Function _parse_json

src/agent/plan_execute/executor.py:225–251

Extract a JSON object from an LLM response, with markdown fence handling. Returns the parsed dict, or None if no JSON object could be extracted. An empty dict ``{}`` is a valid successful parse (e.g. for no-arg tools).

(raw: str)

def _parse_json(raw: str) -> dict | None:
    """Extract a JSON object from an LLM response, with markdown fence handling.

    Returns the parsed dict, or None if no JSON object could be extracted.
    An empty dict ``{}`` is a valid successful parse (e.g. for no-arg tools).
    """
    text = raw.strip()
    if text.startswith("```"):
        lines = text.splitlines()
        inner = lines[1:-1] if lines[-1].strip() == "```" else lines[1:]
        text = "\n".join(inner).lstrip("json").strip()
    try:
        result = json.loads(text)
        if isinstance(result, dict):
            return result
    except json.JSONDecodeError:
        pass
    start, end = text.find("{"), text.rfind("}") + 1
    if start != -1 and end > start:
        try:
            result = json.loads(text[start:end])
            if isinstance(result, dict):
                return result
        except json.JSONDecodeError:
            pass
    _log.debug("_parse_json: could not extract a JSON object from: %r…", raw[:120])
    return None


# ── MCP protocol helpers ──────────────────────────────────────────────────────