bug(gateway): AttributeError 'NoneType' object has no attribute 'get' on Anthropic adapter via Mattermost gateway

[nericervin]

Description

After updating to the latest main (commit 7e60b092), all Mattermost gateway bots fail with:

⚠️  API call failed (attempt 1/3): AttributeError
   🔌 Provider: anthropic  Model: claude-sonnet-4-6
   🌐 Endpoint: https://api.anthropic.com
   📝 Error: 'NoneType' object has no attribute 'get'
   ⏱️  Elapsed: 0.00s  Context: 4 msgs, ~9,865 tokens

The error occurs before the HTTP request is sent (Elapsed: 0.00s), suggesting it happens during request construction in the Anthropic adapter or prompt builder.

Environment

• Platform: Mattermost gateway (Docker)
• Provider: Anthropic (direct, ANTHROPIC_API_KEY)
• Models: claude-sonnet-4-6, claude-opus-4-6
• Previous working version: v0.8.0 (commit 86960cdb)
• Broken since: latest main (7e60b092)

Reproduction

1. Configure Hermes with Mattermost gateway
2. Set model.default: claude-sonnet-4-6 and model.provider: anthropic
3. Send any message to the bot via Mattermost
4. Bot fails with the AttributeError above, falls back to fallback model

What works

• Direct Anthropic API calls from the same container (using anthropic.Anthropic().messages.create()) work fine
• _resolve_runtime_agent_kwargs() correctly resolves provider: anthropic, base_url: https://api.anthropic.com, api_mode: anthropic_messages
• Creating an AIAgent manually with those resolved kwargs and calling run_conversation() works
• The issue only appears when the Mattermost gateway creates the agent

What doesn't work

• Any message via Mattermost gateway → AttributeError before API call
• Tested with completely clean state.db (0 messages) — same error
• Tested with only 4 messages in context — same error
• All 4 bots (Kellu/Sonnet, Werken/Sonnet, Nometun/Opus, Dewun/Opus) affected

Workaround

Rolled back to pre-update commit (260dfec1, based on v0.8.0) which works correctly.

Config

model:
  default: "claude-sonnet-4-6"
  provider: "anthropic"

fallback_model:
  provider: openrouter
  model: meta-llama/llama-4-maverick

[konsisumer]

This looks like the crash fixed by #7350 (merged 2026-04-10, ~30 minutes after this issue was filed).

Root cause: feat: add Anthropic Fast Mode support to /fast command (#7037) introduced self.request_overrides.get("speed") in _build_api_kwargs, but the gateway path goes through GatewayRunner._resolve_turn_agent_config, which sets route["request_overrides"] = None when no service_tier is configured. The direct-run path passed request_overrides={} by default so the crash only surfaced via the gateway — matching exactly what you saw (Mattermost only, fails at 0.00s before HTTP, manual AIAgent(...) worked).

The fix in run_agent.py normalizes with (self.request_overrides or {}).get("speed") == "fast", which is on main now.

Can you pull latest main and confirm Mattermost is unblocked? If the AttributeError is gone this can be closed.

[nericervin]

Confirmado, el fix de #7350 (mergeado el 2026-04-10) destrabó Mattermost. Pulleamos main el 11-abr y todos nuestros bots (Kellu, Werken, Nometun, Dewun) están funcionando sin AttributeError desde entonces. Cerrando.

[alt-glitch]

Likely duplicate of #7215 — same AttributeError: 'NoneType' object has no attribute 'get' root cause in fast_mode/request_overrides handling. Fix merged in #7350.