# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Build, Lint & Test Commands

```bash
# Build (debug)
cargo build

# Build (release with optimizations)
cargo build --release

# Build (release-min profile: size-optimized LTO)
cargo build --profile release-min

# Run (debug, starts server on http://localhost:8000)
cargo run

# Run with Obscura in-process browser (no external binaries needed)
cargo run --features obscura-inprocess

# Run CLI binary
cargo run --bin astroresearch_cli

# Run health check tool
cargo run --bin health_check          # read-only scan
cargo run --bin health_check -- --fix # auto-repair

# Lint
cargo clippy

# Format
cargo fmt

# All tests
cargo test

# Unit tests only
cargo test --lib

# Run a specific test
cargo test test_name

# Frontend (cd dashboard first)
npm run dev       # HMR dev server on :5173, proxies /api to :8000
npm run build     # TypeScript check + Vite production build → dashboard/dist/
npm run lint      # ESLint
```

## Architecture Overview

**Stack**: Rust Axum backend (port 8000) + React/Vite/TypeScript frontend (port 5173 in dev). In production, the Rust binary serves the pre-built `dashboard/dist/` via `ServeDir` and `ServeFile` fallback, so there is a single process.

### Source Layer Map

```
src/
├── main.rs          # Axum server entry: logging, DB pool, migrations, vec0 table,
│                    # client/service construction, route registration, AppState assembly
├── lib.rs           # Config struct + from_env() loading from .env
├── api/             # HTTP handlers, AppState, StandardPaper type
│   ├── mod.rs       # AppState (shared state), StandardPaper, handlers re-exports
│   ├── agent.rs     # SSE chat_agent endpoint, session CRUD, metrics, audit log
│   ├── papers.rs    # Search, download, parse, translate, embed, citations, library, export
│   ├── notes.rs     # Highlight/note CRUD
│   ├── sync.rs      # Meta-sync and asset-batch endpoints
│   ├── targets.rs   # Target query/associate/extract, RAG chat, figure chat
│   └── helpers.rs   # Shared DB helpers, format conversion, path validation
├── agent/           # ReAct-based research agent (LLM-driven tool-use loop)
│   ├── tools/       # AgentTool trait, ToolRegistry, tool implementations per domain file
│   ├── runtime/     # ReAct loop engine, streaming, session management, context building
│   ├── compact/     # Context compression (micro/auto/manual layers)
│   ├── hooks.rs     # Lifecycle events (PreToolUse/PostToolUse/Stop/etc.)
│   ├── skills.rs    # SkillRegistry: loads skill SKILL.md files from skills/ directory
│   ├── subagent.rs  # Context-isolated sub-agent runner for delegate_research
│   ├── background.rs# BgNotificationQueue for async slow-task (download/parse) notifications
│   └── team/        # Multi-agent team: file-based inbox, lead/teammate coordination
├── clients/         # External API wrappers
│   ├── llm.rs       # LlmClient (OpenAI-compatible chat + streaming), EmbeddingClient
│   ├── ads.rs       # NASA ADS API
│   ├── arxiv.rs     # arXiv Atom XML API
│   └── qiniu.rs     # Qiniu cloud storage
├── services/        # Business logic
│   ├── search.rs    # Unified cross-source search (ADS + arXiv dedup)
│   ├── download.rs  # PDF/HTML download with anti-bot measures and fallback chain
│   ├── parser/      # HTML/PDF → Markdown parsers (A&A, IOP, ar5iv, generic, PDF via MinerU)
│   ├── translation.rs# LLM bilingual translation with Trie-based astronomy glossary
│   ├── rag.rs       # Embedding ingest + vector similarity retrieval + LLM answer generation
│   ├── target.rs    # Celestial target extraction (IAU name regex) + CDS Sesame lookup
│   ├── chunker.rs   # Markdown text chunking for embedding
│   ├── batch/       # Meta-sync (ADS bulk harvest) and asset-batch processing engines
│   ├── query_parser.rs# Advanced search query syntax parser
│   └── logging.rs   # Pretty console + rolling file logger
└── bin/
    ├── health_check.rs # Library consistency checker and auto-repair
    ├── cli.rs          # CLI interface
    └── reparse.rs      # Re-parse existing library items
```

### AppState — Central Shared State

All handlers access state via `Arc<AppState>`. Key fields:

- `db: SqlitePool` — SQLite connection pool (5 max connections, foreign keys enforced)
- `llm: LlmClient` / `embedding: EmbeddingClient` — OpenAI-compatible LLM clients
- `ads: AdsClient` / `arxiv: ArxivClient` — academic search clients
- `skill_registry: Arc<RwLock<SkillRegistry>>` — hot-reloaded agent skills
- `cancelled_runs: Arc<Mutex<HashSet<String>>>` — agent cancellation tokens
- `harvest_status` / `batch_status` — async batch operation status tracking

### Agent System Design

The agent (`src/agent/`) implements a **ReAct** (Thought → Action → Observation) loop:

1. **`AgentRuntime`** (`runtime/mod.rs`) orchestrates the loop: session create/resume → context build → ReAct loop → finalize
2. **Streaming**: LLM response is streamed via SSE (`AgentStreamEvent`) — thought, tool_call, tool_result, text_delta, usage, error, done
3. **Tools**: Each tool implements `AgentTool` trait (name, description, JSON Schema parameters, execute). 19 tools in default registry including read_file, grep_files, glob_files, run_bash, file_write, file_edit, search_papers, download_paper, parse_paper, get_paper_content, rag_search, query_target, save_note, todo_write, compress_context, load_skill, delegate_research, plus optional background and team tools
4. **Parallel execution**: Same-turn tool calls execute concurrently via `executor::execute_parallel`
5. **Context compression**: Three layers — micro (placeholder replacement), auto (LLM summarization when over threshold), manual (compress_context tool). Protected by `CompactionCircuitBreaker`
6. **Skills** (`skills.rs`): Two-layer loading — system-reminder lists names (~20 tokens each), LLM calls `load_skill` to inject full SKILL.md content
7. **Sub-agents** (`subagent.rs`): `delegate_research` spawns a context-isolated sub-agent with its own ReAct loop, returning only the final summary
8. **Teams** (`team/`): File-based inbox directory per session for lead/teammate message passing
9. **Background tasks** (`background.rs`): Slow ops (download, parse) can run async; results inject via `BgNotificationQueue` before next LLM call

Environment variables for agent tuning: `AGENT_MAX_STEPS` (default 8), `AGENT_TOOL_TIMEOUT_SECS` (default 120), `AGENT_MAX_TOOL_OUTPUT_CHARS` (default 4000), `AGENT_CONTEXT_CHAR_LIMIT` (default 16000), `AGENT_TOKEN_SOFT_LIMIT` / `AGENT_TOKEN_HARD_LIMIT`.

### Database

SQLite via `sqlx::sqlite`. Migrations in `migrations/` are auto-run on startup (`sqlx::migrate!("./migrations")`). Key tables: `papers`, `citations_references`, `notes`, `agent_sessions`, `agent_messages`, `agent_tasks`, `agent_audit_log`, `paper_chunks_content`. Vector embeddings use `sqlite-vec` (`vec_paper_chunks` virtual table, auto-registered before any DB connection).

The embedding dimension is controlled by `EMBEDDING_DIM` env var (default 1536). On dimension mismatch, the vec table and chunk content are dropped and recreated.

### Frontend (dashboard/)

React 19 + TypeScript + Vite + Tailwind CSS 4. Features are organized by domain:

- `features/search/` — Cross-source paper search panel
- `features/library/` — Local library management
- `features/reader/` — Bilingual reader with highlight annotations (KaTeX for math)
- `features/citation/` — Canvas-based force-directed citation graph
- `features/sync/` — Batch sync control panel
- `features/agent/` — Agent chat interface (SSE event consumption)
- `features/settings/` — System configuration

Dependencies: `react-markdown` + `rehype-katex` + `remark-math` for Markdown/LaTeX rendering, `framer-motion` for animations, `lucide-react` for icons.

### Obscura In-Process Browser

The `obscura-inprocess` feature compiles `obscura-browser` and `obscura-net` directly into the binary, eliminating the need for external browser binaries. This is used for bypassing Cloudflare/WAF on PDF download. Enabled via `--features obscura-inprocess`.

### Astronomy Glossary (dictionary.txt)

A 1MB+ bilingual astronomy terminology file loaded at startup into a Trie tree for longest-match glossary construction, used by the translation service to guide LLM translations with domain-accurate term mappings.

## Code Conventions

- Use `anyhow` for application errors, `thiserror` for library-style typed errors
- Environment variables via `dotenvy` + `std::env::var`, with defaults in `Config::from_env()`
- SQL queries use parameterized bindings (`sqlx::query("...").bind(...)`) — never string interpolation
- API handlers take `State(Arc<AppState>)` and return Axum-compatible responses
- Agent tools implement `AgentTool` trait; new tools register in `ToolRegistry::new()`
- Front-end build is triggered by `build.rs` (auto npm install + build when `dashboard/src/` changes)