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deepseek-harness/packages/ui/acp/snapshot-replay.md
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# ACP Snapshot Replay
This graph explains what a snapshot scenario proves: recorded real-model session logs are replayed keylessly, ACP stdout is normalized and diffed, and scenario workspaces preserve tool side effects that the UI stream alone cannot prove.
```mermaid
sequenceDiagram
participant Recorder as Real API recording
participant Fixture as snapshot fixture
participant Workspace
participant Replay as llm-replay adapter
participant ACP as acp-agent subprocess
participant Expected as stdout expected output
Recorder->>Fixture: session.jsonl + workspace inputs
Fixture->>Workspace: seed files and hook configs
Fixture->>Replay: recorded StreamChunk script
Replay->>ACP: deterministic <code>llm/stream</code> chunks
ACP->>Workspace: bash, fs, and hook side effects
ACP->>Expected: normalized sessionUpdate stream
Expected-->>ACP: diff must be empty
```
The fs and hook snapshot matrix is valuable because it proves world state, hook decisions, and failed tool-card rendering, not just that replay returns text.
Maintenance mode: curated Mermaid sequence based on the snapshot test harness.