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boxmaker/docs/plans/M3b/01-proto-tools-hosts.md
kyleandClaude Opus 5.5 5e55fe4c66 M3b plan: every task's git add includes Cargo.lock
Task 04 added dependencies to toolkit and its git add line left out the lock
file, so the driver stopped on an unclean tree. The lock change is folded into
task 04's commit.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-09-23 00:00:12 -07:00

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# M3b task 01: the tools' arguments and the host rules move to `proto`
**Branch:** `m3b` (create it: `git switch master && git switch -c m3b`; `git status --short` must be
empty first, otherwise stop)
**Commit subject:** `Move the tools' arguments and the host rules to proto`
## Goal
Two programs will now read the same things: `brokerd` parses the model's tool arguments and checks
hosts, and `toolkit` (inside the container) reads the same arguments and checks the same hosts.
Each must have **one** definition. Move them into `proto`; `brokerd` uses them from there. Nothing
changes in behaviour: every existing test passes unchanged.
## Files
- Copy: `crates/proto/tests/tools.rs`, `crates/proto/tests/hosts.rs`
- Create: `crates/proto/src/tools.rs`, `crates/proto/src/hosts.rs`
- Modify: `crates/proto/src/lib.rs`, `crates/brokerd/src/args.rs`, `docs/implementer-log.md`
## Interfaces
`crates/proto/src/tools.rs` (module doc: the four tools' arguments, shared by `brokerd` and
`toolkit`):
```rust
use serde::{Deserialize, Serialize};
// Each: #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)] #[serde(deny_unknown_fields)]
pub struct ReadFileArgs { pub path: String }
pub struct WriteFileArgs { pub path: String, pub content: String }
pub struct ShellArgs {
pub command: String,
#[serde(default, skip_serializing_if = "Option::is_none")]
pub cwd: Option<String>,
}
pub struct HttpFetchArgs { pub url: String }
```
These are the four private structs at the bottom of `brokerd/src/args.rs` today (`ReadFileArgs`,
`WriteFileArgs`, `ShellArgs`, `HttpFetchArgs`), made public, with `Debug, Clone, PartialEq, Eq`
added. **Move** them: delete them from `args.rs` and `use proto::tools::{…}` there instead.
`crates/proto/src/hosts.rs` (module doc: host names and patterns, shared by `brokerd` and the
egress proxy):
```rust
pub fn valid_host(host: &str) -> bool;
pub fn valid_host_pattern(pattern: &str) -> bool;
pub fn host_matches(pattern: &str, host: &str) -> bool;
fn valid_label(label: &str) -> bool; // private, as it is now
```
**Move** these four functions from `brokerd/src/args.rs`, bodies and doc comments unchanged. In
`args.rs`, where they were, put:
```rust
/// Moved to `proto::hosts` in M3b, so `toolkit` checks hosts with the same rules.
pub use proto::hosts::{host_matches, valid_host, valid_host_pattern};
```
so that `brokerd::args::valid_host` and the others still exist for `brokerd`'s code and tests.
`url_host`, `valid_path`, `inside` and `MAX_URL` stay in `args.rs`.
In `crates/proto/src/lib.rs`: add `pub mod hosts;` and `pub mod tools;` in alphabetical order with
the other `pub mod` lines. No `pub use` for them: callers write `proto::tools::ShellArgs` and
`proto::hosts::host_matches`.
`args.rs` no longer needs `use serde::{Deserialize, Serialize};` once the structs are gone; remove
it if the compiler says it is unused.
## Steps
- [ ] **1. Branch and copy.** `git switch master && git switch -c m3b`, then
`cp docs/plans/M3b/files/crates/proto/tests/tools.rs docs/plans/M3b/files/crates/proto/tests/hosts.rs crates/proto/tests/`
- [ ] **2. See them fail.** `cargo test -p proto --test tools --test hosts`. Expected: they do not
compile (`proto::tools` and `proto::hosts` do not exist).
- [ ] **3. Move the code** as above. Run `cargo fmt --all`.
- [ ] **4. See them pass.** `cargo test -p proto --test tools --test hosts`. Expected: 3 and 3
passed. Then `cargo test -p brokerd --test args --test grants --test policy`: all pass, unchanged.
- [ ] **5. Check nothing is defined twice.** `grep -rn "fn valid_host\|struct ShellArgs" crates/`
must show only `crates/proto/src/`.
- [ ] **6. Run the gate.** `make gate`. Expected last line: `gate: ok`.
- [ ] **7. Log and commit.** Add your row to `docs/implementer-log.md`, then
`git add crates/proto crates/brokerd docs/implementer-log.md Cargo.lock && git commit`
## Done when
- Both new suites pass, every existing suite passes, `make gate` prints `gate: ok`.
## Stop and report if
- A given test needs a change to pass.
- An existing test fails after the move.