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docs(agent-contract): sync with canonical.ts (child-session flags, delegation.control, approval marker) #379

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docs(agent-contract): sync with canonical.ts (child-session flags, delegation.control, approval marker) #379

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11 changes: 8 additions & 3 deletions docs-site/docs/features/agent-contract.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -65,12 +65,12 @@ surface they drive:
| Tools | `tool.started`, `tool.progress`, `tool.completed` |
| Files and artifacts | `file.changed`, `artifact.created`, `artifact.delivered` |
| Terminal | `terminal.output` |
| Child sessions | `child.started`, `child.updated`, `child.completed` |
| Child sessions | `child.started`, `child.updated`, `child.completed`, `delegation.control` (wait, send, resume, close, gather) |
| Approvals | `approval.requested`, `approval.resolved` |
| Questions | `question.requested`, `question.resolved` |
| Commands and mode | `commands.updated`, `mode.updated` |
| Usage | `usage.updated` |
| Context markers | `context.marker` (memory, knowledge, skill, playbook, rule, reconciling) |
| Context markers | `context.marker` (memory, knowledge, skill, playbook, rule, reconciling, approval) |
| Harness diagnostics | `harness.warning`, `harness.error` (with a `fatal` flag) |

Three design rules keep the union honest:
Expand All @@ -93,12 +93,17 @@ declared or negotiated by the native driver and persisted with the session:
| Area | Flags |
| --- | --- |
| Streaming and structure | `streamingText`, `reasoning`, `plans`, `toolProgress`, `fileDiffs` |
| Delegation | `childSessions` |
| Delegation | `nativeChildProjection`, `gatewayChildSessions` |
| Interaction | `approvals`, `questions`, `commands` |
| Accounting and choice | `usage`, `modelSelection` |
| Session lifecycle | `resume`, `load`, `close`, `stop`, `reconcile` |
| Runtime surfaces | `directTerminal`, `desktop`, `nativeEmbed`, `knowledgeTools` |

The two delegation flags are independent:

- `nativeChildProjection`: the engine's own subagent or task fan-out is translated into `child.started` / `child.updated` / `child.completed`. It is only real where the provider actually emits child sessions (the OpenCode protocol and the canonical runtime adapter).
- `gatewayChildSessions`: the product's child-session tools are available. Their durable thread lifecycle does not change the parent engine's protocol.

The UI gates every surface on this map and never on an engine name. A missing
or non-boolean flag normalizes to `false`
(`normalizeNegotiatedCapabilities`), so an absent capability reads as an
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