chore(app-server): update AGENTS.md for config + optional collection guidance (#10914)

Based on recent app-server PRs
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Owen Lin 2026-02-06 12:45:27 -08:00 committed by GitHub
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@ -128,15 +128,11 @@ These guidelines apply to app-server protocol work in `codex-rs`, especially:
`*Params` for request payloads, `*Response` for responses, and `*Notification` for notifications.
- Expose RPC methods as `<resource>/<method>` and keep `<resource>` singular (for example, `thread/read`, `app/list`).
- Always expose fields as camelCase on the wire with `#[serde(rename_all = "camelCase")]` unless a tagged union or explicit compatibility requirement needs a targeted rename.
- Exception: config RPC payloads are expected to use snake_case to mirror config.toml keys (see the config read/write/list APIs in `app-server-protocol/src/protocol/v2.rs`).
- Always set `#[ts(export_to = "v2/")]` on v2 request/response/notification types so generated TypeScript lands in the correct namespace.
- Never use `#[serde(skip_serializing_if = "Option::is_none")]` for v2 API payload fields.
Exception: client->server requests that intentionally have no params may use:
`params: #[ts(type = "undefined")] #[serde(skip_serializing_if = "Option::is_none")] Option<()>`.
- For client->server JSON-RPC request payloads (`*Params`) only, every optional field must be annotated with `#[ts(optional = nullable)]`. Do not use `#[ts(optional = nullable)]` outside client->server request payloads (`*Params`).
- For client->server JSON-RPC request payloads only, and you want to express a boolean field where omission means `false`, use `#[serde(default, skip_serializing_if = "std::ops::Not::not")] pub field: bool` over `Option<bool>`.
- For new list methods, implement cursor pagination by default:
request fields `pub cursor: Option<String>` and `pub limit: Option<u32>`,
response fields `pub data: Vec<...>` and `pub next_cursor: Option<String>`.
- Keep Rust and TS wire renames aligned. If a field or variant uses `#[serde(rename = "...")]`, add matching `#[ts(rename = "...")]`.
- For discriminated unions, use explicit tagging in both serializers:
`#[serde(tag = "type", ...)]` and `#[ts(tag = "type", ...)]`.
@ -145,6 +141,15 @@ These guidelines apply to app-server protocol work in `codex-rs`, especially:
- For experimental API surface area:
use `#[experimental("method/or/field")]`, derive `ExperimentalApi` when field-level gating is needed, and use `inspect_params: true` in `common.rs` when only some fields of a method are experimental.
### Client->server request payloads (`*Params`)
- Every optional field must be annotated with `#[ts(optional = nullable)]`. Do not use `#[ts(optional = nullable)]` outside client->server request payloads (`*Params`).
- Optional collection fields (for example `Vec`, `HashMap`) must use `Option<...>` + `#[ts(optional = nullable)]`. Do not use `#[serde(default)]` to model optional collections, and do not use `skip_serializing_if` on v2 payload fields.
- When you want omission to mean `false` for boolean fields, use `#[serde(default, skip_serializing_if = "std::ops::Not::not")] pub field: bool` over `Option<bool>`.
- For new list methods, implement cursor pagination by default:
request fields `pub cursor: Option<String>` and `pub limit: Option<u32>`,
response fields `pub data: Vec<...>` and `pub next_cursor: Option<String>`.
### Development Workflow
- Update docs/examples when API behavior changes (at minimum `app-server/README.md`).