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fix: classify OpenRouter 'no tool use' 404 as model_not_found with fallback

Browse source 
When OpenRouter routes to an endpoint that does not support tool/function
calling, it returns HTTP 404 with the message 'No endpoints found that
support tool use. Try disabling "browser_back".'

The raw error body does not contain 'model not found' or any other
_MODEL_NOT_FOUND_PATTERNS entry, so it falls through to FailoverReason.unknown
with retryable=True. The retry loop wastes 3-5 attempts on the same
deterministic rejection, then surfaces a confusing generic error instead of
automatically failing over to a fallback model or provider.

Adding the OpenRouter phrase to _MODEL_NOT_FOUND_PATTERNS classifies it as
model_not_found (retryable=False, should_fallback=True), which triggers the
client-error fast-fallback path in conversation_loop.py: the agent switches
to a configured fallback model/provider before the user sees the error.

Existing buffered guidance in conversation_loop.py (the 'support tool use'
hint at line ~2967) remains intact and surfaces only if every fallback
exhausts.
This commit is contained in:
webtecnica 2026-07-04 15:51:58 -03:00 • committed by Teknium
parent ddd3a2d247
commit 2bb11adb49
2 changed files with 9 additions and 26 deletions
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9
agent/error_classifier.py
View file

@ -279,6 +279,15 @@ _MODEL_NOT_FOUND_PATTERNS = [
"no such model",
"unknown model",
"unsupported model",
# OpenRouter returns 404 with this message when none of the candidate
# endpoints for the selected model support tool/function calling.
# Classifying this as model_not_found triggers fallback to a different
# model or provider that does support tools. Without this entry the
# pattern falls through to ``unknown`` with ``retryable=True``, the
# retry loop burns all attempts on the same deterministic rejection,
# and the error surfaces as a confusing "model not found" message
# instead of automatically failing over. See PR #58446.
"no endpoints found that support tool use",
]
# Request-validation patterns — the request is malformed and will fail

26
package-lock.json generated
View file

@ -1902,7 +1902,6 @@
"os": [
"aix"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -1919,7 +1918,6 @@
"os": [
"android"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -1936,7 +1934,6 @@
"os": [
"android"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -1953,7 +1950,6 @@
"os": [
"android"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -1970,7 +1966,6 @@
"os": [
"darwin"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -1987,7 +1982,6 @@
"os": [
"darwin"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2004,7 +1998,6 @@
"os": [
"freebsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2021,7 +2014,6 @@
"os": [
"freebsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2038,7 +2030,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2055,7 +2046,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2072,7 +2062,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2089,7 +2078,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2106,7 +2094,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2123,7 +2110,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2140,7 +2126,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2157,7 +2142,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2174,7 +2158,6 @@
"os": [
"linux"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2191,7 +2174,6 @@
"os": [
"netbsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2208,7 +2190,6 @@
"os": [
"netbsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2225,7 +2206,6 @@
"os": [
"openbsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2242,7 +2222,6 @@
"os": [
"openbsd"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2259,7 +2238,6 @@
"os": [
"openharmony"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2276,7 +2254,6 @@
"os": [
"sunos"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2293,7 +2270,6 @@
"os": [
"win32"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2310,7 +2286,6 @@
"os": [
"win32"
],
"peer": true,
"engines": {
"node": ">=18"
}
@ -2327,7 +2302,6 @@
"os": [
"win32"
],
"peer": true,
"engines": {
"node": ">=18"
}