✓ PASS

pydantic-ai 2.61.0

stream.utf8-split · gemini

Requirements

Id	Level	Status	Evidence
text-reported	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉" (primary); truth.text="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉"
no-replacement-chars	MUST	SATISFIED	text.value="Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉" (primary); U+FFFD count=0

What the provider sent

Finish: stop
Raw finish: STOP
Text: Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉
Tool calls: []
Usage: { "alternatives": {}, "cached_input": null, "input": 20, "output": 16, "raw": { "candidatesTokenCount": 16, "promptTokenCount": 20, "promptTokensDetails": [ { "modality": "TEXT", "tokenCount": 20 } ], "serviceTier": "standard", "totalTokenCount": 36 }, "reasoning": null, "total": 36 }
Stream completed: true
Error: null

Wire excerpt

status: 200
content-type: text/event-stream
body (chunks_b64):
ZGF0YTogeyJjYW5kaWRhdGVzIjogW3siY29udGVudCI6IHsicGFydHMiOiBbeyJ0ZXh0IjogIkNhZsM=
qSJ9XSwicm9sZSI6ICJtb2RlbCJ9LCJpbmRleCI6IDB9XSwidXNhZ2VNZXRhZGF0YSI6IHsicHJvbXB0VG9rZW5Db3VudCI6IDIwLCJjYW5kaWRhdGVzVG9rZW5Db3VudCI6IDIsInRvdGFsVG9rZW5Db3VudCI6IDIyLCJwcm9tcHRUb2tlbnNEZXRhaWxzIjogW3sibW9kYWxpdHkiOiAiVEVYVCIsInRva2VuQ291bnQiOiAyMH1dLCJzZXJ2aWNlVGllciI6ICJzdGFuZGFyZCJ9LCJtb2RlbFZlcnNpb24iOiAiZ2VtaW5pLTMuNS1mbGFzaC1saXRlIiwicmVzcG9uc2VJZCI6ICJmZ1RPYXJpN05ZemdqTWNQM0p6cW9BMCJ9DQoNCmRhdGE6IHsiY2FuZGlkYXRlcyI6IFt7ImNvbnRlbnQiOiB7InBhcnRzIjogW3sidGV4dCI6ICIgWsM=
vHJpY2gg4g==
gJQgzrrOsc67zrfOvM6tz4HOsSEg5g==
nbHkuqzjgafkvJrjgYTjgb7jgZfjgofjgYYg8A==
n4w=
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

What the library reported

Outcome

returned

Finish

{
  "raw": "STOP",
  "source": "ModelResponse.finish_reason",
  "surface": "primary",
  "value": "stop"
}

Text

Value: Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉
Surface: primary

Tool calls

[]

Usage

{
  "cached_input": 0,
  "input": 20,
  "output": 16,
  "reasoning": 0,
  "surface": {
    "cached_input": "primary",
    "input": "primary",
    "output": "primary",
    "reasoning": "primary",
    "total": "primary"
  },
  "total": 36
}

Stream

{
  "chunks_seen": 6,
  "completed": true,
  "used": true
}

Error

null

Unsupported reason

null

Full observation JSON

{
  "elapsed_ms": 223.48461113870144,
  "error": null,
  "finish": {
    "raw": "STOP",
    "source": "ModelResponse.finish_reason",
    "surface": "primary",
    "value": "stop"
  },
  "format": "wiretruth.observation/v1",
  "library": {
    "api": "Agent.run_stream_events",
    "language": "python",
    "name": "pydantic-ai",
    "version": "2.61.0"
  },
  "notes": [],
  "outcome": "returned",
  "stream": {
    "chunks_seen": 6,
    "completed": true,
    "used": true
  },
  "structured": {
    "attempted": false,
    "returned_as_success": false,
    "value": null
  },
  "text": {
    "surface": "primary",
    "value": "Café Zürich — καλημέρα! 東京で会いましょう 🌸🎉"
  },
  "tool_calls": [],
  "unsupported_reason": null,
  "usage": {
    "cached_input": 0,
    "input": 20,
    "output": 16,
    "reasoning": 0,
    "surface": {
      "cached_input": "primary",
      "input": "primary",
      "output": "primary",
      "reasoning": "primary",
      "total": "primary"
    },
    "total": 36
  }
}

Fixture

derived gemini/stream.utf8-split

Provenance	Value
Transform	rechunk_inside_utf8
Source fixture	gemini/stream.utf8
Rationale	A network chunk boundary splits a multi-byte UTF-8 character.
Evidence	https://github.com/langchain-ai/langchainjs/issues/5285

Reproduce

wiretruth serve gemini/stream.utf8-split

Plain-library snippet from the shim manifest.

GoogleModel(model, provider=GoogleProvider(base_url=WIRETRUTH_BASE_URL_GEMINI, api_key=WIRETRUTH_API_KEY)); host root

Upstream

No matching upstream report.

History

Version	Grade
2.61.0	✓ PASS
2.56.0	✓ PASS