Developer Builds Capability-Based Security Layer to Control AI Agent Permissions
A developer has released Agent Firewall, an open-source security library designed to enforce fine-grained, cryptographically signed permissions for AI agents. Unlike traditional API keys, which grant binary all-or-nothing access, the tool issues scoped capabilities that can be time-limited, narrowed, and individually revoked. Each capability tracks a full lifecycle — from issuance through use, revocation, or expiration — providing an audit trail that API keys lack. The project, which now includes over 1,400 passing tests and SQLite-backed persistence as of version 0.8, also supports HTTP and Model Context Protocol boundaries to intercept and authorize agent requests before execution. The developer plans to freeze the API and release full documentation with version 1.0, aiming to make the tool production-ready.
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