chore: add an AGENTS.md

.claude/.gitignore

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+CLAUDE.local.md
+settings.local.json
+worktrees/
+plans/

.claude/CLAUDE.md

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+@../AGENTS.md

.claude/settings.json

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+{
+  "permissions": {
+    "allow": [
+      "Bash(echo:*)",
+      "Bash(gh issue view:*)",
+      "Bash(gh label list:*)",
+      "Bash(gh pr checks:*)",
+      "Bash(gh pr diff:*)",
+      "Bash(gh pr list:*)",
+      "Bash(gh pr status:*)",
+      "Bash(gh pr update-branch:*)",
+      "Bash(gh pr view:*)",
+      "Bash(gh search code:*)",
+      "Bash(git diff:*)",
+      "Bash(git grep:*)",
+      "Bash(git log:*)",
+      "Bash(git show:*)",
+      "Bash(git status:*)",
+      "Bash(grep:*)",
+      "Bash(ls:*)",
+      "Bash(node --version:*)",
+      "Bash(npm --version:*)",
+      "Bash(npm config:*)",
+      "Bash(npm install)",
+      "Bash(npm install:*)",
+      "Bash(npm run build:*)",
+      "Bash(npm run lint:*)",
+      "Bash(npm run lint:fix:*)",
+      "Bash(npm test:*)",
+      "Bash(tree:*)",
+      "WebFetch(domain:docs.slack.dev)",
+      "WebFetch(domain:github.com)",
+      "WebFetch(domain:npmjs.com)",
+      "WebFetch(domain:raw.githubusercontent.com)"
+    ]
+  }
+}

AGENTS.md

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+# AGENTS.md — node-slack-sdk
+
+Instructions for AI coding agents working on this repository.
+
+## Project Overview
+
+- **Repository**: https://github.com/slackapi/node-slack-sdk
+- **Documentation**: https://docs.slack.dev/tools/node-slack-sdk/
+- **Monorepo** managed with npm workspaces, TypeScript-first
+- Publishes multiple `@slack/*` packages to npm
+
+## Package Architecture
+
+| Package | Folder | Description |
+|---------|--------|-------------|
+| [`@slack/web-api`](https://www.npmjs.com/package/@slack/web-api) | `packages/web-api` | Core Web API client (most complex package) |
+| [`@slack/types`](https://www.npmjs.com/package/@slack/types) | `packages/types` | Shared Slack platform TypeScript types (Block Kit, events, etc.) |
+| [`@slack/logger`](https://www.npmjs.com/package/@slack/logger) | `packages/logger` | Logging utility used by other packages |
+| [`@slack/webhook`](https://www.npmjs.com/package/@slack/webhook) | `packages/webhook` | Incoming webhook client |
+| [`@slack/oauth`](https://www.npmjs.com/package/@slack/oauth) | `packages/oauth` | OAuth flow handling and token management |
+| [`@slack/socket-mode`](https://www.npmjs.com/package/@slack/socket-mode) | `packages/socket-mode` | WebSocket-based real-time event client |
+| [`@slack/cli-hooks`](https://www.npmjs.com/package/@slack/cli-hooks) | `packages/cli-hooks` | CLI integration hooks for Slack CLI |
+
+Additional internal packages: `cli-test` (test utilities), `rtm-api` (legacy RTM client).
+
+### Dependency Graph (Build Order)
+
+```txt
+Independent (no internal deps): cli-hooks, cli-test
+Base:                           logger, types
+Depends on base:                web-api, webhook
+Depends on web-api:             oauth, rtm-api, socket-mode
+```
+
+Build packages in this order — a package can only be built after its dependencies.
+
+## Build System
+
+```bash
+# Install all dependencies from the repo root
+npm install
+
+# Lint all packages (Biome)
+npm run lint
+npm run lint:fix
+
+# Build a specific package
+npm run build --workspace=packages/web-api
+
+# Test a specific package
+npm test --workspace=packages/web-api
+```
+
+### Full Build Order (from CI)
+
+```bash
+# 1. No internal dependencies
+npm run build --workspace=@slack/cli-hooks
+npm run build --workspace=@slack/cli-test
+
+# 2. Base dependencies
+npm run build --workspace=@slack/logger
+npm run build --workspace=@slack/types
+
+# 3. Packages requiring base dependencies
+npm run build --workspace=@slack/web-api
+npm run build --workspace=@slack/webhook
+
+# 4. Packages depending on web-api
+npm run build --workspace=@slack/oauth
+npm run build --workspace=@slack/rtm-api
+npm run build --workspace=@slack/socket-mode
+```
+
+## Critical Rules
+
+1. **Never manually edit `packages/web-api/src/types/response/*.ts`** — these files are auto-generated by `scripts/generate-web-api-types.sh`. They contain a "DO NOT EDIT" banner.
+2. **Request types ARE manually maintained** — `packages/web-api/src/types/request/` is hand-written code; edit these responsibly.
+3. **Build packages in dependency order** — see the dependency graph above.
+4. **Use Biome**, not ESLint or Prettier — config is in `biome.json` at repo root.
+5. **TypeScript 5.9.3**, Node 18+.
+
+## Code Conventions
+
+- **Formatting**: configured in `biome.json`
+- **Test files**: `*.spec.ts` using Mocha + chai + sinon; coverage via c8
+- **Type tests**: `*.test-d.ts` using tsd
+- **Naming conventions for request/response types**:
+  - Request: `{Namespace}{Action}Arguments` (e.g., `ChatPostMessageArguments`)
+  - Response: `{Namespace}{Action}Response` (e.g., `ChatPostMessageResponse`)
+- **Method names**: camelCase matching the Slack API method (e.g., `chat.postMessage` → `postMessage`)
+
+## Adding a New Slack API Method
+
+This is the most common contribution. Follow these steps in order.
+
+### Step 1: Look Up the API Method Documentation
+
+Reference: `https://docs.slack.dev/reference/methods/{method.name}`
+
+For example, for `chat.appendStream`: https://docs.slack.dev/reference/methods/chat.appendStream
+
+### Step 2: Generate Response Types
+
+Run the generation script from the repo root:
+
+```bash
+bash scripts/generate-web-api-types.sh
+```
+
+This script:
+
+1. Clones/updates `slackapi/java-slack-sdk` into `tmp/java-slack-sdk`
+2. Reads JSON response samples from `tmp/java-slack-sdk/json-logs/samples/api/`
+3. Runs `scripts/code_generator.rb` which uses quicktype to generate TypeScript types
+4. Outputs `*Response.ts` files to `packages/web-api/src/types/response/`
+5. Regenerates `packages/web-api/src/types/response/index.ts`
+6. Runs `npm run lint:fix` on the generated files
+
+**Prerequisites**: Ruby and npm must be installed.
+
+Generated response types look like this (example: `ChatAppendStreamResponse.ts`):
+
+```typescript
+import type { WebAPICallResult } from '../../WebClient';
+export type ChatAppendStreamResponse = WebAPICallResult & {
+  channel?: string;
+  error?: string;
+  needed?: string;
+  ok?: boolean;
+  provided?: string;
+  ts?: string;
+};
+```
+
+All generated files extend `WebAPICallResult` and have all properties optional.
+
+**Note**: If the JSON sample doesn't exist yet in `java-slack-sdk`, the API method has not been added to that project yet. The maintainers need to add it there first before it can be added here.
+
+### Step 3: Add Request Argument Types
+
+File: `packages/web-api/src/types/request/<namespace>.ts`
+
+Create an interface/type for the method's arguments. Reuse mixins from `packages/web-api/src/types/request/common.ts`:
+
+| Mixin | Purpose |
+|-------|---------|
+| `TokenOverridable` | Optional `token` override |
+| `CursorPaginationEnabled` | `cursor` + `limit` pagination |
+| `TimelinePaginationEnabled` | `oldest` + `latest` + `inclusive` pagination |
+| `TraditionalPagingEnabled` | `count` + `page` pagination |
+| `OptionalTeamAssignable` | Optional `team_id` |
+| `LocaleAware` | Optional `include_locale` |
+
+Also reuse namespace-specific mixins from the same file (e.g., `Channel`, `ChannelAndTS`, `AsUser` in `chat.ts`).
+
+**Example** — `ChatAppendStreamArguments` from `packages/web-api/src/types/request/chat.ts`:
+
+```typescript
+export interface ChatAppendStreamArguments extends TokenOverridable, ChannelAndTS, Partial<MarkdownText> {
+  /**
+   * @description An array of chunk objects to append to the stream.
+   * Either `markdown_text` or `chunks` is required.
+   */
+  chunks?: AnyChunk[];
+}
+```
+
+### Step 4: Export Request Types
+
+File: `packages/web-api/src/types/request/index.ts`
+
+Add the new type to the appropriate export block:
+
+```typescript
+export type {
+  ChatAppendStreamArguments,
+  ChatStartStreamArguments,
+  ChatStopStreamArguments,
+  // ... existing exports
+} from './chat';
+```
+
+### Step 5: Add Method Binding
+
+File: `packages/web-api/src/methods.ts`
+
+1. Import the argument and response types at the top of the file.
+2. Add a method binding in the appropriate namespace object of the `Methods` class.
+
+**Import pattern**:
+
+```typescript
+// Request types are imported from the request index barrel
+import type {
+  ChatAppendStreamArguments,
+  // ...
+} from './types/request';
+
+// Response types are imported from individual files
+import type { ChatAppendStreamResponse } from './types/response/ChatAppendStreamResponse';
+```
+
+**Note**: Request types are imported from the barrel `./types/request` (already grouped by namespace), but response types are imported from their individual files (e.g., `./types/response/ChatAppendStreamResponse`).
+
+**Binding pattern** — within the appropriate namespace object in the `Methods` class:
+
+```typescript
+public readonly chat = {
+  /**
+   * @description Appends text to an existing streaming conversation.
+   * @see {@link https://docs.slack.dev/reference/methods/chat.appendStream `chat.appendStream` API reference}.
+   */
+  appendStream: bindApiCall<ChatAppendStreamArguments, ChatAppendStreamResponse>(this, 'chat.appendStream'),
+  // ...
+};
+```
+
+**`bindApiCall` vs `bindApiCallWithOptionalArgument`**:
+
+- `bindApiCall` — for methods with **required** arguments (most methods)
+- `bindApiCallWithOptionalArgument` — for methods where **all arguments are optional**
+
+### Step 6: Add Type Tests
+
+File: `packages/web-api/test/types/methods/<namespace>.test-d.ts`
+
+Add both sad path (should error) and happy path (should compile) tests:
+
+```typescript
+import { expectAssignable, expectError } from 'tsd';
+import { WebClient } from '../../../src/WebClient';
+
+const web = new WebClient('TOKEN');
+
+// chat.appendStream
+// -- sad path
+expectError(web.chat.appendStream()); // lacking argument
+expectError(web.chat.appendStream({})); // empty argument
+expectError(
+  web.chat.appendStream({
+    channel: 'C1234', // missing ts and markdown_text
+  }),
+);
+
+// -- happy path
+expectAssignable<Parameters<typeof web.chat.appendStream>>([
+  {
+    channel: 'C1234',
+    ts: '1234.56',
+    markdown_text: 'hello',
+  },
+]);
+```
+
+### Summary Checklist
+
+- [ ] Looked up method docs at `https://docs.slack.dev/reference/methods/{method.name}`
+- [ ] Generated response types via `scripts/generate-web-api-types.sh` (or created manually if JSON sample unavailable)
+- [ ] Added request argument type in `packages/web-api/src/types/request/<namespace>.ts`
+- [ ] Exported new request type from `packages/web-api/src/types/request/index.ts`
+- [ ] Imported argument + response types in `packages/web-api/src/methods.ts`
+- [ ] Added method binding with `bindApiCall` in appropriate namespace in `packages/web-api/src/methods.ts`
+- [ ] Added sad/happy path type tests in `packages/web-api/test/types/methods/<namespace>.test-d.ts`
+- [ ] Verified: `npm test --workspace=packages/web-api`
+
+## Code Generation Details
+
+### `scripts/generate-web-api-types.sh`
+
+Entry point for response type generation. It:
+
+1. Clones or pulls `slackapi/java-slack-sdk` into `tmp/`
+2. Runs `npm install` in `scripts/` to install quicktype
+3. Executes `scripts/code_generator.rb`
+4. Runs `npm run lint:fix` on `packages/web-api`
+
+## Testing
+
+- **Unit tests**: Mocha + chai + sinon (`*.spec.ts` files), coverage via c8
+- **Type tests**: tsd (`*.test-d.ts` files in `packages/web-api/test/types/`)
+- **Integration tests**: CommonJS, ESM, and TypeScript compatibility checks
+- **CI matrix**: Node 18.x, 20.x, 22.x on Ubuntu + Windows
+
+Per-package test commands:
+
+```bash
+npm test --workspace=packages/web-api       # all tests (types + integration + unit)
+npm run test:unit --workspace=packages/web-api
+npm run test:types --workspace=packages/web-api
+```
+
+## Web API Client Architecture
+
+`packages/web-api/src/WebClient.ts`:
+
+- Extends the `Methods` class (which defines all API method bindings in `methods.ts`)
+- Uses Axios for HTTP requests
+- `p-queue` for request concurrency control
+- `p-retry` for automatic retries with backoff
+- Built-in cursor pagination via `paginate()`
+- Streaming support via `chatStream()` using `ChatStreamer`
+- Rate limiting with emitted events
+
+## Common Pitfalls
+
+- **Don't edit generated response types** — use `scripts/generate-web-api-types.sh` instead. Look for the "DO NOT EDIT" banner.
+- **Build in dependency order** — building `web-api` before `logger` and `types` will fail.
+- **Use Biome, not ESLint/Prettier** — this repo uses Biome exclusively (`biome.json`).
+- **Biome overrides exist for generated code** — `packages/web-api/src/types/response/**/*.ts` has relaxed rules (`noBannedTypes: off`, `noExplicitAny: off`).
+- **Import organization is disabled** for `packages/web-api/src/index.ts` in Biome config.
+- **Response type imports use individual files**, not the barrel — e.g., `import type { ChatPostMessageResponse } from './types/response/ChatPostMessageResponse'`.
+
+## Development Philosophy
+
+- **Follow existing patterns exactly** — when adding a new method, match the style of adjacent methods.
+- **Reuse mixins** from `common.ts` and namespace-specific files rather than duplicating field definitions.
+- **Every API method needs four things**: request type, response type, method binding, and type tests.
+- **Naming conventions**: PascalCase for types (`ChatPostMessageArguments`), camelCase for methods (`postMessage`).
+- **JSDoc on method bindings**: Always include `@description` and `@see` with a link to the API reference.