What exact context modes should the extension support for child agents, including active-branch forked work, fully independent work, parent-summary seeding, persistent sessions, and adversarial review isolation?
Decisions
Version one supports only first-class fork and independent context modes.
Persistent child lifetimes are intentionally out of version one.
Summary-seeded context is not a first-class version-one mode.
fork uses the full active-branch transcript snapshot, not a summarized or tool-output-stripped transform.
fork adds a small wrapper that defines the delegated role, context boundary, and expected return shape.
User-facing wording should avoid "child agent".
Prefer "delegated agent", "subagent", or "worker" depending on context.
independent receives the task prompt, selected agent definition, and normal trusted project context such as AGENTS.md.
independent receives no parent transcript and no generated parent summary by default.
Spawn requests may include explicit attachments or snippets for independent runs.
Context mode precedence is layered: global extension default, then agent definition default, then explicit spawn override.
Agent definitions may optionally constrain allowed context modes when an agent should never receive parent conversation context.
The version-one global default context mode is independent.
Parent conversation context is opt-in through fork, not inherited by default.
fork does not require special user confirmation in version one.
Confirmation is reserved for risky capabilities such as write tools, shell access, project extension inheritance, external directories, or higher-cost model selection.
fork copies the active branch as-is and lets child Pi handle any normal compaction.
Version one should not preflight context size into refusal or hidden summarization.
The parent receives the final textual result plus compact metadata by default.
Compact metadata includes agent name, context mode, elapsed time, stop reason, and child status/session id.
The default result should not copy selected evidence snippets or the child transcript into the parent context.
