Skip to content

fix: support freeform stopReason in sampling #327

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: main
Choose a base branch
from

Conversation

LucaButBoring
Copy link
Contributor

@LucaButBoring LucaButBoring commented Jun 19, 2025

Supports freeform stop reasons in sampling responses by mapping them to a new UNKNOWN value.

Motivation and Context

Previously, sampling response parsing would fail if a stopReason was provided besides endTurn/stopSequence/maxTokens. This fixes that to map the arbitrary values to UNKNOWN instead.

Spec: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/f5ccad944fdf2b7d9cc70cf817f66ca5a8aa03a4/schema/2024-11-05/schema.ts#L807

How Has This Been Tested?

Unit tests

Breaking Changes

None

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Documentation update

Checklist

  • I have read the MCP Documentation
  • My code follows the repository's style guidelines
  • New and existing tests pass locally
  • I have added appropriate error handling
  • I have added or updated documentation as needed

Additional context

Closes #328

Previously, sampling response parsing would fail if a stopReason
was provided besides endTurn/stopSequence/maxTokens. This fixes
that to map the arbitrary values to UNKNOWN instead.

Spec: https://github.com/modelcontextprotocol/modelcontextprotocol/blob/f5ccad944fdf2b7d9cc70cf817f66ca5a8aa03a4/schema/2024-11-05/schema.ts#L807
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
None yet
Projects
None yet
Development

Successfully merging this pull request may close these issues.

Freeform stopReasons in sampling responses are unsupported
2 participants