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125de02056
Fixes #15779. Custom-provider per-model context_length (`custom_providers[].models.<id>.context_length`) is now honored across every resolution path, not just agent startup. Also adds 256K as the top probe tier and default fallback. ## What changed New helper `hermes_cli.config.get_custom_provider_context_length()` — single source of truth for the per-model override lookup, with trailing-slash-insensitive base-url matching. `agent.model_metadata.get_model_context_length()` gains an optional `custom_providers=` kwarg (step 0b — runs after explicit `config_context_length` but before every other probe). Wired through five call sites that previously either duplicated the lookup or ignored it entirely: - `run_agent.py` startup — refactored to use the new helper (dedups legacy inline loop, keeps invalid-value warning) - `AIAgent.switch_model()` — re-reads custom_providers from live config on every /model switch - `hermes_cli.model_switch.resolve_display_context_length()` — new `custom_providers=` kwarg - `gateway/run.py` /model confirmation (picker callback + text path) - `gateway/run.py` `_format_session_info` (/info) ## Context probe tiers `CONTEXT_PROBE_TIERS = [256_000, 128_000, 64_000, 32_000, 16_000, 8_000]` — was `[128_000, ...]`. `DEFAULT_FALLBACK_CONTEXT` follows tier[0], so unknown models now default to 256K. The stale `128000` literal in the OpenRouter metadata-miss path is replaced with `DEFAULT_FALLBACK_CONTEXT` for consistency. ## Repro (from #15779) ```yaml custom_providers: - name: my-custom-endpoint base_url: https://example.invalid/v1 model: gpt-5.5 models: gpt-5.5: context_length: 1050000 ``` `/model gpt-5.5 --provider custom:my-custom-endpoint` → previously "Context: 128,000", now "Context: 1,050,000". ## Tests - `tests/hermes_cli/test_custom_provider_context_length.py` — new file, 19 tests covering the helper, step-0b integration, and the 256K tier invariants - `tests/hermes_cli/test_model_switch_context_display.py` — added regression tests for #15779 through the display resolver - `tests/gateway/test_session_info.py` — updated default-fallback assertion (128K → 256K) - `tests/agent/test_model_metadata.py` — updated tier assertions for the new top tier