Neuronpedia is an open-source platform for examining how neural networks work through model activations, circuits, feature representations, and related analyses. Researchers and developers use it to inspect, search, score, visualize, and export interpretability data. Its catalogue add-ons support local development and workflows around the platform.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/hijohnnylin/neuronpedia/copilot-instructionsgit clone --depth 1 https://github.com/hijohnnylin/neuronpediaWrote 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/hijohnnylin/neuronpedia/copilot-instructions)<a href="https://agentmods.dev/instructions/hijohnnylin/neuronpedia/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/hijohnnylin/neuronpedia/copilot-instructions.svg" alt="Measured on agentmods" 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 | $0.00121 | $0.00121 |
| Opus 5 | $0.00060 | $0.00060 |
| Sonnet 5 | $0.00024 | $0.00024 |
| Haiku 4.5 | $0.00012 | $0.00012 |
Grade A, and why
neuronpedia copilot-instructions.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 5d ago.
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.
What it actually says
Copilot instructions
This repository keeps all agent instructions in AGENTS.md at the root, so that no
rule is visible to one coding agent and invisible to another. Read it before making changes.
Subdirectories with their own conventions carry a nested AGENTS.md — currently
apps/webapp/AGENTS.md. Read the one nearest the code you are editing,
in addition to the root file.
Do not add project rules to this file; add them to the nearest AGENTS.md instead.
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.
- 5d ago First seen · 11 lines · 121 tokens per session scan A 1fbce2eba274
neuronpedia copilot-instructions.md is an instructions file published in the GitHub repository hijohnnylin/neuronpedia (1,122 stars, last pushed yesterday), licensed Apache-2.0. It adds 121 tokens to every session, about $0.0006 per session on Opus 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
nnsight CLAUDE.md
Instructions for ndif-team/nnsight, covering nnsight — agent guide, how to use this file, by task, "i want multi-token / autoregressive generation" and "i want to run multiple prompts at once".
ndif CLAUDE.md
Claude Code instructions for ndif-team/ndif, covering claude.md — ndif agent guide, what ndif is, top-level layout, architecture at a glance and security sandbox (the highest-stakes area).
agent-lens CLAUDE.md
Instructions for dreadnode/agent-lens, covering agentlens, project structure, running experiments, config format (yaml) and engines.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.