Module session 

Per-session state: holds the AgentRuntime, working directory, turn counter, transcript, and a [CancellationToken] for cooperative abort for a single ACP session.

AcpSessionManager is a lightweight HashMap-based registry. It is owned by the server’s dispatch loop. No parallel session-management infrastructure exists outside this module — all lifecycle state is tracked through the AgentRuntime and this simple container.

Session persistence (ACP-S1-02)

Sessions are persisted to <persistence_dir>/<session_id>/:

• transcript.jsonl – one JSON line per Message.
• metadata.json – session metadata (system prompt, MCP configs, turn count).

Every message object in the saved transcript has an id field matching the SHA-256 content hash (first 12 hex chars), computed by crate::acp::bridge::sha256_first_12.

Structs

AcpSession

State for one active ACP session.

AcpSessionManager

Registry of active ACP sessions, keyed by SessionId.

CompactionHint

A compaction hint entry, identifying which turn indices are safe to compress.

SavedMessage

A message saved to the JSONL transcript, with a content-hash id field.

SessionMetadata

Metadata saved alongside the session transcript.

SummarizedContext

The result of local transcript summarization (ACP-S1-04).

Functions

apply_compaction_hints

Apply compaction hints to saved messages (sets compressible field).

compute_compaction_hints

Compute compaction hints for a list of saved messages.

summarize_transcript

Produce a summary paragraph of the transcript using a local heuristic.

Type Aliases

SessionId

A unique session identifier.