vectorize-io/hindsight is an agent memory system that stores experiences and helps AI agents learn over time instead of only recalling conversation history. It is used by developers adding long-term memory to agents, including coding agents. Catalogue add-ons connect agents to Hindsight and its memory workflows.
Borrowing it
Nothing to install: this file belongs to vectorize-io/hindsight. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vectorize-io/hindsight/main/CLAUDE.mdgit clone --depth 1 https://github.com/vectorize-io/hindsightWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/vectorize-io/hindsight/claude-md)<a href="https://agentmods.dev/instructions/vectorize-io/hindsight/claude-md"><img src="https://agentmods.dev/badge/instructions/vectorize-io/hindsight/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/vectorize-io/hindsight/claude-md"><img src="https://agentmods.dev/badge/instructions/vectorize-io/hindsight/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.06271 | $0.06271 |
| Opus 5.5 | $0.02508 | $0.02508 |
| Sonnet 5.5 | $0.01254 | $0.01254 |
| Haiku 4.5 | $0.00627 | $0.00627 |
Grade A, and why
hindsight CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured today.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 522 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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")
- Mental models: Consolidated knowledge synthesized from facts ("User prefers functional programming patterns")
Development Commands
Local Development (API + UI)
# Start both API server and control plane UI
./scripts/dev/start.sh
API Server (Python/FastAPI)
# Start API server only (loads .env automatically)
./scripts/dev/start-api.sh
# Run all tests (parallelized with pytest-xdist)
cd hindsight-api-slim && uv run pytest tests/
# Run specific test file
cd hindsight-api-slim && uv run pytest tests/test_http_api_integration.py -v
# Run single test function
cd hindsight-api-slim && uv run pytest tests/test_retain.py::test_retain_with_chunks -v
# Lint and format
cd hindsight-api-slim && uv run ruff check .
cd hindsight-api-slim && uv run ruff format .
# Type checking (uses ty - extremely fast type checker from Astral)
cd hindsight-api-slim && 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
# Run frontend unit tests
cd hindsight-control-plane && npm test
# Run frontend linter
cd hindsight-control-plane && npm run lint
CLI Tool (Rust)
# Build CLI binary (hindsight-cli/target/release/hindsight)
cd hindsight-cli && cargo build --release
# Run CLI tests
cd hindsight-cli && cargo test
System Tests (Blackbox End-to-End)
# Prerequisite: server needs pg0 installed in api-slim
(cd hindsight-api-slim && uv sync --frozen --extra embedded-db)
# Run blackbox integration tests against local embedded Postgres & stub provider
# (The stub handles LLM, embeddings, and reranking without downloading models)
cd hindsight-system-tests && uv run pytest tests/ -v
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- today Changed · +1 lines · +36 tokens per session 0d7ec760b62e
- 9d ago Changed · +3 tokens per session 604f98f626a6
- 19d ago Changed · -1 lines · -30 tokens per session 0f8378bd07c8
- 23d ago Changed · +8 tokens per session dde6cf123176
- 28d ago Changed · +2 lines · +48 tokens per session eb15bf1c6bbd
- 29d ago Changed · +1 lines · +8 tokens per session dedf49dfcc32
- 1mo ago Changed · +18 lines · +197 tokens per session d0cd736a6617
- 1mo ago Changed · +3 tokens per session 3024dc2fb5cf
- 1mo ago Changed · +1 lines · +62 tokens per session 03d028439f68
- 1mo ago First seen · 500 lines · 5,936 tokens per session scan A 349f26a62956
hindsight CLAUDE.md is an instructions file published in the GitHub repository vectorize-io/hindsight (55,527 stars, last pushed today), licensed MIT. It adds 6,271 tokens to every session, about $0.0251 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.