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Issacboy123 merged 1 commit into from
Aug 28, 2026
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docs(coding-agent): document persistent subagent sessions #116

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1 change: 1 addition & 0 deletions packages/coding-agent/CHANGELOG.md
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Expand Up @@ -5,6 +5,7 @@
### Added

- Added `pi auth check` provider/model auth preflight with optional credential output ([#7152](https://github.com/earendil-works/pi/issues/7152)).
- Added durable, branch-scoped sub-agent rosters and child histories for saved sessions, with interrupted restoration and explicit wake without automatic work, replay, or result delivery.

### Changed

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9 changes: 9 additions & 0 deletions packages/coding-agent/docs/sessions.md
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Expand Up @@ -27,13 +27,22 @@ For the JSONL file format and SessionManager API, see [Session Format](session-f
| `/new` | Start a new session |
| `/name <name>` | Set the current session display name |
| `/session` | Show session info |
| `/subagents` | Show sub-agents in the current session |
| `/tree` | Navigate the current session tree |
| `/fork` | Create a new session from a previous user message |
| `/clone` | Duplicate the current active branch into a new session |
| `/compact [prompt]` | Summarize older context; see [Compaction](compaction.md) |
| `/export [file]` | Export session to HTML |
| `/share` | Upload as a secret GitHub Gist and return its direct URL |

## Sub-agents in Saved Sessions

Saved parent sessions automatically preserve their branch-scoped sub-agent roster and usable child histories. Reopening a parent restores terminal records as recorded and changes children that were queued or running to interrupted. Reopening does not resume provider work, replay the original task, or redeliver a completed result.

An explicit wake resumes a child from its saved history when that history is usable. If the history is missing, unsafe, or invalid, Diffex creates an isolated replacement and runs only the wake message. A wake uses the child's complete captured model, thinking level, tools, and harness when all remain usable; otherwise it uses the complete current parent configuration and reports a warning rather than mixing configurations.

Branch navigation and session-context resets reconcile the roster only after the transition is safe. In-memory parents and `--no-session` sessions keep sub-agents ephemeral. Setting `subagents: false` disables the sub-agent tools without erasing a saved roster.

## Resuming and Deleting Sessions

`/resume` opens an interactive session picker for the current project. `diffex -r` opens the same picker at startup.
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