atlas-pca-agent-framework

Microsoft Agent Framework guard for Proof-Carrying Authority (PCA): make every Agent Framework tool call proof-carrying and policy-gated. A tool only runs when the agent carries a valid, in-plan, resource-correct proof for exactly that action. The adapter delegates all verification to atlas-pca and reimplements no cryptography.

Status: 0.4.1, unaudited.

What is tested

The default test suite runs without the framework, against the shared conformance proofs. A second suite, make test-real (needs the framework installed), runs against the real framework and is pinned to Microsoft Agent Framework 1.21.0 (agent-framework-core). It covers a real Agent with a scripted offline chat client and the framework's function-invocation layer: pca_tool and pca_function_middleware allow with a valid proof and refuse a missing, tampered, wrong-audience or insufficient-capability one without running the tool. Each denial test checks that the tool body never ran, and checks the refusal reason wherever the framework surfaces it.

Not covered: other framework versions (only the pinned one is exercised), live model providers (the models are scripted and offline), and any property of the underlying atlas-pca verifier beyond what it already documents. This package has not been independently audited.

Install

pip install atlas-pca-agent-framework

This installs atlas-pca>=0.4.1,<0.5 as a dependency.

Use

Entry points: pca_tool / pca_function_middleware.

from atlas_pca_agent_framework import pca_tool

See the module docstrings in atlas_pca_agent_framework for the full API, and the PCA specification for the model. The verifier applies the full check order, including grant_ref_bound (the signed grant_ref must equal the root capability id), as of atlas-pca 0.2.0.

Links

• Source: https://github.com/Atlas-Authorization/pca-python
• Specification and docs: https://github.com/Atlas-Authorization/pca

License: MIT