chore(mcp): Change default sourcebot host to localhost

[brendan-kellam]

Summary by CodeRabbit

• Documentation

  • Added visibility parameter documentation to the ask_codebase tool, detailing chat session privacy options (PRIVATE or PUBLIC), default configurations for authenticated versus anonymous users, and information about sharing sessions via link.

• Changed

  • Updated default SOURCEBOT_HOST configuration value to http://localhost:3000, replacing the previous demo environment default.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

Adds documentation for a new visibility parameter on the ask_codebase tool and changes the MCP package default SOURCEBOT host from https://demo.sourcebot.dev to http://localhost:3000 (constant renamed internally).

Changes

Cohort / File(s)	Summary
Visibility parameter documentation docs/docs/features/mcp-server.mdx, packages/mcp/README.md	Adds visibility parameter docs for ask_codebase (describes PRIVATE/PUBLIC options, defaults for authenticated vs anonymous users, and link-sharing note).
MCP package config & changelog packages/mcp/src/env.ts, packages/mcp/CHANGELOG.md	Renames internal SOURCEBOT_DEMO_HOST → SOURCEBOT_DEFAULT_HOST and changes SOURCEBOT_HOST default to http://localhost:3000; adds changelog entry documenting the change/deprecation.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• feat(mcp): Add optional visibility parameter to control chat visibility #903: Implements the visibility parameter schema and API/route handling for ask_codebase.

Suggested reviewers

• msukkari

✨ Finishing Touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bkellam/mcp-nits

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