# Session Log: 2026-03-13 21:00

## Project: .mcp-server-bibliography

> Also logged: Task Management (skills updates) — `../../log/2026-03-13-2100.md`

## What We Did
- Added Semantic Scholar as 4th source adapter (created in prior session, tested and confirmed working)
- Rewrote S2 adapter to use `/paper/search/bulk` (recommended by S2) and Recommendations API for `find_similar_works`
- Added 4 new S2 Graph API methods: `get_paper_citations`, `get_paper_references`, `search_author` + `get_author_papers`, `get_paper_detail`
- Extended Paper model with `tldr`, `bibtex`, `open_access_url` fields
- Exposed 4 new MCP tools: `scholarly_citations`, `scholarly_references`, `scholarly_paper_detail`, `scholarly_author_papers`
- Server now has 17 tools total (7 OpenAlex + 10 scholarly) across 4 sources
- Fixed S2 field scoping: base fields for bulk endpoints, extended fields (tldr, citationStyles, isOpenAccess, openAccessPdf) only for single paper lookups
- Fixed citations/references endpoints to use `citingPaper.` / `citedPaper.` field prefixes
- All 6 test categories passed: bulk search, DOI verify, forward citations, backward references, author search + papers, paper detail with TLDR/BibTeX, recommendations

## Key Decisions
- S2 Datasets API (bulk download) is NOT suitable for live MCP queries — only Graph + Recommendations are used
- Extended fields (`tldr`, `citationStyles`) only available on single paper lookup, not bulk/citations/references endpoints — used separate field constants `S2_FIELDS` vs `S2_DETAIL_FIELDS`
- the user applying for S2 API key for higher rate limits (drafted application answers)

## Problems/Blockers
- First attempt at extended fields caused 400 errors on bulk search, citations, and references endpoints — resolved by splitting field constants
- Citations/references endpoints need prefixed nested fields (`citingPaper.title`, `citedPaper.title`) — different from other endpoints

## Next Steps
- [ ] Add S2_API_KEY to `research/scout/.env` once the user receives it
- [ ] Consider adding S2 as a source in Scout CLI itself (currently only OpenAlex/Scopus/WoS)

## Files Changed
- `sources/models.py` — added `tldr`, `bibtex`, `open_access_url` fields to Paper dataclass
- `sources/semantic_scholar_source.py` — added `S2_DETAIL_FIELDS`, 5 new methods, enriched `_to_paper` with tldr/bibtex/oa_url
- `server.py` — added 4 new tool definitions and handlers
- `run.sh` — S2_API_KEY added to env var loading (prior session)
