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Agent Summary (Background Progress)

Observed in: Claude Code internal architecture Model: Small fast model (Haiku)

Purpose

Generates periodic background progress updates for sub-agents running in coordinator mode. Provides the parent agent with real-time awareness of what each worker is doing.

Prompt (Reconstructed from Source Analysis)

Summarize what the agent is currently doing in 1 short sentence. Use present tense.
Focus on the specific action, not the overall task.

Good: "Reading the authentication middleware to understand token validation"
Good: "Running pytest on the user service after fixing the import error"
Bad: "Working on the task" (too vague)
Bad: "The agent is currently in the process of examining..." (too verbose)

Design Constraints

  • Single sentence: Maximum one sentence, present tense
  • Action-specific: Describe the current action, not the overall goal
  • No meta-commentary: Don't describe the agent itself, describe what it's doing
  • Present tense: Always use present-tense verbs ("Reading", "Running", "Fixing")

Integration Points

  • Runs on a periodic timer during coordinator mode
  • Results are displayed in the coordinator's status view
  • Helps the lead agent decide when to check in on workers
  • Fires only when sub-agents are actively executing tool calls