docs: add /model allowlist troubleshooting note

CHANGELOG.md

@@ -8,6 +8,7 @@ Docs: https://docs.clawd.bot
 - Highlight: Lobster optional plugin tool for typed workflows + approval gates. https://docs.clawd.bot/tools/lobster
 - Memory: prevent CLI hangs by deferring vector probes, adding sqlite-vec/embedding timeouts, and showing sync progress early.
 - Docs: add troubleshooting entry for gateway.mode blocking gateway start. https://docs.clawd.bot/gateway/troubleshooting
+- Docs: add /model allowlist troubleshooting note. (#1405)
 - Docs: add per-message Gmail search example for gog. (#1220) Thanks @mbelinky.
 - Onboarding: remove the run setup-token auth option (paste setup-token or reuse CLI creds instead).
 - Signal: add typing indicators and DM read receipts via signal-cli.

docs/help/troubleshooting.md

@@ -53,6 +53,15 @@ Almost always a Node/npm PATH issue. Start here:
 - [Models](/cli/models)
 - [OAuth / auth concepts](/concepts/oauth)
 
+### `/model` says `model not allowed`
+
+This usually means `agents.defaults.models` is configured as an allowlist. When it’s non-empty,
+only those provider/model keys can be selected.
+
+- Check the allowlist: `clawdbot config get agents.defaults.models`
+- Add the model you want (or clear the allowlist) and retry `/model`
+- Use `/models` to browse the allowed providers/models
+
 ### When filing an issue
 
 Paste a safe report: