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fix(copilot): wire live /models max_prompt_tokens into context-window resolver

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The Copilot provider resolved context windows via models.dev static data,
which does not include account-specific models (e.g. claude-opus-4.6-1m
with 1M context). This adds the live Copilot /models API as a higher-
priority source for copilot/copilot-acp/github-copilot providers.

New helper get_copilot_model_context() in hermes_cli/models.py extracts
capabilities.limits.max_prompt_tokens from the cached catalog. Results
are cached in-process for 1 hour.

In agent/model_metadata.py, step 5a queries the live API before falling
through to models.dev (step 5b). This ensures account-specific models
get correct context windows while standard models still have a fallback.

Part 1 of #7731.
Refs: #7272
This commit is contained in:
NiuNiu Xia 2026-04-20 05:20:55 +00:00 • committed by Teknium
parent d7ad07d6fe
commit 76329196c1
3 changed files with 192 additions and 0 deletions
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13
agent/model_metadata.py
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@ -1308,6 +1308,19 @@ def get_model_context_length(
if inferred:
effective_provider = inferred
# 5a. Copilot live /models API — max_prompt_tokens from the user's account.
# This catches account-specific models (e.g. claude-opus-4.6-1m) that
# don't exist in models.dev. For models that ARE in models.dev, this
# returns the provider-enforced limit which is what users can actually use.
if effective_provider in ("copilot", "copilot-acp", "github-copilot"):
try:
from hermes_cli.models import get_copilot_model_context
ctx = get_copilot_model_context(model, api_key=api_key)
if ctx:
return ctx
except Exception:
pass # Fall through to models.dev
if effective_provider == "nous":
ctx = _resolve_nous_context_length(model)
if ctx: