Feishu Block Operations

Direct REST API operations for Feishu cloud documents when the feishu_doc tool's built-in actions don't cover your needs.

When to Use This (vs feishu_doc)

Authentication

Get tenant access token from OpenClaw config:

import json, urllib.request

def get_feishu_token():
    with open(os.path.expanduser("~/.openclaw/openclaw.json")) as f:
        c = json.load(f)["channels"]["feishu"]
    payload = json.dumps({"app_id": c["appId"], "app_secret": c["appSecret"]}).encode()
    req = urllib.request.Request(
        "https://open.feishu.cn/open-apis/auth/v3/tenant_access_token/internal",
        data=payload, headers={"Content-Type": "application/json"}, method="POST")
    return json.loads(urllib.request.urlopen(req).read())["tenant_access_token"]

All API calls use header: Authorization: Bearer {token}

Rate Limits

Use time.sleep(0.35) between write calls. For reads, time.sleep(0.25).

API Reference

Base URL: https://open.feishu.cn/open-apis/docx/v1/documents

1. Get Block

GET /docx/v1/documents/{doc}/blocks/{block_id}

Returns single block with full content (type, elements, children IDs, styles).

2. Get Children (with optional full tree)

GET /docx/v1/documents/{doc}/blocks/{block_id}/children
    ?with_descendants=true    # get ALL descendants, not just direct children
    &page_size=500            # max 500
    &document_revision_id=-1  # latest revision

Tip: Use with_descendants=true on table blocks to get all cells + cell content in one call.

3. Create Blocks (simple, flat only)

POST /docx/v1/documents/{doc}/blocks/{parent_id}/children
Body: {"children": [...blocks], "index": 0}

• Max 50 blocks per call
• Cannot create nested structures (e.g. table with cell content)
• index in body: 0=beginning, -1=end (default)

4. Create Nested Blocks (tables, grids, etc.)

POST /docx/v1/documents/{doc}/blocks/{parent_id}/descendant
Body: {
    "children_id": ["temp_id_1", "temp_id_2"],
    "descendants": [...all_blocks_with_parent_child_relations],
    "index": 0
}

• Max 1000 blocks per call
• children_id: only first-level child IDs (NOT grandchildren — causes error 1770006)
• descendants: flat array of ALL blocks including nested ones, each with block_id, block_type, children (list of child temp IDs)
• ⚠️ index MUST be in request body, NOT as URL query parameter — ?index=N is silently ignored

5. Batch Update Blocks

PATCH /docx/v1/documents/{doc}/blocks/batch_update
Body: {"requests": [...update_requests]}

Max 200 blocks per call. Each request object contains block_id + one operation:

Example: batch update text in multiple cells

requests = []
for block_id, new_text in updates.items():
    requests.append({
        "block_id": block_id,
        "update_text_elements": {
            "elements": [{"text_run": {"content": new_text}}]
        }
    })

api_call(token, "PATCH",
    f"https://open.feishu.cn/open-apis/docx/v1/documents/{doc}/blocks/batch_update",
    {"requests": requests})

6. Update Single Block

PATCH /docx/v1/documents/{doc}/blocks/{block_id}
Body: {same operations as batch_update, without block_id wrapper}

7. Delete Blocks

DELETE /docx/v1/documents/{doc}/blocks/{parent_id}/children/batch_delete
Body: {"start_index": 0, "end_index": 5}

• ⚠️ Uses start_index/end_index (half-open interval [start, end)), NOT block_ids
• Indices are relative to the parent block's children list

Block Types

Text Elements

Text blocks contain an elements array. Each element is one of:

# Plain text
{"text_run": {"content": "hello", "text_element_style": {"bold": True, "link": {"url": "..."}}}}

# Mention user
{"mention_user": {"user_id": "ou_xxx", "text_element_style": {}}}

# Mention document
{"mention_doc": {"token": "xxx", "obj_type": 22, "text_element_style": {}}}

# Equation (LaTeX)
{"equation": {"content": "E=mc^2"}}

# Reminder
{"reminder": {"expire_time": 1234567890, "is_whole_day": True}}

Common Patterns

Pattern 1: Read table content

# 1. Get table's descendants in one call
url = f".../blocks/{table_block_id}/children?with_descendants=true&page_size=500&document_revision_id=-1"
items = api_call(token, "GET", url)["data"]["items"]

# 2. Extract text from cells
for item in items:
    if item["block_type"] == 2 and "text" in item:
        text = "".join(e.get("text_run", {}).get("content", "") for e in item["text"]["elements"])

Pattern 2: Insert Markdown at position

Use feishu-md2blocks skill's md2blocks.py script with --after \x3Cblock_id>.

Or manually:

# 1. Convert markdown
convert_resp = api_call(token, "POST", ".../blocks/convert",
    {"content_type": "markdown", "content": md_text})

# 2. Clean table blocks (remove merge_info)
for block in convert_resp["data"]["blocks"]:
    if block.get("block_type") == 31 and "table" in block:
        block["table"]["property"].pop("merge_info", None)

# 3. Insert at position (index IN BODY)
api_call(token, "POST", f".../blocks/{parent_id}/descendant", {
    "children_id": convert_resp["data"]["first_level_block_ids"],
    "descendants": convert_resp["data"]["blocks"],
    "index": target_index
})

Pattern 3: Batch edit table cells

# 1. Get all descendants of table
items = get_descendants(table_id)

# 2. Build update map
updates = []
for item in items:
    if needs_update(item):
        updates.append({
            "block_id": item["block_id"],
            "update_text_elements": {
                "elements": [{"text_run": {"content": new_value}}]
            }
        })

# 3. Batch update (max 200 per call)
for i in range(0, len(updates), 200):
    api_call(token, "PATCH", f".../blocks/batch_update",
        {"requests": updates[i:i+200]})
    time.sleep(0.35)

Pattern 4: Delete then re-insert (position workaround)

When you need to replace content at a specific position:

# 1. Find the index range to replace
children = get_doc_children(doc)
start_idx = children.index(first_block_to_replace)
end_idx = children.index(last_block_to_replace) + 1

# 2. Delete old blocks
api_call(token, "DELETE", f".../children/batch_delete",
    {"start_index": start_idx, "end_index": end_idx})

# 3. Insert new content at same position
api_call(token, "POST", f".../blocks/{doc}/descendant", {
    "children_id": new_ids,
    "descendants": new_blocks,
    "index": start_idx
})

Gotchas & Lessons Learned

1. /descendant index in body, not URL — The most common pitfall. ?index=N compiles but is silently ignored.
2. batch_delete uses index range — {"start_index": 0, "end_index": 5} deletes children[0..4]. Do NOT pass block_ids.
3. Table merge_info is read-only — Must strip from blocks before insertion or API returns error.
4. children_id is first-level only — Including grandchild IDs in children_id causes error 1770006.
5. Rate limit is per-document — Multiple concurrent edits to the same doc share the 3/sec limit.
6. with_descendants=true saves calls — One GET instead of N+1 for reading table content.
7. Convert API returns temp IDs — After insertion, actual block IDs differ from the temp IDs used during convert.