Add deterministic snippet IDs to MCP server outputs

[lolipopshock]

Summary

• Adds a snippet_id field to every document/result returned by MCP search and browse tools
• IDs are deterministic (UUID5 from URL), so the same URL always produces the same 8-char ID
• Duplicate URLs within a single tool call get -1, -2 suffixes to stay unique
• This means tool call outputs match what the model sees at inference time, without needing post-processing in the tool interface layer

Tools updated

Tool	snippet_id source
semantic_scholar_search	data[].url
semantic_scholar_snippet_search	data[].paper.url
pubmed_search	data[].url
massive_serve_search	data[].doc_id
serper_google_webpage_search	organic[].link
serper_google_scholar_search	organic[].link
serper_fetch_webpage_content	input URL
jina_fetch_webpage_content	input URL
crawl4ai_fetch_webpage_content	input URL
crawl4ai_docker_fetch_webpage_content	input URL
webthinker_fetch_webpage_content	input URL
webthinker_fetch_webpage_content_async	input URL

Test plan

• Verify snippet IDs appear in search tool JSON responses
• Verify same URL produces same snippet_id across calls
• Verify duplicate URLs in snippet search get unique suffixed IDs

🤖 Generated with Claude Code