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fix(providers): set User-Agent on ProviderProfile.fetch_models

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Some catalog endpoints (OpenCode Zen, etc.) sit behind a WAF that
returns 403 for the default Python-urllib/<ver> User-Agent.  The
generic profile-based live fetch in providers/base.py was silently
failing for any such provider — falling through to the static catalog
and missing newly-launched models.

Set a generic 'hermes-cli/<version>' UA on the catalog probe so every
api_key provider profile benefits.  Verified live against opencode-zen:
before this change, profile.fetch_models() raised HTTP 403; after, it
returns 42 models including gpt-5.5, gpt-5.5-pro, kimi-k2.6, glm-5.1
and the *-free variants the static catalog doesn't list.

Also strip the now-stale comment in validate_requested_model() claiming
opencode-zen's /models returns 404 against the HTML marketing site —
the API endpoint at /zen/v1/models returns 200 with valid JSON.

Surfaced by #2651 (@aashizpoudel) — fixes the same user-facing gap
their PR targeted, applied at the right layer so all api_key provider
profiles get live catalogs through the same code path.

Co-authored-by: Aashish Poudel <mr.aashiz@gmail.com>
This commit is contained in:
teknium1 2026-05-15 01:38:30 -07:00 • committed by Teknium
parent 647cc0bb0d
commit 5360b54244
3 changed files with 26 additions and 7 deletions
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18
providers/base.py
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@ -21,6 +21,20 @@ logger = logging.getLogger(__name__)
OMIT_TEMPERATURE = object()
def _profile_user_agent() -> str:
"""Return a ``hermes-cli/<version>`` UA string, with a stable fallback.
Used by ``ProviderProfile.fetch_models`` so the catalog probe is not
served the default ``Python-urllib/<ver>`` UA — some providers
(OpenCode Zen, etc.) sit behind a WAF that returns 403 for that.
"""
try:
from hermes_cli import __version__ as _ver # lazy: avoid layer cycle at import time
return f"hermes-cli/{_ver}"
except Exception:
return "hermes-cli"
@dataclass
class ProviderProfile:
"""Base provider profile — subclass or instantiate with overrides."""
@ -153,6 +167,10 @@ class ProviderProfile:
if api_key:
req.add_header("Authorization", f"Bearer {api_key}")
req.add_header("Accept", "application/json")
# Some providers (e.g. OpenCode Zen) sit behind a WAF that blocks
# the default ``Python-urllib/<ver>`` User-Agent. Set a generic
# hermes-cli UA so the catalog endpoint is reachable.
req.add_header("User-Agent", _profile_user_agent())
for k, v in self.default_headers.items():
req.add_header(k, v)