`	`npx @guardbee/mcp-secret-scanner scan . --history`
Audit the MCP servers configured on developer machines	`@guardbee/mcp-config-auditor`	`npx @guardbee/mcp-config-auditor discover`
Let an agent query a database without seeing raw personal data	`@guardbee/mcp-db-gateway`	Point it at your database with a policy
Use the detectors in your own code	`@guardbee/guard-core`	`import { maskPiiInText } from "@guardbee/guard-core"`

Every other package is a single check (one OWASP risk, one protocol, one file type); each is in security-suite too. npx @guardbee/security-suite list shows them with what they check.

Benchmarks

Detection is measured, not claimed: packages/pii-bench is a reproducible benchmark for Turkish and international personal data, with bootstrap 95% intervals and the datasets in the repo.

Benchmark	Result
Identifiers (TC Kimlik, IBAN, card, phone, e-mail, …), 400 documents + 160 clean	F1 97.1, recall 100%, false alarms on clean documents 8.1%, 0.04 ms per document
Person names with the optional NER model, same set	F1 99.5
Hand-written hard cases for names (tr-names-challenge)	F1 97.1, 0 false alarms
KVKK Art. 6 special categories with NER (tr-special-challenge)	F1 97.5, 0 false alarms
Bypass suite: 5 identifiers × 16 disguises (base64, hex, URL/HTML/`\u` escapes, other scripts' digits, separators)	80 / 80 masked, 0 of 16 look-alike strings changed

Examples

Packages

Package	npm	Description
`packages/ai-code-scanner`	`@guardbee/mcp-ai-code-scanner`	Scans a codebase for insecure LLM/AI integration patterns (client-exposed keys, unsafe output handling, excessive agency, PII→prompt, prompt injection)
`packages/compliance-checker`	`@guardbee/mcp-compliance-checker`	KVKK/GDPR/CCPA compliance checks
`packages/dependency-auditor`	`@guardbee/mcp-dependency-auditor`	CVE scanning for npm/pip/cargo dependencies (OSV)
`packages/dns-intelligence`	`@guardbee/mcp-dns-intelligence`	DNS record enumeration, misconfiguration and dangling-subdomain detection
`packages/db-gateway`	`@guardbee/mcp-db-gateway`	KVKK/GDPR-compliant gateway between an LLM and a database (PII masking, RBAC, rate limiting, queryable audit log; Prisma/Postgres/MySQL/SQLite/MongoDB adapters; optional insert/update/delete support)
`packages/mcp-server-auditor`	`@guardbee/mcp-server-auditor`	Scans other MCP servers' tool definitions for insecure patterns (excessive agency, shell/eval/SQL/SSRF sinks, loose schemas, hardcoded secrets, wildcard CORS)
`packages/prompt-injection-scanner`	`@guardbee/mcp-prompt-injection-scanner`	Scans RAG content/scraped pages for indirect prompt injection (instruction override, spoofed role/chat-template tokens, hidden text, "Dear AI" direct address, data-exfiltration instructions)
`packages/llm-redteam`	`@guardbee/mcp-llm-redteam`	Actively red-teams a live LLM endpoint/chatbot with canary-based jailbreak/extraction/obfuscation probes (OpenAI/Anthropic/webhook targets)
`packages/model-scanner`	`@guardbee/mcp-model-scanner`	Scans ML model files (PyTorch, pickle, safetensors, Keras/H5, ONNX) for supply-chain risks — dangerous pickle deserialization globals, disguised/malformed safetensors headers, Keras Lambda-layer RCE, ONNX external-data path traversal
`packages/reverse-shield`	`@guardbee/mcp-reverse-shield`	The defensive side of reverse-engineering MCPs: audits a shipped web build or live site, Electron app, Android APK or native/.NET binary for what an analyst gets for free — exposed source maps, missing minification/R8/.NET obfuscation, debug info and symbols, debuggable flags, Electron fuses, missing code signing, embedded keys; A–F grade
`packages/vector-store-scanner`	`@guardbee/mcp-vector-store-scanner`	Probes vector-database endpoints (Weaviate, Qdrant, Chroma, Elasticsearch/OpenSearch, Redis, Postgres/pgvector) for unauthenticated exposure of embeddings and RAG data
`packages/prompt-leak-scanner`	`@guardbee/mcp-prompt-leak-scanner`	Catches leaked credentials and PII (API keys, TC Kimlik No, credit cards, IBANs) in outbound LLM prompts — as MCP scan tools, and as a live reverse proxy in front of a real LLM API
`packages/document-scanner`	`@guardbee/mcp-document-scanner`	Finds PII and credentials inside PDFs, screenshots and scanned documents — PDF text layer plus optional OCR (Turkish and English) — before they reach an LLM
`packages/agent-graph-auditor`	`@guardbee/mcp-agent-graph-auditor`	Builds a reachability graph across multi-agent orchestration configs (LangGraph, CrewAI, AutoGen/ag2) to find transitive excessive agency — an agent that reaches a dangerous tool only through delegation to another agent
`packages/tool-poisoning-scanner`	`@guardbee/mcp-tool-poisoning-scanner`	Scans MCP server tool definitions for tool poisoning (hidden instructions embedded in a tool's description) and confused-deputy mismatches (a read-only-sounding tool whose handler has a shell/eval/file-write/env-dump sink)
`packages/rug-pull-detector`	`@guardbee/mcp-rug-pull-detector`	Connects live to another MCP server (stdio/HTTP), baselines its tools/list response, and detects an "MCP rug pull" — a tool's description/schema/annotations silently changing after it was already approved
`packages/memory-poisoning-scanner`	`@guardbee/mcp-memory-poisoning-scanner`	Scans agent code for memory poisoning — untrusted input written into persistent, cross-session memory (MemGPT-style archival/core memory, or a long-term vector store) that later gets recalled and trusted as context
`packages/oauth-auditor`	`@guardbee/mcp-oauth-auditor`	Scans an MCP server's own authorization code for OAuth 2.1 anti-patterns named in the MCP spec's Security Considerations — token passthrough, missing audience validation, OAuth/OIDC discovery SSRF, missing PKCE, loose redirect_uri validation, hardcoded client secrets
`packages/elicitation-auditor`	`@guardbee/mcp-elicitation-auditor`	Scans MCP server code for elicitation anti-patterns in the 2026-07-28 spec — form mode asking for secrets or payment data, URL mode pointed straight at a third-party authorize endpoint, credentials or PII embedded in the elicitation URL
`packages/toxic-flow-auditor`	`@guardbee/mcp-toxic-flow-auditor`	Audits an MCP tool catalog for toxic flows (Simon Willison's lethal trifecta) — untrusted content + sensitive/private data + exfiltration or destruction on the same server; A–F grade, KVKK-aware heuristics, OWASP MCP10:2025
`packages/audit-gap-auditor`	`@guardbee/mcp-audit-gap-auditor`	Audits MCP server source for OWASP MCP08:2025 (Lack of Audit and Telemetry) — missing tool-call trails, raw args/results in logs, hard-disabled audit, silent catches, audit events without correlation ids
`packages/context-oversharing-auditor`	`@guardbee/mcp-context-oversharing-auditor`	Audits agent/MCP source for OWASP MCP10:2025 context oversharing — full conversation dumps, unscoped memory tools, shared global session stores, system-prompt leaks via tools, cross-session tool-result bleed, unfiltered vector queries (complements toxic-flow’s catalog trifecta)
`packages/owasp-scan`	`@guardbee/mcp-owasp-scan`	Unified OWASP MCP Top 10 meta-scanner — path orchestration of GuardBee auditors + live/catalog `tools/list` toxic-flow/poisoning, A–F grade, SARIF; optional MCP09 Shadow MCP discover
`packages/mcp-config-auditor`	`@guardbee/mcp-config-auditor`	Audits MCP client configs (Cursor/Claude/Windsurf/VS Code) and agent `SKILL.md` for unpinned packages, secrets, wildcard auto-approve, unauthenticated remotes, typosquats, cross-server/skill shadowing; `discover` finds Shadow MCP (OWASP MCP09) vs an org allowlist
`packages/threat-rules`	`@guardbee/mcp-threat-rules`	MCP bridge to Agent Threat Rules (ATR) — runtime detection for prompt injection, tool poisoning, and MCP attacks, with GuardBee follow-up scanner hints
`packages/a2a-auditor`	`@guardbee/mcp-a2a-auditor`	Scans an agent's Agent2Agent (A2A) protocol implementation (TypeScript and Python) for anti-patterns found in the reference SDKs' own source — unauthenticated push-notification webhook fetches (SSRF), Agent Cards with no authentication requirement, credentials embedded in publicly-served Agent Card metadata
`packages/slopsquat-scanner`	`@guardbee/mcp-slopsquat-scanner`	Checks every dependency declared in a project's own manifest (package.json, requirements.txt, pyproject.toml) against the real npm/PyPI registry — flags names that don't exist at all (likely LLM-hallucinated, i.e. slopsquatting) and names that exist but were only very recently published
`packages/unbounded-consumption-auditor`	`@guardbee/mcp-unbounded-consumption-auditor`	Scans LLM/agent application code for Unbounded Consumption ("denial of wallet", OWASP LLM Top 10 2026 #6) — missing output token limits, missing timeouts on hand-rolled LLM HTTP calls, unbounded agent tool-calling/retry loops, explicitly disabled framework safety limits (LangChain max_iterations, openai-agents max_turns), and MCP tool handlers with no visible rate limiting
`packages/secret-scanner`	`@guardbee/mcp-secret-scanner`	Scans files for leaked secrets and API keys
`packages/security-proxy`	`@guardbee/mcp-security-proxy`	MCP security gateway: several MCP servers behind one policy, with toxic-flow (lethal trifecta) blocking, approvals, PII masking and a hash-chained audit log
`packages/security-suite`	`@guardbee/security-suite`	Every scanner and auditor below from one install: one MCP server with the groups you pick, and a CLI that runs any package
`packages/ssl-inspector`	`@guardbee/mcp-ssl-inspector`	TLS certificate/cipher/protocol inspection
`packages/vulnerability-scanner`	`@guardbee/mcp-vulnerability-scanner`	Triggers GuardBee scans, queries findings, AI-assisted remediation guidance
`packages/guard-core`	`@guardbee/guard-core`	(internal) Shared detector library — PII/secret masking, prompt injection rules, tool classification; not an MCP server on its own
`packages/telemetry`	`@guardbee/mcp-telemetry`	(internal) Shared usage-telemetry client — not an MCP server on its own

Security

Found a vulnerability? Report it privately: see SECURITY.md. Contributions are welcome: CONTRIBUTING.md.

Telemetry

To enable: GUARDBEE_TELEMETRY=1 (or true/on/yes); unset it to turn telemetry off again
What's sent: tool name, short (≤40 character) parameter values (e.g. table: "users", limit: 50), success/failure, duration
What's NEVER sent: values under keys like content/text/data/filter/password/email/apiKey/token, and any string longer than 40 characters — all replaced with "[redacted: ...]" by redactParams() in packages/telemetry/src/redact.ts. So the full content of scanned files/code, or the real row data from an insert_row/update_row call, is never sent.

Details: packages/telemetry/README.md.

Development

pnpm install
pnpm build     # turbo run build — all packages, in dependency order
pnpm test      # turbo run test

To work on a single package:

pnpm --filter @guardbee/mcp-ssl-inspector dev

Versioning and publishing

Packages are versioned independently (Changesets). If you changed something in a PR:

pnpm changeset

After merging to main, CI automatically opens a version PR; merging that PR publishes the changed packages to npm (see .github/workflows/release.yml).

Stability

Package	Stable since
`@guardbee/mcp-security-proxy`	1.0
`@guardbee/guard-core`	1.0
`@guardbee/mcp-secret-scanner`	1.0
`@guardbee/mcp-prompt-injection-scanner`	1.0
`@guardbee/mcp-prompt-leak-scanner`	1.0
`@guardbee/mcp-toxic-flow-auditor`	1.0

Structure

pnpm workspaces — packages/*, real workspace:* dependencies (e.g. security-suite depends on the other packages directly from the workspace, not a registry version)
Turborepo — build/test/type-check pipeline, dependency-graph-aware ordering and caching
Shared config — tsconfig.base.json and vitest.shared.ts at the root; each package layers its own settings on top

Project history

The monorepo's earlier write-ups are in CHANGELOG.md; each package's release notes are in its own CHANGELOG.md and on GitHub Releases.