flare-plugin-host 0.1.0

# flare-plugin-host

English · [中文](README.zh-CN.md)

Host-side library for Flare capability plugins: declare what your plugin can do,
register it with the platform, withdraw it on shutdown.

## Why a library instead of calling the RPC yourself

Not to save lines — to stop you from **under-calling**.

Registration accepts a partial declaration: leave `declared_operations` empty and
the platform accepts you anyway, marks the instance `unverified`, and the
declaration boundary silently stops applying to it. Nothing errors. Nothing logs
a problem. Your plugin just quietly loses its guarantees.

`PluginDeclaration` makes every one of those fields required, so an incomplete
declaration fails at compile time instead.

## Usage

```rust
use flare_plugin_host::{PluginDeclaration, PluginHost, SeatModel};

let declaration = PluginDeclaration {
    tenant_id: "0".into(),
    plugin_id: "vendorx-invoice".into(),
    capability_id: "vendorx.invoice.create".into(),
    grpc_authority: "10.0.0.7:9000".into(),
    plugin_version: env!("CARGO_PKG_VERSION").into(),
    api_version: "1".into(),
    manifest_sha256: String::new(),
    declared_operations: vec![
        "vendorx.invoice.create".into(),
        "vendorx.invoice.void".into(),
    ],
    labels: Default::default(),
    seat_model: SeatModel::Tenant,
};

PluginHost::connect("http://capability:50110")
    .await?
    .announce(&declaration)
    .await?;
```

**One registration serves every declared operation.** The platform keys the route
book by `(tenant, plugin)` — your process holds a single record, and
`declared_operations` decides what it answers for. `capability_id` is just that
record's label; it does not narrow your reach.

## seat_model is a product decision

| Value | Meaning | Fits |
|---|---|---|
| `Tenant` | Installed by the tenant, usable by everyone in it | Most plugins |
| `PerUser` | Still needs a per-user grant | Marginal-cost (AI billed per token) or compliance-isolated capabilities |

There is no default. Selling a per-token capability per tenant loses more money
the more it is used, so the platform refuses to guess.

## License

Apache-2.0