> ## Documentation Index
> Fetch the complete documentation index at: https://checkfu.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Session execution graph

> How Checkfu records actors, fidelity, portable continue, and native resume without inventing collaboration.

A Session is the durable record of work that happened inside it. An agent is an attributed projection of that record, not a hidden transcript.

Checkfu does not capture private chain of thought, provider caches, or an uncommitted output suffix.

## Event log vs Session Bundle

`GET /v1/sessions/{id}/export` returns the owned **event log**: every persisted envelope plus explicit unavailable positions. That is the format `checkfu.session-export`. It is a complete tape of what happened, not the full Session graph.

A **Session Bundle** (`checkfu.session-bundle`) is the complete offline artifact: events or unavailable positions for `1..end_sequence`, plus actor, work, recovery, artifact, and capsule sections. The event log cannot render graph, recovery, or learning views by itself. See [Export and own your logs](/guides/export-your-log).

## Portable continue vs native resume

| Phrase                | Means                                                                                                                                          |
| --------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------- |
| **Portable continue** | Replay canonical semantic context on a compatible harness. Hidden model state is not pretended to exist.                                       |
| **Native resume**     | Restore a qualified continuation capsule. Stronger only when the exact importer still matches.                                                 |
| **SSE reconnect**     | Resume a dropped event stream with `Last-Event-ID`. That is a cursor, not native continuation. See [Resume a stream](/guides/resume-a-stream). |

A failed harness switch keeps the frozen source frontier. It does not advance context.

## Adapter fidelity

Unsupported collaboration is not inferred from timing, tool names, or a vendor UI.

| Adapter                             | Subagents   | Teams       | Workflows   | Native transcript |
| ----------------------------------- | ----------- | ----------- | ----------- | ----------------- |
| First-party Checkfu harness         | complete    | flattened   | observed    | structured        |
| Generic Vercel HarnessAgent         | observed    | unsupported | unsupported | unsupported       |
| Claude Agent (`claude-code`)        | observed    | unsupported | unsupported | unsupported       |
| Codex, Pi, OpenCode, Hermes, Cursor | unsupported | unsupported | unsupported | unsupported       |
| Connected runtime                   | unsupported | unsupported | unsupported | unsupported       |
| Customer ACP                        | unsupported | unsupported | unsupported | unsupported       |

A claimed posture cannot outrank that ceiling. Claude Agent may observe nested tasks; it cannot promote teams or workflows the generic stream does not correlate.

## What this does not promise

* Exporting a Session Bundle from the public API (the current export is the event log).
* A public operation that switches an idle thread onto another harness.
* Native resume without a current, qualified capsule.