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fix(agent): repair malformed tool_call arguments before API send

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Cherry-picked from PR #12252 by @sirEven.

Models like GLM-5.1 via Ollama can produce malformed tool_call arguments
(truncated JSON, trailing commas, Python None). The existing except
Exception: pass silently passes broken args to the API, which rejects
them with HTTP 400, crashing the session.

Adds a multi-stage repair pipeline at the pre-send normalization point:
1. Empty/whitespace-only → {}
2. Python None literal → {}
3. Strip trailing commas
4. Auto-close unclosed brackets
5. Remove excess closing delimiters
6. Last resort: replace with {} (logged at WARNING)
This commit is contained in:
Severin Bretscher 2026-04-20 05:01:12 -07:00 • committed by Teknium
parent 570f8bab8f
commit 9eeaaa4f1b
1 changed files with 75 additions and 1 deletions
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76
run_agent.py
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@ -9662,7 +9662,81 @@ class AIAgent:
),
}}
except Exception:
pass
# GLM-5.1 and similar models can generate
# malformed tool_call arguments (truncated JSON,
# trailing commas, Python None, etc.). The API
# proxy rejects these with HTTP 400 "invalid tool
# call arguments". Attempt common repairs; if
# all fail, replace with "{}" so the request
# succeeds (better than crashing the session).
raw_args = tc["function"]["arguments"]
repaired = False
raw_stripped = raw_args.strip() if isinstance(raw_args, str) else ""
# Fast-path: empty / whitespace-only → empty object
if not raw_stripped:
tc["function"]["arguments"] = "{}"
repaired = True
logger.warning(
"Sanitized empty tool_call arguments for %s",
tc["function"].get("name", "?"),
)
# Python-literal None → JSON null → normalise to {}
elif raw_stripped == "None":
tc["function"]["arguments"] = "{}"
repaired = True
logger.warning(
"Sanitized Python-None tool_call arguments for %s",
tc["function"].get("name", "?"),
)
if not repaired:
# Attempt common JSON repairs
import re as _re
fixed = raw_stripped
# 1. Strip trailing commas before } or ]
fixed = _re.sub(r',\s*([}\]])', r'\1', fixed)
# 2. Close unclosed structures
open_curly = fixed.count('{') - fixed.count('}')
open_bracket = fixed.count('[') - fixed.count(']')
if open_curly > 0:
fixed += '}' * open_curly
if open_bracket > 0:
fixed += ']' * open_bracket
# 3. Remove extra closing braces/brackets
while True:
try:
json.loads(fixed)
break
except json.JSONDecodeError:
if fixed.endswith('}') and fixed.count('}') > fixed.count('{'):
fixed = fixed[:-1]
elif fixed.endswith(']') and fixed.count(']') > fixed.count('['):
fixed = fixed[:-1]
else:
break
try:
json.loads(fixed)
tc["function"]["arguments"] = fixed
repaired = True
logger.warning(
"Repaired malformed tool_call arguments for %s: %s → %s",
tc["function"].get("name", "?"),
raw_stripped[:80], fixed[:80],
)
except json.JSONDecodeError:
pass
if not repaired:
# Last resort: replace with empty object so the
# API request doesn't crash the entire session.
tc["function"]["arguments"] = "{}"
logger.warning(
"Unrepairable tool_call arguments for %s — "
"replaced with empty object (was: %s)",
tc["function"].get("name", "?"),
raw_stripped[:80],
)
new_tcs.append(tc)
am["tool_calls"] = new_tcs