Add Support for Claude Opus 4.1 Model

[ksylvan]

Add Support for Claude Opus 4.1 Model

Summary

This PR refactors the GitHub Actions release workflow to improve build reliability and adds support for the Claude Opus 4.1 model. The main changes include separating the version retrieval into its own job, simplifying OS detection logic, fixing parameter conflicts for Anthropic models, and updating the anthropic-sdk-go dependency.

Files Changed

• .github/workflows/release.yml: Restructured the release workflow to separate concerns and improve maintainability
• cmd/generate_changelog/incoming/1673.txt: Added changelog entry documenting these changes
• go.mod / go.sum: Updated anthropic-sdk-go dependency from v1.4.0 to v1.7.0
• internal/plugins/ai/anthropic/anthropic.go: Added Claude Opus 4.1 model support and fixed parameter handling

Code Changes

Release Workflow Refactoring

The workflow now has a dedicated get_version job that runs before the build:

get_version:
  name: Get version
  runs-on: ubuntu-latest
  outputs:
    latest_tag: ${{ steps.get_version.outputs.latest_tag }}

OS detection has been simplified from a multi-step process to inline ternary operators:

GOOS: ${{ matrix.os == 'ubuntu-latest' && 'linux' || 'darwin' }}

Changelog generation has been moved to a separate update_release_notes job that runs after all builds complete:

update_release_notes:
  needs: [build, get_version]
  runs-on: ubuntu-latest

Anthropic Client Updates

Added support for the new Claude Opus 4.1 model:

string(anthropic.ModelClaudeOpus4_1_20250805),

Fixed temperature/topP parameter conflict issue:

// Only set one of Temperature or TopP as some models don't allow both
if opts.Temperature != 0 {
    params.Temperature = anthropic.Opt(opts.Temperature)
} else if opts.TopP != 0 {
    params.TopP = anthropic.Opt(opts.TopP)
}

Reason for Changes

1. Workflow Reliability: The previous workflow had version retrieval duplicated across matrix jobs, which could lead to race conditions and inefficiencies. Separating this into its own job ensures it runs once and provides consistent output.

2. Claude Opus 4.1 Support: Adding support for the latest Claude model provides users with access to improved AI capabilities.

3. Parameter Conflict Fix: Some Anthropic models don't allow both temperature and topP parameters to be set simultaneously, which was causing API errors.

4. Simplified OS Detection: The previous multi-step OS detection was unnecessarily complex and could be replaced with inline conditionals.

Impact of Changes

• Improved CI/CD Performance: Version retrieval now happens once instead of multiple times across matrix jobs
• Better Error Handling: The temperature/topP fix prevents API errors when using certain Anthropic models
• Enhanced Model Support: Users can now leverage the latest Claude Opus 4.1 model
• Cleaner Workflow: Separation of concerns makes the workflow easier to maintain and debug

Test Plan

1. Verify the workflow runs successfully on push to main branch
2. Confirm version is correctly extracted from nix/pkgs/fabric/version.nix
3. Test that binaries are built for all OS/architecture combinations
4. Verify release notes are properly generated after all builds complete
5. Test Claude Opus 4.1 model integration with various temperature/topP combinations

Additional Notes

• The workflow now has explicit job dependencies (needs: [test, get_version]) ensuring proper execution order
• The changelog generation runs as a final step to avoid conflicts with concurrent build jobs
• The anthropic-sdk-go upgrade from v1.4.0 to v1.7.0 may include additional improvements beyond the Opus 4.1 model support

Potential Issues to Monitor:

• The ternary operator approach for OS detection should be tested across all matrix combinations
• The temperature/topP logic prioritizes temperature when both are set - this behavior should be documented
• The separate update_release_notes job requires all builds to complete successfully before running

[Copilot]

Pull Request Overview

This PR adds support for Claude Opus 4.1 model and refactors the GitHub Actions release workflow to improve build reliability. The main changes include separating version retrieval into a dedicated job, simplifying OS detection logic, and fixing parameter conflicts in the Anthropic client.

• Add Claude Opus 4.1 model support to the Anthropic client
• Fix temperature/topP parameter conflict that was causing API errors
• Refactor GitHub Actions workflow to improve reliability with separated version job

Reviewed Changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
internal/plugins/ai/anthropic/anthropic.go	Added Claude Opus 4.1 model and fixed temperature/topP parameter handling
internal/plugins/ai/anthropic/anthropic_test.go	Added comprehensive tests for parameter handling logic
internal/domain/domain.go	Added default constants for chat parameters
internal/cli/flags.go	Added comment about parameter defaults consistency
go.mod	Updated anthropic-sdk-go from v1.4.0 to v1.7.0
.github/workflows/release.yml	Refactored workflow with dedicated version job and simplified OS detection
cmd/generate_changelog/incoming/1673.txt	Added changelog entry for the changes
.vscode/settings.json	Added "Keploy" to spell check dictionary