[plan] Add package documentation to 9 core MCP files

[github-actions]

Objective

Add comprehensive package-level documentation comments to 9 critical MCP files currently missing them. Improve comment ratio from 4.0% toward the 30% target in AGENTS.md validation guidelines.

Context

From the MCP Server Integration Quality analysis:

• 9 core MCP files lack package documentation
• Current comment ratio is 4.0% (439/10,979 LOC) - far below 30% target
• Steep learning curve for contributors due to missing architectural documentation

Files Requiring Package Documentation

• pkg/workflow/mcp_gateway_config.go - MCP gateway configuration types and validation
• pkg/workflow/mcp_environment.go - Environment variable generation for MCP server execution
• pkg/workflow/mcp_setup_generator.go - GitHub Actions setup steps for MCP server initialization
• pkg/workflow/mcp_gateway_constants.go - Version constants and default values for MCP gateway
• pkg/workflow/mcp_github_config.go - GitHub MCP server configuration and toolset management
• pkg/workflow/mcp-config-utils.go - Utility functions for MCP configuration processing
• pkg/workflow/mcp-config-playwright.go - Playwright MCP server configuration and Docker setup
• pkg/workflow/mcp_renderer.go - YAML rendering for MCP server definitions in GitHub Actions
• pkg/workflow/mcp-config-builtin.go - Built-in MCP server definitions and defaults

Documentation Pattern

Follow Go documentation conventions:

// Package workflow provides MCP gateway configuration for workflow compilation.
//
// The MCP gateway acts as a proxy between AI engines and MCP servers, providing:
// - Protocol translation and connection management
// - Secret injection and credential handling
// - HTTP header support for authentication
// - Network isolation and domain restrictions
//
// Configuration is defined in workflow frontmatter and compiled into
// GitHub Actions workflow YAML. The gateway runs as a containerized service
// during workflow execution.
//
// Related files:
//   - mcp_gateway_constants.go: Gateway version and container constants
//   - mcp_gateway_schema_validation.go: Configuration validation
//   - mcp_setup_generator.go: Setup step generation
//
// Example usage:
//   config := &GatewayConfig{
//       Version: constants.DefaultMCPGatewayVersion,
//       Container: constants.DefaultMCPGatewayContainer,
//   }
package workflow

Key Points to Document

For each file:

• Purpose and responsibility
• How it fits in the MCP compilation pipeline
• Key types and their relationships
• Integration points with other components
• Examples of common usage patterns
• Links to related files/packages

Acceptance Criteria

• All 9 files have comprehensive package-level documentation
• Comments explain purpose, responsibilities, and key concepts
• Follow Go documentation style (complete sentences, starts with package name)
• Include examples where appropriate
• Link related files and packages
• Comment ratio improves measurably (target: move toward 30%)
• make agent-finish passes without errors

Related

• Discussion: 🎯 Repository Quality: MCP Server Integration Quality #11508 (MCP Server Integration Quality)
• Priority: Medium
• Effort: Small

AI generated by Plan Command for discussion #11508