io.github.stand-out-of-my-sun/diogenes-agent-guardrails-mcp

up checked 2026-11-12T10:39:02.334Z

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Publisher-provided title

Diogenes Agent Guardrails & Sandbox MCP

Publisher-provided description

Autonomous agent guardrails, bash sandboxing, MCP rugpull diffing & prompt firewalls.

Summary by lookupd

Audits MCP servers, agent commands, SQL and outbound URLs for injection and unsafe actions, redacts PII, and sandboxes Python execution.

Install

Claude Code, remote (streamable-http)

claude mcp add --transport http diogenes-agent-guardrails https://diogenes-micro-gateway.corinth.workers.dev/mcp/agent-guardrails

Codex, remote (streamable-http)

codex mcp add diogenes-agent-guardrails --url https://diogenes-micro-gateway.corinth.workers.dev/mcp/agent-guardrails

Cursor, remote (streamable-http) → .cursor/mcp.json

{
  "mcpServers": {
    "diogenes-agent-guardrails": {
      "url": "https://diogenes-micro-gateway.corinth.workers.dev/mcp/agent-guardrails"
    }
  }
}

Other clients: docs. Or tell your agent: Set up lookupd for me: read https://lookupd.com/agent.md and follow it.

Tools (12 tools)

Publisher-provided text

• verify_agent_command_safety Evaluates untrusted agent prompts, bash commands, and tool arguments to block prompt injection, destructive shell commands, and private-key exfiltration. Use wh
• validate_sql_query_ast Performs static AST syntax tree parsing on SQL statements to verify strictly read-only SELECT clauses and reject mutations, stacked queries, or comment bypasses
• execute_python_sandbox Audits Python source code for forbidden syscalls (os, subprocess, socket, open, eval) inside an AST-governed WebAssembly sandbox with no host filesystem access.
• audit_mcp_server_manifest Scans an external MCP server's initial tools/list manifest to detect tool-name shadowing (read_file, bash) and hidden prompt-injection directives in description
• detect_mcp_schema_rugpull Computes structural diffs between a pinned baseline MCP tools/list snapshot and a live server response to catch mid-session description or schema tampering. Use
• validate_mcp_sampling_request Audits inbound MCP sampling/createMessage callbacks from connected servers to block cross-server context snooping (includeContext='allServers') and token quota
• sanitize_tool_output_stream Sanitizes untrusted external tool or web-scrape outputs by stripping invisible Unicode Tag characters (U+E0000), neutralizing Markdown tracking image beacons, a
• redact_sensitive_pii Redacts emails, phone numbers, SSNs, credit cards, API keys, and crypto private keys from text before logging or external transmission. Use when stripping perso
• detect_agent_action_loop Analyzes an agent's recent tool-call trace to detect identical retry spins, A/B state oscillation, and runaway token burn. Use when monitoring autonomous agent
• verify_a2a_agent_card Verifies a remote agent's A2A /.well-known/agent.json discovery card, checking JWS/DID signature binding, endpoint HTTPS enforcement, and capability spoofing. U
• audit_outbound_egress_url Static validation firewall for outbound network destination URIs against cloud metadata IP addresses (169.254.169.254), RFC 1918 private IP blocks, and query-st
• audit_response_factuality Cross-references factual claims, numbers, and citations in a draft agent response against retrieved source passages to flag unsupported hallucinations before de

Details

• Version: 1.0.0
• Transports: streamable-http
• Uptime (7 days): 100%
• Median latency: 544 ms
• First indexed: 2026-11-01T09:56:07.553Z
• Last seen in registry: 2026-11-01T09:56:07.553Z
• Repository: https://github.com/stand-out-of-my-sun/diogenes-agent-guardrails-mcp
• Website: https://diogenes-micro-gateway.corinth.workers.dev

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