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NeuronScope
Traces LLM outputs to the neurons and heads that caused them
NeuronScope is a CLI and MCP server for mechanistic interpretability. It is built on TransformerLens. Point it at an open-weight model to instantly see which attention heads and neurons drive predictions. Supporting hundreds of checkpoints, it avoids strict allowlists. Its native MCP server and versioned JSON let AI agents (Claude, Cursor) directly trace, ablate, and sketch circuits without any Python coding requirement.
When debugging LLMs, seeing the output isn't enough. Understanding the why is the real bottleneck. "It's probably the prompt" is not a scalable debugging strategy for specific hallucinations.
We built NeuronScope. It wraps TransformerLens into a stable CLI and MCP server, allowing scripts or agents to ask, "Which attention heads and neurons drove this token?" and instantly receive versioned JSON instead of digging through raw tensors.
Core Commands: - Trace: Rank heads/neurons by their contribution to a predicted token. - Activations: Get full per-layer activation stats. - Patch: Zero-ablate components and observe the delta. - Circuit: Build a best-effort circuit sketch.
It supports all 249 TransformerLens checkpoints (Llama, Qwen, Pythia, etc.). The tool is fully MIT-licensed and operates entirely locally, requiring no accounts or API keys.
Thoughts and feedback from the community are very welcome, especially where the circuit heuristic hits its limits.
About NeuronScope on Product Hunt
“Traces LLM outputs to the neurons and heads that caused them”
NeuronScope was submitted on Product Hunt and earned 2 upvotes and 1 comments, placing #158 on the daily leaderboard. NeuronScope is a CLI and MCP server for mechanistic interpretability. It is built on TransformerLens. Point it at an open-weight model to instantly see which attention heads and neurons drive predictions. Supporting hundreds of checkpoints, it avoids strict allowlists. Its native MCP server and versioned JSON let AI agents (Claude, Cursor) directly trace, ablate, and sketch circuits without any Python coding requirement.
On the analytics side, NeuronScope competes within Open Source, Developer Tools, Artificial Intelligence and GitHub — topics that collectively have 1.1M followers on Product Hunt. The dashboard above tracks how NeuronScope performed against the three products that launched closest to it on the same day.
Who hunted NeuronScope?
NeuronScope was hunted by Sourav Nandy. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of NeuronScope including community comment highlights and product details, visit the product overview.
Sourav Nandy
When debugging LLMs, seeing the output isn't enough. Understanding the why is the real bottleneck. "It's probably the prompt" is not a scalable debugging strategy for specific hallucinations.
We built NeuronScope. It wraps TransformerLens into a stable CLI and MCP server, allowing scripts or agents to ask, "Which attention heads and neurons drove this token?" and instantly receive versioned JSON instead of digging through raw tensors.
Core Commands:
- Trace: Rank heads/neurons by their contribution to a predicted token.
- Activations: Get full per-layer activation stats.
- Patch: Zero-ablate components and observe the delta.
- Circuit: Build a best-effort circuit sketch.
It supports all 249 TransformerLens checkpoints (Llama, Qwen, Pythia, etc.). The tool is fully MIT-licensed and operates entirely locally, requiring no accounts or API keys.
Repo: https://github.com/RudrenduPaul/NeuronScope
MCP Servers:
https://mcpservers.org/servers/rudrendupaul/neuronscope
https://glama.ai/mcp/servers/RudrenduPaul/NeuronScope
PyPI: https://pypi.org/project/neuronscope-cli
Get started:
pip install "neuronscope-cli[mcp]"
Thoughts and feedback from the community are very welcome, especially where the circuit heuristic hits its limits.