diff --git a/CLAUDE.md b/CLAUDE.md
index 7ffdba5c0..c9f62c500 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -12,6 +12,7 @@ This repo contains the CLI for Entire.
 - `entire/`: Main CLI entry point
 - `entire/cli`: CLI utilities and helpers
 - `entire/cli/commands`: actual command implementations
+- `entire/cli/agent`: agent implementations (Claude Code, Gemini CLI, OpenCode) - see [Agent Integration Checklist](docs/architecture/agent-integration-checklist.md)
 - `entire/cli/strategy`: strategy implementations - see section below
 - `entire/cli/checkpoint`: checkpoint storage abstractions (temporary and committed)
 - `entire/cli/session`: session state management
diff --git a/docs/architecture/agent-integration-checklist.md b/docs/architecture/agent-integration-checklist.md
new file mode 100644
index 000000000..fb11a39dc
--- /dev/null
+++ b/docs/architecture/agent-integration-checklist.md
@@ -0,0 +1,75 @@
+# Agent Integration Checklist
+
+This document provides requirements and a checklist for integrating new AI coding agents with Entire. Use this when implementing support for a new agent (e.g., Claude Code, Gemini CLI, OpenCode).
+
+## Core Principle: Full Transcript Storage
+
+Entire stores the **complete session transcript** at every checkpoint, not incremental diffs. This enables:
+
+- Simple rewind: restore the full transcript, agent resumes from that state
+- No dependency on previous checkpoints being intact
+- Consistent behavior across all checkpoint types (committed, uncommitted)
+
+**Each checkpoint must contain the full session history up to that point.**
+
+## Core Principle: Native Format Preservation
+
+Store transcripts in the **agent's native format**. Any transformation or normalization should only be done to support CLI features (rewind, resume, summarization, file extraction), not for backend or web UI consumption.
+
+**Why:**
+- The backend/web UI should handle format differences, not the CLI
+- Transforming for downstream consumers couples the CLI to their requirements
+- Native formats ensure compatibility with agent's own import/export tools
+- Reduces risk of data loss from lossy transformations
+- Format changes that break the UI can be fixed with a backend deploy; CLI changes require a full release cycle and user adoption
+
+**Do:**
+- Store the raw transcript as the agent produces it
+- Parse the native format when CLI features need specific data (e.g., extract file paths for `entire status`)
+- Let the backend normalize formats for display
+
+**Don't:**
+- Create a "universal transcript format" in the CLI
+- Transform logs to match what the web UI expects
+- Strip or restructure data to simplify backend processing
+- Create intermediate formats (e.g., converting JSON to JSONL for "easier parsing")
+- Reconstruct transcripts from events when a canonical export exists
+
+## Integration Checklist
+
+### Transcript Capture
+
+- [ ] **Full transcript on every turn**: At turn-end, capture the complete session transcript, not just events since the last checkpoint
+- [ ] **Resumed session handling**: When a user resumes an existing session, the transcript must include all historical messages, not just new ones since the plugin/hook loaded
+- [ ] **Use agent's canonical export**: Prefer the agent's native export command (e.g., `opencode export`, reading Claude's JSONL file) over manually reconstructing from events
+- [ ] **No custom formats**: Store the agent's native format directly in `NativeData` - do not convert between formats (e.g., JSON to JSONL) or create intermediate representations
+- [ ] **Graceful degradation**: If the canonical source is unavailable (e.g., agent shutting down), fall back to best-effort capture with clear documentation of limitations
+
+### Session Storage Abstraction
+
+- [ ] **`WriteSession` implementation**: Agent must implement `WriteSession(AgentSession)` to restore sessions
+- [ ] **File-based agents** (Claude, Gemini): Write `NativeData` to `SessionRef` path
+- [ ] **Database-backed agents**: Write `NativeData` to file, then import into native storage (the native format should be what the agent's import command expects)
+- [ ] **Single format per agent**: Store only the agent's native format in `NativeData` - no separate fields for different representations of the same data
+
+### Hook Events
+
+Map agent-native hooks to these `EventType` constants (see `agent/event.go`):
+
+- [ ] **TurnStart**: Fire when user submits a prompt (for pre-prompt state capture)
+- [ ] **TurnEnd**: Fire when agent finishes responding (for checkpoint creation)
+- [ ] **SessionStart**: Fire when a new session begins
+- [ ] **SessionEnd**: Fire when session is explicitly ended (optional but recommended)
+
+### Rewind/Resume Support
+
+- [ ] **Rewind restores full state**: After rewind, agent can continue from that point with full context
+- [ ] **Resume command**: `FormatResumeCommand()` returns the CLI command to resume a session
+- [ ] **Session ID preservation**: Restored sessions maintain original session ID where possible
+
+### Testing
+
+- [ ] **New session**: Create session, multiple turns, verify full transcript at each checkpoint
+- [ ] **Resumed session**: Resume existing session, add turns, verify checkpoint includes historical messages
+- [ ] **Rewind**: Rewind to earlier checkpoint, verify agent can continue from that state
+- [ ] **Agent shutdown**: Verify graceful handling if agent exits during checkpoint