MCP Server

Substr8 exposes governance through the Model Context Protocol (MCP).

Public Endpoint

https://mcp.substr8labs.com

Local Server

substr8 mcp start --local

Default port: 9988

Available Tools (12)

Governance

Tool	Description
`run.start`	Start a governed run
`run.end`	End a run, finalize RunProof
`tool.invoke`	Record a tool invocation
`policy.check`	Check if action is allowed

Audit

Tool	Description
`audit.timeline`	Get audit entries for a run
`verify.run`	Verify a run’s integrity

Memory

Tool	Description
`memory.write`	Store a memory with provenance
`memory.search`	Semantic search over memories

CIA (Conversation Integrity)

Tool	Description
`cia.status`	Check CIA proxy health
`cia.report`	Get aggregate stats
`cia.repairs`	List recent repairs
`cia.receipts`	Query receipts by run

Claude Desktop Config

{
  "mcpServers": {
    "substr8": {
      "url": "https://mcp.substr8labs.com",
      "headers": {
        "X-Substr8-Key": "your-api-key"
      }
    }
  }
}

Authentication

Cloud MCP requires an API key:

X-Substr8-Key: your-api-key

Local mode auto-generates a key on startup.

Rate Limits

Tier	Requests/min
Free	100
Pro	1,000
Enterprise	10,000

RunProof Framework Integrations