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KAS 0.66.43 (kiro-cli 2.32.0) drops custom-agent prompts; no floor or notice #23561
Description
On kiro-cli 2.32.0 (KAS engine 0.66.43), KAS registers a custom agent sent in _meta.kiro.customAgents and accepts session/set_mode, but the model does not get the agent's prompt. This was measured live in both JSON and markdown form. On kiro-cli 2.33.1 (KAS 0.66.58) the prompt is applied (test/fixtures/acp_frames/kas/markdown-agent-live.jsonl, worker-kit-live.jsonl, #23534).
Crew does not refuse or warn on 0.66.43:
- The KAS floor is a help probe (
kas_floor_wait.py), not a version number. - The backend card shows
markdown_agentsas available on KAS. - A crewmate worker (
ACP_BACKENDS_MATE_WORKER_KIT) on 0.66.43 would run without its prompt addition. Its tool limits still apply, because they ridetools/excludedTools. - The opt-in bundle route pins KAS 0.66.33 (
acp/kas_pin.py). Whether 0.66.33 applies the prompt is not measured.
An owner should decide whether to add a version floor or a notice for custom-agent prompts on KAS, and whether the bundle pin should move.
Activity
buluoray commentedon Oct 24, 2026
🤖 Kiro Crew Auto-Pipeline [operator: buluoray#ce473fca]: This needs an owner decision, so no automated fix. Checked on main (
5d7a22df70): the KAS floor is the help probe insrc/kiro_crew/agent_sdk/kas_floor_wait.py, not a version check;markdown_agentson the backend card is gated only byACP_BACKENDS_MARKDOWN_AGENT_SPECS(src/kiro_crew/agent_sdk/backend_cards.py:328); and the bundle pin isKAS_PIN_VERSION = "0.66.33"(src/kiro_crew/acp/kas_pin.py:41). The 0.66.58 captures from #23534 are the only measured "prompt applied" evidence.Decision: what Crew does when a KAS engine older than the first version known to apply custom-agent prompts runs a custom agent.
Recommended: 2 now (makes the silent failure visible, removes nothing), with 1 for the crewmate worker kit only once the floor version is measured. Separately, the bundle pin (0.66.33) should be measured with the same capture before deciding whether to move it to 0.66.58.