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Model-authored Python calls these tools from the Sandbox. The Sandbox broker forwards each call to Fleet, which runs it under the Session’s authority. See Sandbox execution.

Semantic and recursive calls

Session Workspace

Writes take effect immediately and don’t depend on Turn Commit. Pass expected_sha256 to edit_workspace_text or delete_workspace_path to refuse the change if the file has changed.

Projects

Projects hold deliverables that stay browsable across Sessions. Paths take the form <slug>/<path>, and a leading projects/ is accepted as an alias. Writes take effect immediately.

Attachments and Artifacts

Artifact candidates become Artifacts only when the Turn commits.

Memory

Task and history

Skills

See Use Skills.
Last modified on October 9, 2026