NousResearch/hermes-agent · error · ValueError

Codex Responses input[{idx}] function_call_output is missing

Error message

Codex Responses input[{idx}] function_call_output is missing call_id.

What it means

Error "Codex Responses input[{idx}] function_call_output is missing call_id." thrown in NousResearch/hermes-agent.

Source

Thrown at agent/codex_responses_adapter.py:760

                arguments = json.dumps(arguments, ensure_ascii=False)
            elif not isinstance(arguments, str):
                arguments = str(arguments)
            arguments = sanitize_text(arguments.strip() or "{}")

            normalized.append(
                {
                    "type": "function_call",
                    "call_id": call_id.strip(),
                    "name": name.strip(),
                    "arguments": arguments,
                }
            )
            continue

        if item_type == "function_call_output":
            call_id = item.get("call_id")
            if not isinstance(call_id, str) or not call_id.strip():
                raise ValueError(f"Codex Responses input[{idx}] function_call_output is missing call_id.")
            output = item.get("output", "")
            if output is None:
                output = ""
            # Output may be a string OR an array of structured content
            # items (input_text / input_image) for multimodal tool results.
            # Both shapes are accepted by the Responses API. We preserve
            # the array form when present.
            if isinstance(output, list):
                # Validate each item is a recognised content shape; drop
                # anything else to avoid 4xx from the API.
                cleaned: List[Dict[str, Any]] = []
                for part in output:
                    if not isinstance(part, dict):
                        continue
                    ptype = part.get("type")
                    if ptype == "input_text":
                        text = part.get("text")
                        if isinstance(text, str) and text:

View on GitHub (pinned to c896c09c42)

Solutions

1. Include call_id on every function_call_output item so it pairs with its call.
2. Repair the history entry whose tool output lost its call_id.

When it happens

Trigger: Thrown at agent/codex_responses_adapter.py:760 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of NousResearch/hermes-agent@c896c09c42 (2026-08-14). Data as JSON: /api/errors/c87ce0a544a651cc. Report an issue: GitHub.