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Session Message Scanning - Implementation Summary

What Was Done

Added session message scanning to the compaction hook to detect swarm activity by examining actual tool calls in the conversation, not just .hive/ state.

Files Modified

packages/opencode-swarm-plugin/examples/plugin-wrapper-template.ts

1. Module-level SDK client (line 73)

let sdkClient: any = null;

2. SDK client initialization (line 1662)

sdkClient = input.client;

3. SessionScanResult interface (lines 1334-1343)

interface SessionScanResult {
  messageCount: number;
  toolCalls: Array<{
    toolName: string;
    args: Record<string, unknown>;
    output?: string;
  }>;
  swarmDetected: boolean;
  reasons: string[];
}

4. scanSessionMessages() function (lines 1351-1491)

  • Fetches session messages via SDK client
  • Scans message parts for tool calls
  • Classifies tools by confidence level
  • Returns scan result with detection status

5. Compaction hook integration (lines 1922-2003)

  • Step 1: Scan session messages
  • Step 2: Detect from hive cells (existing)
  • Step 3: Merge results and boost confidence

New Files

SESSION_MESSAGE_SCANNING.md

  • Complete documentation
  • Tool classification reference
  • Example scenarios
  • Future enhancement ideas

Key Features

Tool Classification

High Confidence (definite swarm):

  • hive_create_epic
  • swarm_decompose
  • swarm_spawn_subtask
  • swarm_complete
  • swarmmail_init
  • swarmmail_reserve

Medium Confidence (active swarm):

  • hive_start, hive_close
  • swarm_status, swarm_progress
  • swarmmail_send

Low Confidence (possible swarm):

  • hive_create
  • hive_query

Confidence Boosting Logic

Session has HIGH-confidence tools + Hive is none/low → Boost to HIGH
Session has ANY swarm tools + Hive is none → Boost to MEDIUM
Session has ANY swarm tools + Hive is low → Boost to MEDIUM

Observability

New log events in ~/.config/swarm-tools/logs/compaction.log:

  • session_scan_start - Starting scan
  • session_scan_messages_fetched - Message count
  • session_scan_tool_found - Each swarm tool detected
  • session_scan_complete - Summary with stats
  • confidence_boost_from_session_scan - When boosting confidence
  • final_swarm_detection - Combined result

Testing

Type Safety

bun run typecheck  # ✓ 0 errors

Logic Tests

All 5 test cases passed:

  • Empty messages → no detection
  • High-confidence tool → detected with high confidence
  • Low-confidence tool → detected without high confidence
  • Non-swarm tool → no detection
  • Multiple high-confidence tools → detected with count

Edge Cases Handled

  • No SDK client available
  • No messages in session
  • Malformed message parts
  • API errors during fetch

Example Scenario

User initiates swarm decomposition:

User: "Decompose this task for parallel agents"
Agent: swarm_decompose(task="Add auth flow")
[Compaction triggered before hive_create_epic]

OLD BEHAVIOR:

  • detectSwarm() finds no cells in .hive/
  • confidence: "none"
  • No swarm context injected
  • Resumed session loses swarm state

NEW BEHAVIOR:

  • scanSessionMessages() finds swarm_decompose call
  • swarmDetected: true, high-confidence
  • detectSwarm() finds no cells (confidence: "none")
  • Confidence boosted: none → HIGH
  • Swarm context injected
  • Resumed session continues coordination

Next Steps

  1. Deploy: Users run swarm setup --reinstall
  2. Monitor: Watch compaction.log for new events
  3. Test: Trigger compaction during swarm decomposition phase
  4. Iterate: Consider enhancements (see SESSION_MESSAGE_SCANNING.md)

Future Enhancements

  1. Tool output inspection - Parse output for error patterns
  2. Agent name extraction - Identify active agents from args
  3. Epic ID extraction - Pull epic ID from tool args
  4. Time-based filtering - Only scan recent messages
  5. Message part analysis - Count assistant vs tool vs user parts

Implementation Philosophy

Err on the side of continuation.

False positive = extra context (low cost, high safety) False negative = lost swarm (high cost, coordination failure)

The session message scan catches early swarm activity (planning, decomposition) before cells are materialized in .hive/. This prevents losing swarm state during compaction in the critical bootstrapping phase.