Three related provisioning fixes:
1. **tools.exec.host auto-configuration**: Add `_tools_exec_host_patch()`
that ensures `tools.exec.host` is set to `"gateway"` during
`patch_agent_heartbeats()`. Without this, heartbeat-driven agents
cannot execute `curl`, `bash`, or any shell command — making
HEARTBEAT.md instructions unexecutable. The function is idempotent
and respects existing user configuration.
2. **agents.update hot-reload race**: After `agents.create` writes to
disk, the gateway triggers a ~500ms debounced hot-reload. If
`agents.update` arrives before the reload completes, it returns
"agent not found". Fix: add a 750ms delay after create + exponential
backoff retry (5 attempts, 0.5s → 4s) on the update call.
3. **Skip no-op config.patch**: When `patch_agent_heartbeats()` detects
no changes to agents, channels, or tools config, skip the
`config.patch` RPC entirely. Each unnecessary patch triggers a
gateway SIGUSR1 restart that rotates agent tokens and breaks active
sessions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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