Add pricing for Gemini 3.1 Pro Preview Custom Tools

[mike1858]

Equivalent pricing to Gemini 3.1 Pro Preview.

Closes #147.

Summary by CodeRabbit

• New Features
  • Added support for the Gemini 3.1 Pro Preview Customtools model variant with verified pricing for inputs, outputs, and cache operations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f779056f-2943-446a-b470-3b57b14694d2

📥 Commits

Reviewing files that changed from the base of the PR and between 2ab8f58 and 928f3bc.

📒 Files selected for processing (1)

• src/models.rs

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📝 Walkthrough

Walkthrough

A new model alias "gemini-3.1-pro-preview-customtools" has been added to map to "gemini-3.1-pro-preview" in the model alias table, along with a corresponding unit test verifying the alias resolves correctly and pricing matches expected values.

Changes

Cohort / File(s)	Summary
Model Alias Addition src/models.rs	Added "gemini-3.1-pro-preview-customtools" alias mapping to "gemini-3.1-pro-preview" with a unit test verifying alias resolution and pricing consistency.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

• feat: add Gemini 3.1 Pro pricing and model aliases #125: Introduced pricing and model aliases for the base gemini-3.1-pro-preview model that this customtools alias points to.
• Add aliases for Gemini 3.1 Pro - low and medium and high #135: Added other gemini-3.1-pro-preview family alias entries to the same MODEL_ALIASES map.
• Add pricing for GPT-5.4 nano and GPT-4.5 #144: Similarly modified the model alias table in src/models.rs and added tests verifying alias-to-pricing mappings.

Poem

🐰 A customtools alias hops into place,
No more warnings in this space!
Gemini 3.1 pro flows through the stream,
Pricing aligned like a rabbit's dream. ✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding pricing support for a specific Gemini model variant.
Linked Issues check	✅ Passed	The PR directly addresses issue #147 by adding the missing pricing alias for gemini-3.1-pro-preview-customtools, resolving the warning about unknown model defaulting to $0.
Out of Scope Changes check	✅ Passed	All changes are directly scoped to resolving the linked issue: adding a model alias mapping and corresponding unit test, with no extraneous modifications.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/gemini-3.1-pro-preview-custom-tools

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