copperhead.sh valid

Copperhead

Copperhead is an open source (Apache-2.0) AI agent for hardware design, "Cursor for circuit boards." Given a plain-English change request or a product brief, it edits real KiCad files (.kicad_sch, .kicad_pcb) in your own git repository, propagates the change into every document that references it (pinout, BOM, subsystem docs, firmware scaffold) and verifies its own work by running `kicad-cli` ERC and DRC until the checks pass. Every run leaves its artifacts on disk.

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-25T21:10:44.710Z. Cached copy · Source on copperhead.sh

# Copperhead

> Copperhead is an open source (Apache-2.0) AI agent for hardware design, "Cursor for circuit boards." Given a plain-English change request or a product brief, it edits real KiCad files (.kicad_sch, .kicad_pcb) in your own git repository, propagates the change into every document that references it (pinout, BOM, subsystem docs, firmware scaffold) and verifies its own work by running `kicad-cli` ERC and DRC until the checks pass. Every run leaves its artifacts on disk.

Built by Animesh Chouhan. Proven on Open Telegraph, a shipping 40×40 mm ESP32-S3 Morse key with a 25 µA deep-sleep budget: building that board produced Copperhead, and redesigning the board through Copperhead proved it.

Two invariants make the loop trustworthy:

1. Nothing starts without a spec. The edit tools are structurally locked until a validated change proposal exists, so every edit is traceable to a documented intent.
2. Nothing is "done" until the tools agree. Every file mutation is followed by an ERC/DRC run before the agent reports success, inside a git snapshot that rolls back if verification fails.

Spec-gated in, verification-gated out: the design cannot drift from its requirements, because drift is a build failure.

Key facts:

- Two ways to use it: iterate on an existing KiCad repository (`copperhead init`, then `copperhead do "..."`, the main case), or run the full pipeline from a written brief (`copperhead create --brief brief.md`) to get a spec, architecture, justified part selection, ERC-clean schematic, DRC-clean draft layout, gerbers, renders, an orderable BOM and a bring-up plan.
- Install: `npm i -g copperhead`. Requires Node 20+, KiCad with `kicad-cli` on the path and your own model API key (model-agnostic: Claude and GPT-5 both tested; set ANTHROPIC_API_KEY or OPENAI_API_KEY).
- Cost: roughly $0.10 to $1.00 in model tokens per change request, 5 to 10 times that for a full `create` run; billed by your model provider. The CLI itself is free forever and does every core operation without a paid plan. Copperhead Cloud adds hosted runs on private repos at $49 per user per month, Team adds org governance and a CI bot for a flat $199 per month and Enterprise is a custom flat annual license, self-hosted. Cloud is free for public repositories released under CERN-OHL-S or an OSHWA-certified license, within fair-use credit limits.
- Everything it writes is plain markdown, JSON and KiCad source, with no proprietary format and no editor to move into. Edits are surgical s-expression changes, so diffs stay small and untouched file regions stay byte-identical.
- It does not replace a hardware engineer: draft layouts are correct rather than optimal, and LAYOUT.md states what a specialist should redo before fabrication. It refuses to run on a dirty git tree, refuses edits without a validated proposal, refuses changes that break documented constraints and never invents unjustifiable part numbers.
- Data stays local on the CLI: the agent runs on your machine, sto
…

Related sites

Explore similar publishers →

Category suggestions: other listed sites in AI and machine learning. These share a category. See the whole category →

Machine-readable: GET /v1/resolve?q=copperhead.sh · GET /v1/domain/copperhead.sh · this page as Accept: application/json or text/markdown · MCP lookup_domain

Automatically discovered from public files. Inclusion does not imply endorsement or publisher participation.

Claim my listing on Agent Web Map for copperhead.sh:
1. POST https://agentwebmap.com/v1/sites/copperhead.sh/claims and keep claim_id and claim_secret private.
2. Publish the verification line "AgentWebMap verification: <token>" (token from step 1) in https://copperhead.sh/llms.txt, or use the DNS, meta-tag or well-known method the response describes. This only verifies the listing; your website and domain remain yours.
3. POST https://agentwebmap.com/v1/sites/copperhead.sh/verify with {"claim_id": "...", "claim_secret": "..."}.
4. Save the api_key from the answer; it manages the listing (PATCH https://agentwebmap.com/v1/sites/copperhead.sh).
MCP equivalent: tools begin_ownership_claim, then verify_domain, at https://agentwebmap.com/mcp. Docs: https://agentwebmap.com/docs#verify

Corrections or removal requests: contact the directory.