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fusion/.changeset/enforce-workflow-step-readonly.md
Fusion 458c2343a1 feat(FN-4366): enforce readonly tool allowlist for workflow steps
Added a readonly tool allowlist enforcement for workflow steps, blocking execution of state-mutating tools (`fn_task_update`, `fn_task_move`, etc.) during workflow step runs. The policy is wired into the executor and merger execution paths, with tests covering allowlist enforcement and a documentati

Fusion-Task-Id: FN-4366
2026-05-14 06:24:03 -07:00

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"@runfusion/fusion": patch
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Enforce `workflow_steps.toolMode="readonly"` as a hard tool allowlist at the engine's agent-session layer. Readonly workflow steps can no longer hold Edit, Write, Bash, or task/agent mutation tools. Steps that attempted to write under `toolMode="readonly"` now fail closed with a `READONLY_VIOLATION` outcome instead of silently staging files.