[WIP] Partial migration of pullrequests toolset to modelcontextprotocol/go-sdk

[Copilot]

Migrates the pullrequests toolset from mark3labs/mcp-go to modelcontextprotocol/go-sdk. This is part of the broader SDK migration tracked in #1428.

Status

Migrated (2/10 tools):

• PullRequestRead - 6 methods (get, get_diff, get_status, get_files, get_review_comments, get_reviews)
• CreatePullRequest

Pending (8/10 tools): Commented out with TODO: MIGRATE THIS TOOL

• UpdatePullRequest, ListPullRequests, MergePullRequest, SearchPullRequests, UpdatePullRequestBranch, PullRequestReviewWrite, AddCommentToPendingReview, RequestCopilotReview

Changes

Tool definition pattern:

// Old DSL-based
func Foo(...) (mcp.Tool, server.ToolHandlerFunc) {
    return mcp.NewTool("name",
        mcp.WithString("param", mcp.Required(), ...),
        ...
    ), handler
}

// New JSON Schema-based
func Foo(...) (mcp.Tool, mcp.ToolHandlerFor[map[string]any, any]) {
    tool := mcp.Tool{
        Name: "name",
        InputSchema: &jsonschema.Schema{
            Type: "object",
            Properties: map[string]*jsonschema.Schema{
                "param": {Type: "string", ...},
            },
            Required: []string{"param"},
        },
    }
    handler := mcp.ToolHandlerFor[map[string]any, any](
        func(ctx context.Context, _ *mcp.CallToolRequest, args map[string]any) (*mcp.CallToolResult, any, error) {
            // params extracted from args map
        },
    )
    return tool, handler
}

Key signature changes:

• Handler: (ctx, request) (*Result, error) → (ctx, _, args map[string]any) (*Result, any, error)
• Parameter extraction: RequiredParam[T](request, "key") → RequiredParam[T](args, "key")
• Result construction: mcp.NewToolResultText() → utils.NewToolResultText()

Notes:

• get_comments method temporarily disabled (depends on unmigrated issues.go)
• Helper functions return (*Result, error), handlers return (*Result, any, error)
• search_utils.go updated to accept args map[string]any

Original prompt

Migrate the pullrequests toolset to modelcontextprotocol/go-sdk.

This will be merged into the parent PR #1428, so reference that PR in the description to track the migration

Custom agent used: go-sdk-tool-migrator
Agent specializing in migrating MCP tools from mark3labs/mcp-go to modelcontextprotocol/go-sdk

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✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[LuluBeatson]

Replaced by #1466