Wrangler and the toolchain for Cloudflare Workers.
States that copied values go stale, and points at the config that defines them instead.
This file points the agent at 3 other documents in the repository. Open any of them to read it here, as it was at this commit.
├── .changeset │ └── ├── .github │ └── PULL_REQUEST_TEMPLATE.md — not in the repository at this commit └── AGENTS.md — each package's own AGENTS.md
File measured on main at commit f830836. Analysis written 2026-09-14. Star count is a snapshot from September 2026.
Opens with a rule about its own maintenance, then covers commands, a task-to-location table, cross-tool development, and testing conventions. Subsystem detail is delegated to per-package files.
Quoted lines are verbatim from the file. Open one to see it where it sits.
Pointing at the source of truth
The second sentence of the file rules out copying details into it, naming versions, rule lists and counts as the things that go stale. Later sections apply it: the root package file is named as authoritative for scripts, and a validation command replaces a duplicated list of enforced lint rules.
Fourteen rows map a thing the agent might be asked to do onto the location that handles it, with a note on each. The first column is the task rather than the path, so the table is read by intent.
Three tools consume the same development platform, so a feature is stated to be incomplete if it only works through one of them. Implementation goes in the shared layer wherever possible, with the integration layers kept thin, and intentional gaps documented in the pull request.
Nested instruction files
Packages carry their own instruction files, and the agent is directed to read the closest applicable one before making changes and to update it in the same change when the change makes it inaccurate. The division of content between the root file and package files is stated.
Hard prohibitions
Shell commands may not be built from interpolated or concatenated untrusted input, and the custom lint rule that enforces it is named.
Workers SDK's file tells an agent how the codebase works. It cannot tell it which bug three customers hit this week. Modem keeps that context current and attaches it to the work.