Delegus for Python MCP servers: ASGI middleware that checks every MCP tools/call against the caller's delegated authority before it runs (MCPServer streamable HTTP, Starlette, FastAPI).
Python port of the Delegus v0.2 protocol layer (delegus-base-v1): Grant/Proof parsing, checks P1-P20, receipt assembly, signing and offline re-verification. No I/O; snapshots and clock are injected. Passes the 40 conformance vectors.
Anthropic, PBC
Visionary sponsor
Bloomberg
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Hudson River Trading
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Meta
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NVIDIA
Visionary sponsor
Microsoft
Sustainability sponsor
Depot
Continuous Integration
AWS
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Datadog
Monitoring
Fastly
CDN
Google
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Sentry
Error logging
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