agentation-context — UserPromptSubmit (in dispatcher) → SessionStart

Interactive playground for M104 PR-B (follow-up to the #1234 audit). Same pattern as PR-A (#1825): toggle the .mcp.json state and the turn count to see the envelopes side-by-side.

before Inside prompt/unified-dispatcher


      

        fires
        file I/O
        session cost
      

      
Wired as runOnce: true inside the UPS dispatcher. The runOnce flag is a per-session file probe — runs every prompt, file-flag short-circuits after turn 1. The reminder still re-injects until the flag lands.

    


    

      
after SessionStart (cached prefix)

      

      

        fires
        file I/O
        session cost
      

      
Standalone SessionStart entry (async, 5s). One .mcp.json read at session boot; reminder pins to cached prompt prefix. No flag-file dance. PR #1822 made this safe by allow-listing SessionStart in the output-guard.