PR_AGENT.MODEL environment variable seems ignored when using Gemini models

[nitr0yukkuri]

Git provider

Github Cloud

System Info

GitHub Actions on ubuntu-latest runner

Bug details

Hi CodiumAI team,

I'm trying to use the PR Agent with Google's Gemini models via GitHub Actions, but it seems the PR_AGENT.MODEL environment variable is being ignored. Even when I set it to "gemini-pro" or "gemini-1.5-pro-latest" and provide a GOOGLE_API_KEY, the agent attempts to use OpenAI models (gpt-5-2025-08-07, o4-mini) and fails with an authentication error.

Steps to Reproduce:

Set up a workflow using Codium-ai/pr-agent@v0.30 (or @main).

Configure secrets for GOOGLE_API_KEY.

Set the following environment variables in the action step:

GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}

PR_AGENT.MODEL: "gemini-1.5-pro-latest" (also tried "gemini-pro")

PR_AGENT.LANGUAGE: "japanese"

Trigger the workflow on a pull request (opened or synchronize).

Expected Behavior:

The PR Agent should use the specified Gemini model (gemini-1.5-pro-latest) with the provided GOOGLE_API_KEY.

Actual Behavior:

The action fails. The logs show that the agent tries to fall back to OpenAI models and encounters an authentication error:

コード スニペット

{"text": "Generating prediction with gpt-5-2025-08-07\n", ...}
{"text": "Error during LLM inference: litellm.AuthenticationError: ... OpenAIException - Incorrect API key provided: dummy_key....\n", ...}
{"text": "Failed to generate prediction with gpt-5-2025-08-07\n", ...}
{"text": "Generating prediction with o4-mini\n", ...}
{"text": "Error during LLM inference: litellm.AuthenticationError: ... OpenAIException - Incorrect API key provided: dummy_key....\n", ...}
{"text": "Failed to generate prediction with o4-mini\n", ...}
{"text": "Error generating PR description ... Failed to generate prediction with any model of ['gpt-5-2025-08-07', 'o4-mini']\n", ...}
Workflow Configuration:

YAML

jobs:
code-review:
runs-on: ubuntu-latest
permissions:
pull-requests: write
issues: write
contents: read

steps:
  - name: Checkout code
    uses: actions/checkout@v4
    with:
      fetch-depth: 0

  - name: Run CodiumAI PR-Agent Review
    id: pr_agent_review
    uses: Codium-ai/pr-agent@v0.30 # Also tried @main
    env:
      GITHUB_CONTEXT: ${{ toJson(github) }}
      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      GOOGLE_API_KEY: ${{ secrets.GOOGLE_API_KEY }}
      PR_AGENT.MODEL: "gemini-1.5-pro-latest" # Also tried "gemini-pro"
      PR_AGENT.LANGUAGE: "japanese"

  # ... (Discord notification step) ...

Environment:

GitHub Actions

Runner: ubuntu-latest

Action Version: Codium-ai/pr-agent@v0.30 (also tested with @main)

Is this a known issue, or is there something incorrect in my configuration? Any help would be appreciated.

Thanks!

[qodo-merge-for-open-source]

💡 Auto-generated documentation-based answer:

Your workflow env keys don’t match PR‑Agent’s expected names for model/provider. In GitHub Actions you should:

1. Use the config.model key with the correct Gemini model prefix:

   • Set: config.model: "gemini/gemini-1.5-pro" (or "gemini/gemini-1.5-flash")
     Optionally: config.fallback_models: '["gemini/gemini-1.5-pro"]'

2. Provide the Gemini API key with the expected env name:

   • GOOGLE_AI_STUDIO.GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}
     (GOOGLE_API_KEY or PR_AGENT.MODEL won’t be read by PR‑Agent)

3. Remove OPENAI_KEY unless you intend to use OpenAI fallbacks.

Minimal working example (from docs):

• GHA env:
  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
  config.model: "gemini/gemini-1.5-flash"
  config.fallback_models: '["gemini/gemini-1.5-flash"]'
  GOOGLE_AI_STUDIO.GEMINI_API_KEY: ${{ secrets.GEMINI_API_KEY }}

Notes:

• Model identifiers must include the provider prefix “gemini/…”.
• Environment variable format uses dotted keys (or double underscores), e.g., config.model, not PR_AGENT.MODEL.
• See “Changing a model” and the GitHub Actions “Gemini Setup” sections for exact names.

If you prefer Vertex AI instead of AI Studio, configure model as "vertex_ai/…" and set vertex credentials (GOOGLE_APPLICATION_CREDENTIALS or [vertexai] block).

Relevant Sources:

• https://qodo-merge-docs.qodo.ai//installation/github#configuration-examples
• https://qodo-merge-docs.qodo.ai//usage-guide/changing_a_model#google-ai-studio
• https://qodo-merge-docs.qodo.ai//usage-guide/automations_and_usage#github-action
• https://qodo-merge-docs.qodo.ai//usage-guide/changing_a_model#changing-a-model-in-pr-agent