boxmaker/AGENTS.md

AGENTS.md

Boxmaker is a personal agent harness in Rust: a Cargo workspace of small daemons that talk over Unix sockets. You are implementing it one task at a time.

How you work

1. The owner gives you one task file, docs/plans/M<n>/NN-name.md. Read it fully. Do that task and nothing else. Do not start the next task.
2. Do the steps in order. Where a step shows a command and its expected output, run it and compare.
3. Do not read docs/design.md or other plans unless the task tells you to. The task file quotes what you need.
4. If something in the task is impossible, contradictory, or fails twice in the same way, stop. Do not improvise, do not change a test, do not weaken a check. Add your row to docs/implementer-log.md with status stopped, say what you tried and what happened, commit only that file, and tell the owner.

Files you must never edit

• docs/design.md, docs/decisions.md, docs/inference-contract.md, docs/specs/, docs/plans/
• Anything a task told you to copy from docs/plans/**/files/: tests, fixtures, Makefile, deny.toml, scripts/test-gate-scripts.sh. If a copied test fails, your code is wrong.
• AGENTS.md, CLAUDE.md

Code rules

• Rust stable, edition 2024, rust-version = "1.95". No unsafe. No async runtime.
• No dependency that the task file does not name. All external dependencies are declared in the root Cargo.toml under [workspace.dependencies], used with name.workspace = true, and have a row in docs/dependencies.md.
• proto depends on no workspace crate. Every other crate depends on proto only, never on another role crate.
• No source file over 500 lines.
• Library code never panics on input: no unwrap, expect, panic!, indexing that can go out of bounds, or as casts that can lose data on untrusted values. Tests may use them.
• Errors are plain enums that implement std::fmt::Display and std::error::Error. No anyhow, no thiserror.
• Do not silence a lint with #[allow(...)] unless the task says so. Fix the code.
• Keep struct fields and enum variants in the order the task gives. The order is the wire format.
• Comments say why, not what. Match the amount of commenting you see in the task's examples.

The gate

make gate must print gate: ok before a task is done. It runs offline: rustfmt, clippy with warnings denied, all tests, cargo-deny, and the scripts in scripts/. After you add a dependency, run cargo build once so that Cargo.lock is updated, then run the gate.

Useful while working: cargo test -p <crate> --test <file> runs one test file, and cargo test -p <crate> <name> runs tests whose name contains <name>.

Git

• Work on the branch the task names. One task is one commit.
• Stage only the paths the task lists: git add <path> .... Never git add -A or git add ..
• Never push, amend, rebase, reset, or switch to another branch.
• Commit message: the subject line the task gives, a blank line, then this trailer: Implemented-By: Laguna S 2.1 (OpenCode)

The implementer log

Before you commit, add one row to the table in docs/implementer-log.md and include the file in the commit. Be honest: the log is how the owner judges the process, and a wrong row is worse than a bad one.

Column	What to write
Task	The task file name, for example M1/03-proto-wire
Date	Today's date, YYYY-MM-DD
Status	done or stopped
Gate runs	How many times you ran make gate
First gate	pass or fail for the first run
Deviations	Anything you did that the task did not say, or none
Notes	Problems you hit and how you solved them, in one or two sentences