docs: consolidate design documentation and standardize crate English

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2026-10-12 14:58:00 +09:00
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# agen-macros
Procedural macros used by [`agen`](https://crates.io/crates/agen) to declare LLM tools from Rust methods.
`agen-macros` generates `agen` tool definitions and implementations from Rust
method declarations. It isolates procedural macro expansion from `agen`, which
owns tool registration and execution.
Applications should normally depend only on `agen` and import its re-exports:
## Design entry points
```rust
use agen::tool_registry;
#[derive(Clone)]
struct Tools;
#[tool_registry]
impl Tools {
/// Returns the supplied text.
#[tool]
async fn echo(
&self,
#[description = "Text to return"] text: String,
) -> Result<String, std::io::Error> {
Ok(text)
}
}
```
`#[tool_registry]` generates the argument schema, a `Tool` implementation, and an `<method>_definition` constructor. It rejects arguments of its own, duplicate `#[tool]` markers, malformed or duplicate `#[description = "..."]` attributes, and non-identifier argument patterns.
Generated code targets the canonical `::agen` path and uses implementation dependencies re-exported by `agen`; consumers do not need direct `serde`, `schemars`, `serde_json`, or `async-trait` dependencies. Renaming the `agen` dependency in `Cargo.toml` is not currently supported.
This companion package is published before the matching `agen` release. Its public contract is the generated API consumed by `agen`, and its minor version compatibility follows the `agen` 0.2 series.
Licensed under the [MIT License](https://gitea.hareworks.net/Hare/yoi/src/branch/develop/LICENSE).
- [`tool_registry`]: declaration validation, argument schemas, and execution wrappers