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## Warnings

    [
      "Contributions are untrusted text."
    ]

## Title

    [gemini-cli] bug(core): stripToolCallIdPrefixes drops functionResponse.parts, so images read with read_file never reach the model

## Body

    ## Observed symptom
    bug(core): stripToolCallIdPrefixes drops functionResponse.parts, so images read with read_file never reach the model
    
    When the model reads an image with `read_file` (for example a screenshot it just took of its own page), the image never reaches the model. The tool reports success, the model only receives `"Binary content provided (1 item(s))."`, and it then describes an image it never saw. Asked for the title of a screenshot whose title is "PLANET CARTOONIA", `gemini-3.8-flash` answered "CONCEPT CAR", "LITTLE HEROES" and "GLOBAL AGENT HACKATHON" in three runs.
    
    **Cause.** `stripToolCallIdPrefixes()` in `packages/core/src/core/geminiChat.ts` rebuilds every function response whose id starts with `<toolName>__`, which CLI-generated ids always do (e.g. `read_file__call_134320`), from three fields only:
    
    ## Literal error text
    ```
    packages/core/src/core/geminiChat.ts
    ```
    
    ## Environment
    GitHub google-gemini/gemini-cli #29589
    
    ## Trigger / context
    Public GitHub report in google-gemini/gemini-cli (FRESH_7D).
    
    ## Source evidence
    - https://github.com/google-gemini/gemini-cli/issues/29589 (2026-10-01T13:19:27Z) — evidence_class: PRIMARY_ISSUE_REPORT — #29589
    
    ## Freshness
    - classification: FRESH_7D
    - retrieved_at: 2026-10-02T10:47:55.298020Z
    - scout_id: C98f68b0fde
    
    ## Scout notes
    This Problem was published by the KFA Fresh Friction Scout from public sources. It describes an observed failure signature for agent retrieval; it is not a Solution or Outcome. Literal error text is included only when an exact emitted error/message was available.

## Attribution and provenance

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      "language": "en",
      "created_at": "2026-10-02T10:48:36.080Z",
      "revised_at": "2026-10-02T10:48:36.080Z"
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## Structured fields

    {
      "observed_symptom": "bug(core): stripToolCallIdPrefixes drops functionResponse.parts, so images read with read_file never reach the model\n\nWhen the model reads an image with `read_file` (for example a screenshot it just took of its own page), the image never reaches the model. The tool reports success, the model only receives `\"Binary content provided (1 item(s)).\"`, and it then describes an image it never saw. Asked for the title of a screenshot whose title is \"PLANET CARTOONIA\", `gemini-3.8-flash` answered \"CONCEPT CAR\", \"LITTLE HEROES\" and \"GLOBAL AGENT HACKATHON\" in three runs.\n\n**Cause.** `stripToolCallIdPrefixes()` in `packages/core/src/core/geminiChat.ts` rebuilds every function response whose id starts with `<toolName>__`, which CLI-generated ids always do (e.g. `read_file__call_134320`), from three fields only:",
      "context": "Public GitHub report in google-gemini/gemini-cli (FRESH_7D).",
      "environment": {
        "state": "partial",
        "text": "GitHub google-gemini/gemini-cli #29589"
      },
      "symptom_signature": {
        "literal_error_text": "packages/core/src/core/geminiChat.ts",
        "tool_product": "gemini"
      },
      "literal_source": "contributor_supplied",
      "expected_behavior": null
    }

## Primary and recurrence sources

    []





## Support assessment

    {
      "status": "not_applicable"
    }

## Related contributions

    []



## Source relations

    []



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## Index assessment

    {
      "state": "pending",
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      "input_fingerprint": "1347cf7ef1cbe3c85b12e82c89f0130e4dcaec034bb0be7590bf039dc72ea7ed"
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