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fix(delegation): honor api_mode + auto-detect anthropic_messages URLs (#26824)

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Subagent delegation hardcoded api_mode='chat_completions' for any
delegation.base_url that didn't match three specific hostnames
(chatgpt.com, api.anthropic.com, api.kimi.com/coding), and never
read delegation.api_mode from config. Azure AI Foundry's
https://foundry.services.ai.azure.com/anthropic endpoint fell through
and got chat_completions, causing 404s on every delegate_task call.

The main agent already handles this correctly via the shared
_detect_api_mode_for_url() helper (anything ending in /anthropic →
anthropic_messages); delegation reimplemented its own narrower check.

Reuse the shared detector and honor an explicit delegation.api_mode
when set so users can also force the transport on non-standard
endpoints the URL heuristic can't classify.

Fixes #10213.

Co-authored-by: HiddenPuppy <HiddenPuppy@users.noreply.github.com>
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Teknium 2026-05-16 01:00:27 -07:00 • committed by GitHub
parent 74d0b392e7
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16
tools/delegate_tool.py
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@ -2362,6 +2362,7 @@ def _resolve_delegation_credentials(cfg: dict, parent_agent) -> dict:
configured_provider = str(cfg.get("provider") or "").strip() or None
configured_base_url = str(cfg.get("base_url") or "").strip() or None
configured_api_key = str(cfg.get("api_key") or "").strip() or None
configured_api_mode = str(cfg.get("api_mode") or "").strip().lower() or None
if configured_base_url:
# When delegation.api_key is not set, return None so _build_child_agent
@ -2372,9 +2373,17 @@ def _resolve_delegation_credentials(cfg: dict, parent_agent) -> dict:
# callers to duplicate the key under delegation.api_key.
api_key = configured_api_key # None → inherited from parent in _build_child_agent
# Use the shared URL-based api_mode detector (same path the main agent's
# runtime resolver uses) so Anthropic-compatible direct endpoints with a
# /anthropic suffix — Azure AI Foundry, MiniMax, Zhipu GLM, LiteLLM
# proxies — pick the right transport automatically. Without this,
# subagents would default to chat_completions and hit 404s on endpoints
# that only speak the Anthropic Messages protocol. Fixes #10213.
from hermes_cli.runtime_provider import _detect_api_mode_for_url
base_lower = configured_base_url.lower()
provider = "custom"
api_mode = "chat_completions"
api_mode = _detect_api_mode_for_url(configured_base_url) or "chat_completions"
if (
base_url_hostname(configured_base_url) == "chatgpt.com"
and "/backend-api/codex" in base_lower
@ -2388,6 +2397,11 @@ def _resolve_delegation_credentials(cfg: dict, parent_agent) -> dict:
provider = "custom"
api_mode = "anthropic_messages"
# Explicit delegation.api_mode in config always wins. Lets users force
# a transport for non-standard endpoints the URL heuristic can't detect.
if configured_api_mode in {"chat_completions", "codex_responses", "anthropic_messages"}:
api_mode = configured_api_mode
return {
"model": configured_model,
"provider": provider,