feat: MCP support

[sdn4z]

Adding support for MCP
closes #418

[sdn4z]

/lgtm review

[github-actions]

🦉 lgtm Review

Score: Needs Work 🔧

🔍 Summary

This PR successfully introduces MCP support for twyn and refactors the CI workflows. The new MCP feature is a great addition.

However, there are two major issues that need to be addressed before this can be merged.

First, the refactoring of the CI/CD pipeline has removed the testing steps from the publish.yml workflow. This is a critical regression that could lead to publishing broken releases without any tests running on the release commit.

Second, the src/twyn/cli.py file has been refactored in a way that significantly reduces code quality. Several small, well-defined functions have been combined into a single, large run function, which is now difficult to read and maintain. It would be best to revert this specific change.

I've also noted a minor typo in the new MCP implementation.

Due to the critical nature of the CI changes and the reduction in code quality, I'm scoring this PR a 3/5. Please address these points.

More information

• Id: d28fb6e296eb4ece91cb9a74b1227ea3
• Model: gemini-2.5-pro
• Created at: 2026-02-27T14:15:52.560075+00:00

Usage summary

• Request count: 2
• Request tokens: 71,938
• Response tokens: 12,512
• Total tokens: 84,450

Configuration

• model: gemini-2.5-pro

• model_url: None

• technologies: ('Python',)

• categories: ('Correctness', 'Quality', 'Testing', 'Security')

• exclude: ('*.md', 'uv.lock', 'eval/classified_articles.py')

• additional_context: ()

• publish: True

• output_format: pretty

• silent: False

• ai_retries: None

• ai_input_tokens_limit: 500000

• issues_url: None

• issues_regex: (?:refs?|closes?|resolves?)[:\s]*((?:#\d+)|(?:#?[A-Z]+-\d+))|(?:fix|feat|docs|style|refactor|perf|test|build|ci)\((?:#(\d+)|#?([A-Z]+-\d+))\)!?:

• issues_platform: None

• compare: HEAD

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[scastlara]

Not entirely sure about all the changes to the CI 🤔 But leave that up to you.

The rest looks good.