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docs(case-study): Deep analysis of issue #102 - google/gemini-3-pro Internal Error #103

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@konard konard commented Dec 24, 2025 •
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Summary

This PR provides a comprehensive case study analysis of issue #102, which reports an "Internal error encountered" failure when using the google/gemini-3-pro model.

Fixes #102

What's Included

Case Study Document (docs/case-studies/issue-102/README.md)

  • Timeline Reconstruction: Detailed sequence of events from the verbose log (~18 seconds from start to failure)
  • Technical Analysis:
    • Authentication flow (OAuth + Cloud Code API)
    • Model mapping (gemini-3-pro → gemini-3-pro-preview)
    • URL transformation to cloudcode-pa.googleapis.com
    • Request/response body transformation
  • Root Cause Analysis: Multiple possible causes ranked by likelihood:
    1. Cloud Code API service issues (most likely)
    2. Gemini 3 Pro Preview model capacity constraints
    3. Rate limiting or capacity issues
    4. OAuth token or permission issues
  • Proposed Solutions:
    • Immediate workarounds (set fallback API key, use alternative model)
    • Long-term code improvements (enhanced error handling, automatic model fallback, retry strategy improvements)
  • References: Links to official documentation, related issues, and code references

Verbose Log (docs/case-studies/issue-102/verbose-log.txt)

Complete verbose output from the user's session showing the full authentication and API call sequence.

Key Findings

  1. The 500 Internal Error comes from Google's Cloud Code API (cloudcode-pa.googleapis.com), not the agent itself
  2. The error is consistent with known issues reported in the official Gemini CLI repository
  3. The fallback to direct API key wasn't available because the user didn't configure one
  4. Gemini 3 Pro is currently in "preview" status with potentially restricted capacity

Recommended Immediate Actions for Users

  1. Set a fallback API key: export GEMINI_API_KEY="your-key"
  2. Use gemini-3-flash-preview as an alternative with better availability
  3. Wait and retry if the issue is transient

Test Plan

  • Verbose log downloaded and preserved
  • Online research completed for related issues
  • Case study document created with all findings
  • References verified

🤖 Generated with Claude Code

@konard
Initial commit with task details
cefa607 
Adding CLAUDE.md with task information for AI processing.
This file will be removed when the task is complete.

Issue: #102
@konard konard self-assigned this Dec 24, 2025
@konard @claude
docs(case-study): Add comprehensive analysis of issue #102
1dcf746 
Add deep case study analysis for the google/gemini-3-pro
"Internal error encountered" issue, including:

- Timeline reconstruction from verbose logs
- Technical analysis of Cloud Code API routing
- Root cause analysis with multiple possible causes
- Proposed solutions (immediate workarounds and long-term fixes)
- References to related issues and documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@konard konard changed the title [WIP] google/gemini-3-pro: Failed after 3 attempts. Last error: Internal error encountered. docs(case-study): Deep analysis of issue #102 - google/gemini-3-pro Internal Error Dec 24, 2025
konard and others added 3 commits December 24, 2025 23:48
@konard @claude
chore: add changeset for issue #102 case study
bd7cfec 
🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@konard @claude
style: format markdown files with prettier
411927b 
🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@konard @claude
chore: remove task-specific CLAUDE.md file
b28d3f9 
This file was created for the AI issue solver task and
should not be part of the repository.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
@konard konard marked this pull request as ready for review December 24, 2025 22:57
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konard commented Dec 24, 2025

🤖 Solution Draft Log

This log file contains the complete execution trace of the AI solution draft process.

💰 Cost estimation:

  • Public pricing estimate: $5.371681 USD
  • Calculated by Anthropic: $4.695782 USD
  • Difference: $-0.675899 (-12.58%)
    📎 Log file uploaded as GitHub Gist (902KB)
    🔗 View complete solution draft log

Now working session is ended, feel free to review and add any feedback on the solution draft.

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google/gemini-3-pro: Failed after 3 attempts. Last error: Internal error encountered.

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