docs: add AGENTS.md for block example guidelines

block-kit/AGENTS.md

@@ -0,0 +1,83 @@
+# Adding a Block Example
+
+A block example is **code-complete** when all four of these are present:
+
+1. Example file
+2. Test file
+3. README entry
+4. Correct docstring
+
+## Example file
+
+Create `src/blocks/{type}.py`:
+
+```python
+from slack_sdk.models.blocks import {Type}Block
+from slack_sdk.models.blocks.basic_components import MarkdownTextObject, PlainTextObject
+from slack_sdk.models.blocks.block_elements import ButtonElement, ImageElement
+
+
+def example01() -> {Type}Block:
+    """
+    {Description from docs page — must match exactly}.
+    https://docs.slack.dev/reference/block-kit/blocks/{type}-block/
+
+    {Brief description of this specific example}.
+    """
+    block = {Type}Block(
+        # fields here
+    )
+    return block
+```
+
+Rules:
+- One file per block type in `src/blocks/`
+- Each example is a module-level function returning the block type
+- Functions named `example01()`, `example02()`, etc. with return type annotation
+- Import blocks from `slack_sdk.models.blocks`
+- Import text objects from `slack_sdk.models.blocks.basic_components`
+- Import elements from `slack_sdk.models.blocks.block_elements`
+- The docstring first line must match the docs page `description` field exactly (found in the page's YAML frontmatter)
+
+## Test file
+
+Create `tests/blocks/test_{type}.py`:
+
+```python
+import json
+
+from src.blocks import {type}
+
+
+def test_example01():
+    block = {type}.example01()
+    actual = block.to_dict()
+    expected = {
+        "type": "{type}",
+        # fields matching the docs JSON example
+    }
+    assert json.dumps(actual, sort_keys=True) == json.dumps(expected, sort_keys=True)
+```
+
+The expected dict must match the docs page JSON example exactly (minus the outer `"blocks": [...]` wrapper).
+
+## README entry
+
+Add an entry to `block-kit/README.md` in alphabetical order under `### Blocks`:
+
+```markdown
+- **[{Name}](https://docs.slack.dev/reference/block-kit/blocks/{type}-block)**: {Description matching docs}. [Implementation](./src/blocks/{type}.py).
+```
+
+The description must match the docs page `description` field exactly.
+
+## Lint and verify
+
+```bash
+cd block-kit
+ruff check src/blocks/{type}.py tests/blocks/test_{type}.py
+ruff format --check src/blocks/{type}.py tests/blocks/test_{type}.py
+pytest tests/blocks/test_{type}.py
+```
+
+All must pass. Use `ruff format` (without `--check`) to auto-fix formatting.