✓ PASS
vercel-ai 7.0.153
truncation.tool-call-args · openai-responses
Requirements
| Id | Level | Status | Evidence |
|---|---|---|---|
| no-complete-partial-call | MUST | SATISFIED | outcome=returned; error signalled |
| cause-is-truncation | MUST | SATISFIED | finish.value="length" (primary: result.finishReason); truth.finish="length"; error.category="validation"; structured.returned_as_success=false |
What the provider sent
- Finish
- length
- Raw finish
- max_output_tokens
- Text
null
- Tool calls
[ { "arguments": null, "arguments_parsed_ok": false, "arguments_raw": "{\"title\":\"Weekend Pottery Workshop\",\"", "id": "call_lLsu7YMQmuJzYwIjUOdF8uic", "name": "create_event" } ]- Usage
{ "alternatives": {}, "cached_input": 0, "input": 100, "output": 20, "raw": { "input_tokens": 100, "input_tokens_details": { "cache_write_tokens": 0, "cached_tokens": 0 }, "output_tokens": 20, "output_tokens_details": { "reasoning_tokens": 0 }, "total_tokens": 120 }, "reasoning": 0, "total": 120 }- Stream completed
null
- Error
null
Wire excerpt
status: 200
content-type: application/json
body (json):
{
"id": "resp_04ed45eb9c649570006acbfc064e7087d1bc256e42548bb4ae",
"object": "response",
"created_at": 1791753222,
"status": "incomplete",
"access_programs": null,
"background": false,
"billing": {
"payer": "developer"
},
"completed_at": null,
"error": null,
"frequency_penalty": 0.0,
"incomplete_details": {
"reason": "max_output_tokens"
},
"instructions": null,
"max_output_tokens": 20,
"max_tool_calls": null,
"model": "gpt-6-luna",
"moderation": null,
"output": [
{
"id": "fc_04ed45eb9c649570006acbfc06e08087d1a25f7b11c8d83e05",
"type": "function_call",
"status": "incomplete",
"arguments": "{\"title\":\"Weekend Pottery Workshop\",\"",
"call_id": "call_lLsu7YMQmuJzYwIjUOdF8uic",
"name": "create_event"
}
],
"parallel_tool_calls": true,
"presence_penalty": 0.0,
"previous_response_id": null,
"prompt_cache_key": null,
"prompt_cache_retention": "24h",
"reasoning": {
"context": "all_turns",
"effort": "none",
"mode": "standard",
"summary": null
},
"safety_identifier": null,
"service_tier": "default",
"store": true,
"temperature": 1.0,
"text": {
"format": {
"type": "text"
},
"verbosity": "medium"
},
"tool_choice": "required",
"tool_usage": {
"image_gen": {
"input_tokens": 0,
"input_tokens_details": {
"image_tokens": 0,
"text_tokens": 0
},
"output_tokens": 0,
"output_tokens_details": {
"image_tokens": 0,
"text_tokens": 0
},
"total_tokens": 0
},
"web_search": {
"num_requests": 0
}
},
"tools": [
{
"type": "function",
"description": "Create a calendar event.",
"name": "create_event",
"output_schema": null,
"parameters": {
"type": "object",
"properties": {
"title": {
"type": "string"
},
"date": {
"type": "string",
"description": "YYYY-MM-DD"
},
"city": {
"type": "string"
},
"attendees": {
"type": "array",
"items": {
"type": "string"
}
}
},
"required": [
"title",
"date",
"city",
"attendees"
],
"additionalProperties": false
},
"strict": true
}
],
"top_logprobs": 0,
"top_p": 0.98,
"truncation": "disabled",
"usage": {
"input_tokens": 100,
"input_tokens_details": {
"cache_write_tokens": 0,
"cached_tokens": 0
},
"output_tokens": 20,
"output_tokens_details": {
"reasoning_tokens": 0
},
"total_tokens": 120
},
"user": null,
"metadata": {}
}What the library reported
- Outcome
- returned
- Finish
{ "raw": "max_output_tokens", "source": "result.finishReason", "surface": "primary", "value": "length" }- Text
- Value
- Surface
- primary
- Tool calls
[ { "arguments": null, "arguments_parsed_ok": false, "arguments_raw": "{\"title\":\"Weekend Pottery Workshop\",\"", "id": "call_lLsu7YMQmuJzYwIjUOdF8uic", "name": "create_event" } ]- Usage
{ "cached_input": 0, "input": 100, "output": 20, "reasoning": 0, "surface": { "cached_input": "primary", "input": "primary", "output": "primary", "reasoning": "primary", "total": "primary" }, "total": 120 }- Stream
{ "chunks_seen": null, "completed": null, "used": false }- Error
- Type
- AI_InvalidToolInputError
- Message
- Invalid input for tool create_event: AI_JSONParseError: JSON parsing failed: Text: {"title":"Weekend Pottery Workshop",". Error message: SyntaxError: Unterminated string in JSON at position 37 (line 1 column 38)
- Category
- validation
- Retry after
null
- Stack top
- ai/dist/index.js:4223
- Unsupported reason
null
Full observation JSON
{
"elapsed_ms": 136.23351099999996,
"error": {
"category": "validation",
"message": "Invalid input for tool create_event: AI_JSONParseError: JSON parsing failed: Text: {\"title\":\"Weekend Pottery Workshop\",\".\nError message: SyntaxError: Unterminated string in JSON at position 37 (line 1 column 38)",
"retry_after": null,
"stack_top": "ai/dist/index.js:4223",
"type": "AI_InvalidToolInputError"
},
"finish": {
"raw": "max_output_tokens",
"source": "result.finishReason",
"surface": "primary",
"value": "length"
},
"format": "wiretruth.observation/v1",
"library": {
"api": "generateText",
"language": "javascript",
"name": "vercel-ai",
"version": "7.0.153"
},
"notes": [],
"outcome": "returned",
"stream": {
"chunks_seen": null,
"completed": null,
"used": false
},
"structured": {
"attempted": false,
"returned_as_success": false,
"value": null
},
"text": {
"surface": "primary",
"value": ""
},
"tool_calls": [
{
"arguments": null,
"arguments_parsed_ok": false,
"arguments_raw": "{\"title\":\"Weekend Pottery Workshop\",\"",
"id": "call_lLsu7YMQmuJzYwIjUOdF8uic",
"name": "create_event"
}
],
"unsupported_reason": null,
"usage": {
"cached_input": 0,
"input": 100,
"output": 20,
"reasoning": 0,
"surface": {
"cached_input": "primary",
"input": "primary",
"output": "primary",
"reasoning": "primary",
"total": "primary"
},
"total": 120
}
}Fixture
recorded openai-responses/truncation.tool-call-args
| Provenance | Value |
|---|---|
| Recorded at | 2026-10-11T21:13:42Z |
| Requested model | gpt-6-luna |
| Returned model | gpt-6-luna |
| CI run | https://github.com/kartsan03/wiretruth/actions/runs/38175457862 |
Reproduce
wiretruth serve openai-responses/truncation.tool-call-argsPlain-library snippet from the shim manifest.
createOpenAI({ baseURL: WIRETRUTH_BASE_URL_OPENAI_RESPONSES, apiKey })(model); default Responses entry pointUpstream
No matching upstream report.
History
| Version | Grade |
|---|---|
| 7.0.153 | ✓ PASS |
| 7.0.146 | ✓ PASS |
| 7.0.142 | ✓ PASS |