fleet-memory/CLAUDE.md

CLAUDE.md

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

Project Overview

Hindsight is an agent memory system that provides long-term memory for AI agents using biomimetic data structures. Memories are organized as:

• World facts: General knowledge ("The sky is blue")
• Experience facts: Personal experiences ("I visited Paris in 2023")
• Opinion facts: Beliefs with confidence scores ("Paris is beautiful" - 0.9 confidence)
• Observations: Complex mental models derived from reflection

Development Commands

API Server (Python/FastAPI)

# Start API server (loads .env automatically)
./scripts/dev/start-api.sh

# Run all tests (parallelized with pytest-xdist)
cd hindsight-api && uv run pytest tests/

# Run specific test file
cd hindsight-api && uv run pytest tests/test_http_api_integration.py -v

# Run single test function
cd hindsight-api && uv run pytest tests/test_retain.py::test_retain_simple -v

# Lint and format
cd hindsight-api && uv run ruff check .
cd hindsight-api && uv run ruff format .

# Type checking (uses ty - extremely fast type checker from Astral)
cd hindsight-api && uv run ty check hindsight_api/

Control Plane (Next.js)

./scripts/dev/start-control-plane.sh
# Or manually:
cd hindsight-control-plane && npm run dev

Documentation Site (Docusaurus)

./scripts/dev/start-docs.sh

Generating Clients/OpenAPI

# Regenerate OpenAPI spec after API changes (REQUIRED after changing endpoints)
./scripts/generate-openapi.sh

# Regenerate all client SDKs (Python, TypeScript, Rust)
./scripts/generate-clients.sh

Benchmarks

./scripts/benchmarks/run-longmemeval.sh
./scripts/benchmarks/run-locomo.sh
./scripts/benchmarks/start-visualizer.sh  # View results at localhost:8001

Architecture

Monorepo Structure

• hindsight-api/: Core FastAPI server with memory engine (Python, uv)
• hindsight/: Embedded Python bundle (hindsight-all package)
• hindsight-control-plane/: Admin UI (Next.js, npm)
• hindsight-cli/: CLI tool (Rust, cargo, uses progenitor for API client)
• hindsight-clients/: Generated SDK clients (Python, TypeScript, Rust)
• hindsight-docs/: Docusaurus documentation site
• hindsight-integrations/: Framework integrations (LiteLLM, OpenAI)
• hindsight-dev/: Development tools and benchmarks

Core Engine (hindsight-api/hindsight_api/engine/)

• memory_engine.py: Main orchestrator (~170KB) for retain/recall/reflect operations
• llm_wrapper.py: LLM abstraction supporting OpenAI, Anthropic, Gemini, Groq, Ollama, LM Studio
• embeddings.py: Embedding generation (local sentence-transformers or TEI)
• cross_encoder.py: Reranking (local or TEI)
• entity_resolver.py: Entity extraction and normalization
• query_analyzer.py: Query intent analysis

retain/: Memory ingestion pipeline

• orchestrator.py: Coordinates the retain flow
• fact_extraction.py: LLM-based fact extraction from content
• link_utils.py: Entity link creation and management

search/: Multi-strategy retrieval

• retrieval.py: Main retrieval orchestrator
• graph_retrieval.py: Entity/relationship graph traversal
• mpfp_retrieval.py: Multi-Path Fact Propagation retrieval
• fusion.py: Reciprocal rank fusion for combining results
• reranking.py: Cross-encoder reranking

API Layer (hindsight-api/hindsight_api/api/)

• http.py: FastAPI HTTP routers (~80KB) for all REST endpoints
• mcp.py: Model Context Protocol server implementation

Main operations:

• Retain: Store memories, extracts facts/entities/relationships
• Recall: Retrieve memories via 4 parallel strategies (semantic, BM25, graph, temporal) + reranking
• Reflect: Deep analysis forming new opinions/observations (disposition-aware)

Database

PostgreSQL with pgvector. Schema managed via Alembic migrations in hindsight-api/hindsight_api/alembic/. Migrations run automatically on API startup.

Key tables: banks, memory_units, documents, entities, entity_links

Key Conventions

Code Quality

Always run the lint script after making Python or TypeScript/Node changes:

./scripts/hooks/lint.sh

This runs the same checks as the pre-commit hook (Ruff for Python, ESLint/Prettier for TypeScript).

Memory Banks

• Each bank is an isolated memory store (like a "brain" for one user/agent)
• Banks have dispositions (skepticism, literalism, empathy traits 1-5) affecting reflect
• Banks can have background context
• Bank isolation is strict - no cross-bank data leakage

API Design

• All endpoints operate on a single bank per request
• Multi-bank queries are client responsibility to orchestrate
• Disposition traits only affect reflect, not recall

Python Style

• Python 3.11+, type hints required
• Async throughout (asyncpg, async FastAPI)
• Pydantic models for request/response
• Ruff for linting (line-length 120)
• No Python files at project root - maintain clean directory structure

TypeScript Style

• Next.js App Router for control plane
• Tailwind CSS with shadcn/ui components

Adding New API Configuration Flags

When adding a new environment variable configuration:

1. config.py (hindsight-api/hindsight_api/config.py):

   • Add ENV_* constant for the environment variable name
   • Add DEFAULT_* constant for the default value
   • Add field to HindsightConfig dataclass
   • Add initialization in from_env() method

2. main.py (hindsight-api/hindsight_api/main.py):

   • Add field to the manual HindsightConfig() constructor call (search for "CLI override")

3. Use the config in code:

   from ...config import get_config
   config = get_config()
   value = config.your_new_field
   

4. Documentation (hindsight-docs/docs/developer/configuration.md):

   • Add to appropriate section table with Variable, Description, Default

Environment Setup

cp .env.example .env
# Edit .env with LLM API key

# Python deps
uv sync --directory hindsight-api/

# Node deps (uses npm workspaces)
npm install

Required env vars:

• HINDSIGHT_API_LLM_PROVIDER: openai, anthropic, gemini, groq, ollama, lmstudio
• HINDSIGHT_API_LLM_API_KEY: Your API key
• HINDSIGHT_API_LLM_MODEL: Model name (e.g., o3-mini, claude-sonnet-4-20250514)

Optional (uses local models by default):

• HINDSIGHT_API_EMBEDDINGS_PROVIDER: local (default) or tei
• HINDSIGHT_API_RERANKER_PROVIDER: local (default) or tei
• HINDSIGHT_API_DATABASE_URL: External PostgreSQL (uses embedded pg0 by default)