api-reference

Per-Node SDK Callbacks in Archon Workflows: Complete Hook Reference

April 10, 2026 coleam00/Archon ↗

Archon supports 21 distinct per-node SDK callback hooks—including PreToolUse, PostToolUseFailure, SessionStart, and PermissionRequest—that allow workflow nodes to intercept Claude Agent SDK events through optional regex matchers and static JSON responses.

The coleam00/Archon workflow engine enables granular control over AI agent execution by defining per-node SDK callbacks directly within your DAG (directed acyclic graph) configuration. These hooks, validated against strict Zod schemas in the source code, map one-to-one to the

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