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fix(provider): make config.yaml model.provider the single source of truth (#31222)

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Policy: if it ain't a secret it goes in config.yaml. HERMES_INFERENCE_PROVIDER
was leaking behavioral config into the .env surface, including from the gateway,
which bypassed config.yaml entirely.

Behavior:
- gateway/run.py: drop HERMES_INFERENCE_PROVIDER read in _resolve_runtime_agent_kwargs.
  Gateway now flows through resolve_runtime_provider() with no `requested` override,
  which reads model.provider from config.yaml first.

Docs/UX (strip env var from user-facing surface):
- --provider help text no longer mentions the env var
- cli-config.yaml.example same
- reference/environment-variables.md: remove HERMES_INFERENCE_PROVIDER row and
  the cross-reference from HERMES_INFERENCE_MODEL
- reference/cli-commands.md: blank the env-var column for --provider
- guides/xai-grok-oauth.md, guides/minimax-oauth.md: replace
  HERMES_INFERENCE_PROVIDER=x hermes invocations with config.yaml / --provider
- developer-guide/adding-providers.md, model-provider-plugin.md: reframe

Internal mechanism (kept as-is):
- hermes_cli/main.py writes HERMES_INFERENCE_PROVIDER into the TUI subprocess env
- tui_gateway/server.py reads it on TUI startup
- resolve_requested_provider() / oneshot.py / cli.py still fall through to the
  env var as a last-resort behind config.yaml, which is what makes the TUI
  parent->child handoff work
This stays. We just stop documenting it as a user knob.

Tests: tests/gateway/test_auth_fallback.py — simplify mock to fail on first
call, succeed on second; drop monkeypatch.setenv lines that no longer matter.

Supersedes #31064 (closed with credit to @novax635 who surfaced the underlying
issue but proposed aligning gateway *to* the env var rather than removing it).
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Teknium 2026-05-23 18:18:41 -07:00 • committed by GitHub
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2
website/docs/reference/cli-commands.md
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@ -138,7 +138,7 @@ Per-run overrides (no mutation to `~/.hermes/config.yaml`):
| Flag | Equivalent env var | Purpose |
|---|---|---|
| `-m` / `--model <model>` | `HERMES_INFERENCE_MODEL` | Override the model for this run |
| `--provider <provider>` | `HERMES_INFERENCE_PROVIDER` | Override the provider for this run |
| `--provider <provider>` | _(none)_ | Override the provider for this run |
```bash
hermes -z "…" --provider openrouter --model openai/gpt-5.5

3
website/docs/reference/environment-variables.md
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@ -113,7 +113,6 @@ For native Anthropic auth, Hermes prefers Claude Code's own credential files whe
| Variable | Description |
|----------|-------------|
| `HERMES_INFERENCE_PROVIDER` | Override provider selection: `auto`, `custom`, `openrouter`, `nous`, `openai-codex`, `copilot`, `copilot-acp`, `anthropic`, `huggingface`, `novita`, `gemini`, `zai`, `kimi-coding`, `kimi-coding-cn`, `minimax`, `minimax-cn`, `minimax-oauth` (browser OAuth login — no API key required; see [MiniMax OAuth guide](../guides/minimax-oauth.md)), `kilocode`, `xiaomi`, `arcee`, `gmi`, `stepfun`, `alibaba`, `alibaba-coding-plan` (alias `alibaba_coding`), `deepseek`, `nvidia`, `ollama-cloud`, `xai` (alias `grok`), `xai-oauth` (browser OAuth login for SuperGrok subscribers — no API key required; see [xAI Grok OAuth guide](../guides/xai-grok-oauth.md)), `google-gemini-cli`, `qwen-oauth`, `bedrock`, `opencode-zen`, `opencode-go`, `ai-gateway`, `tencent-tokenhub` (default: `auto`) |
| `HERMES_PORTAL_BASE_URL` | Override Nous Portal URL (for development/testing) |
| `NOUS_INFERENCE_BASE_URL` | Override Nous inference API URL |
| `HERMES_NOUS_MIN_KEY_TTL_SECONDS` | Min agent key TTL before re-mint (default: 1800 = 30min) |
@ -589,7 +588,7 @@ Advanced per-platform knobs for throttling the outbound message batcher. Most us
| `HERMES_TUI_DIR` | Path to a prebuilt `ui-tui/` directory (must contain `dist/entry.js` and populated `node_modules`). Used by distros and Nix to skip the first-launch `npm install`. |
| `HERMES_TUI_RESUME` | Resume a specific TUI session by ID on launch. When set, `hermes --tui` skips forging a fresh session and picks up the named session instead — useful for re-attaching after a disconnect or terminal crash. |
| `HERMES_TUI_THEME` | Force the TUI color theme: `light`, `dark`, or a raw 6-character background hex (e.g. `ffffff` or `1a1a2e`). When unset, Hermes auto-detects using `COLORFGBG` and terminal background queries; this variable overrides detection on terminals (Ghostty, Warp, iTerm2, etc.) that don't set `COLORFGBG`. |
| `HERMES_INFERENCE_MODEL` | Force the model for `hermes -z` / `hermes chat` without mutating `config.yaml`. Pairs with `HERMES_INFERENCE_PROVIDER`. Useful for scripted callers (sweeper, CI, batch runners) that need to override the default model per run. |
| `HERMES_INFERENCE_MODEL` | Force the model for `hermes -z` / `hermes chat` without mutating `config.yaml`. Pairs with the `--provider` flag. Useful for scripted callers (sweeper, CI, batch runners) that need to override the default model per run. |
## Session Settings