modelcontextprotocol/experimental-ext-variants
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experimental-ext-variants/go/sdk/examples/server/github
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Kurt Degiorgio e1c17e047f
 Add example servers for SEP-2053 variant patterns (#4) 
Add four new example servers demonstrating different SEP-2053 variant
patterns:

- model-optimized (same tools, different descriptions per LLM family)
- trading (API versioning with deprecation lifecycle)
- research (context budget management)
- Refactor the existing variants-http example into a GitHub-style server
with custom ranking.

Signed-off-by: Kurt Degiorgio <kdegiorgio@bloomberg.net>
2026-03-01 12:42:43 +05:30
..
main.go Add example servers for SEP-2053 variant patterns (#4) 2026-03-01 12:42:43 +05:30
README.md Add example servers for SEP-2053 variant patterns (#4) 2026-03-01 12:42:43 +05:30
tools.go Add example servers for SEP-2053 variant patterns (#4) 2026-03-01 12:42:43 +05:30

README.md

GitHub Developer Platform

A variant-aware MCP server that exposes different tool sets for different agent types, mirroring the GitHub MCP Server pattern described in SEP-2053's Prior Art section.

Pattern demonstrated: Different tool sets per variant with custom ranking.

Variants

Variant Tools Description
code-review list_pull_requests, get_diff, add_review_comment PR operations and code review
project-management list_issues, create_issue, add_label Issue tracking and labels
security-readonly list_security_alerts, get_advisory Security scanning (read-only)
ci-automation list_workflow_runs, trigger_workflow CI/CD workflow management

Custom Ranking

Clients send a "domain" hint during initialization. The ranking function boosts variants whose domain hint matches the client's requested domain, falling back to priority order.

Run

go run ./examples/server/github

Connect any MCP client to http://localhost:8080.

Demo

See mcp-inspector-variants-demo.mp4 for a walkthrough using MCP Inspector.