Create an action anchored to a project. Set setAsNext to make it the project's next action pointer. Returns the full RPC result including the action id. When the created action has no dueAt the response carries warnings[] with code no_due_date — nothing is rejected, but an action with no clock is invisible to the attention layer.

Same semantics as POST /actions. 'decide' + actionType='strategy_checkpoint' proposes a strategy checkpoint; approval is human-only.

When the expected signal is due. Persisted on the action (1.29.0); alias: expected_signal_at.

RECOMMENDED. Same three-layer rule as POST /actions: a declared key refuses a second OPEN action for the same objective with 409 COMMITMENT_ALREADY_OPEN; with no key the server derives auto:<kind>:<id>:<action_type> from an object DECLARED IN THE BODY (the project in the path is this route's container, not an objective, so it never derives a key); otherwise a look-alike OPEN action is refused 409 POSSIBLE_DUPLICATE, overridable with confirm_new: true. Alias: commitment_key.

Send true to override a POSSIBLE_DUPLICATE refusal. Never merges, edits or closes anything; does not override COMMITMENT_ALREADY_OPEN.

ACCEPTED AND IGNORED (1.56.0). purpose is a PROJECT field, not an action field: it is not stored on the action and it hides nothing. The action is created exactly as if the field had not been sent and it appears in the normal queues (/next, /state, /prompts, /decisions/recommendation, nudges, digest). When present the response carries purpose_ignored: true and purpose_ignored_note { code: "purpose_ignored", message }. To practise, POST /projects with purpose 'test' and create the actions inside that project.