ailang-parse 0.8.0

Python client and MCP server for the AILANG Parse document parsing API

AILANG Parse Python SDK

Python client and MCP server for the AILANG Parse document parsing API. Parse 16 formats (including LaTeX/arXiv and RTF), generate 8 — zero dependencies for Office, pluggable AI for PDFs.

Install

pip install ailang-parse

MCP Server (Claude Desktop, Cursor, VS Code)

Run as a stdio MCP server that bridges to the hosted AILANG Parse API. Stdlib only — works in any Python >= 3.8 environment.

{
  "mcpServers": {
    "ailang-parse": {
      "command": "uvx",
      "args": ["ailang-parse", "mcp"]
    }
  }
}

Add to claude_desktop_config.json (Claude Desktop), .cursor/mcp.json (Cursor), or .vscode/settings.json (VS Code). Provides 7 tools: parse, convert, formats, estimate, auth, auth-poll, and account.

Quick Start

from ailang_parse import DocParse

client = DocParse(api_key="dp_your_key_here")

# Parse a document
result = client.parse("report.docx")
print(f"{len(result.blocks)} blocks, format: {result.format}")

for block in result.blocks:
    if block.type == "heading":
        print(f"  H{block.level}: {block.text}")
    elif block.type == "table":
        print(f"  Table: {len(block.headers)} cols, {len(block.rows)} rows")
    elif block.type == "change":
        print(f"  {block.change_type} by {block.author}: {block.text}")
    else:
        print(f"  {block.type}: {block.text[:80]}")

Parse Documents

# Parse with different output formats
result = client.parse("report.docx")                        # Block ADT (default)
result = client.parse("report.docx", output_format="markdown")  # Markdown
result = client.parse("report.docx", output_format="html")      # HTML
result = client.parse("report.docx", output_format="markdown+metadata")  # Markdown with sections

# Upload a local file (multipart)
result = client.parse_file("local/report.docx")

# Parse from a signed URL (GCS, S3, Azure Blob — no local file needed)
result = client.parse_url(
    "https://storage.googleapis.com/bucket/doc.docx?X-Goog-Signature=...",
    output_format="markdown+metadata",
)

# Access structured data
print(result.status)          # "success"
print(result.filename)        # "report.docx"
print(result.format)          # "zip-office"
print(result.blocks)          # List[Block]
print(result.metadata.title)  # Document title
print(result.metadata.author) # Document author
print(result.summary.tables)  # Number of tables found

# markdown+metadata format includes sections
print(result.markdown)        # Full rendered markdown
for section in result.sections:
    print(f"  {section.heading}: {section.markdown[:60]}...")

Response Metadata

Every parse result includes quota and request metadata from response headers:

result = client.parse("report.docx")
meta = result.response_meta

print(meta.request_id)            # "req_abc123"
print(meta.tier)                  # "free", "pro", or "business"
print(meta.quota_remaining_day)   # Requests left today
print(meta.quota_remaining_month) # Requests left this month
print(meta.quota_remaining_ai)    # AI requests remaining
print(meta.format)                # Detected input format ("docx", etc.)
print(meta.replayable)            # Whether this request can be replayed

Error Handling

Every error type carries the response headers — request_id for log correlation, replayable for retry decisions, plus details and suggested_fix from the response body:

from ailang_parse import DocParse, DocParseError, AuthError, QuotaError

client = DocParse()
try:
    result = client.parse_file("report.docx")
except AuthError as e:
    log.error("auth: %s request_id=%s", e, e.request_id)
except QuotaError as e:
    log.error("quota tier=%s request_id=%s", e.tier, e.request_id)
except DocParseError as e:
    log.error("error: %s status=%d replayable=%s request_id=%s",
              e, e.status_code, e.replayable, e.request_id)

Retries

Opt in to retries with RetryPolicy. respect_replayable honours the server-provided X-AilangParse-Replayable header so 5xx responses the server explicitly marks safe-to-retry are attempted again:

from ailang_parse import DocParse, RetryPolicy

client = DocParse(retry=RetryPolicy(
    max_retries=3,
    retryable_statuses={502, 503, 504},
    respect_replayable=True,
))

Parse from GCS

The parse_gs_uri convenience signs a gs:// URI and parses it in one call. Requires the gcs extra:

pip install 'ailang-parse[gcs]'

result = client.parse_gs_uri(
    "gs://my-bucket/path/to/doc.pdf",
    ttl=900,
    output_format="markdown+metadata",
)

Auth defaults to Application Default Credentials; pass an explicit credentials= (or service_account_email=) to override.

Signing strategy (auto-detected)

• JSON-key credentials (GOOGLE_APPLICATION_CREDENTIALS pointing at an SA key file) → URL is signed locally with the private key. Fast, no extra API call.
• Token-only credentials (Cloud Run, GCE, GKE metadata server, or gcloud auth application-default login) → URL is signed via Google's IAM SignBlob API. No private key needed.

Cloud Run setup (one-time): the runtime service account needs roles/iam.serviceAccountTokenCreator on itself:

SA="[e-mail]"
gcloud iam service-accounts add-iam-policy-binding "$SA" \
  --member="serviceAccount:$SA" \
  --role="roles/iam.serviceAccountTokenCreator"

After the grant, client.parse_gs_uri("gs://...") works from any Cloud Run service running as that SA with no further config.

For impersonation flows, pass an explicit service_account_email="[e-mail]".

RAG Chunking

result.flatten(policy) turns the Block ADT into JSON-friendly chunks ready for an embedder. The default policy emits text, headings, table rows (with header context), and lists — and tracks section ancestry:

from ailang_parse import FlattenPolicy

chunks = result.flatten(FlattenPolicy(
    max_chunk_chars=4000,
    embed_images=True,             # always emits ImageBlock chunks (placeholder if no caption)
    embed_changes=True,            # ChangeBlock + author metadata -> chunk
    embed_comments=True,           # CommentBlock + author + resolved -> chunk
    on_table="row",                # "row" (default), "whole", or callable(block, meta) -> [Chunk]
    on_table_cell_newlines="space",  # "preserve" (default) | "escape" | "space"
    on_table_cell_pipes="escape",  # same modes — round-trippable structured retrieval
    section_path=True,
))

for c in chunks:
    embed(c.text, metadata=c.metadata.to_dict())

Custom chunk metadata

Use metadata.extras to carry consumer-defined fields. The on_table callable receives a mutable ChunkMetadata and can populate it:

def my_table(block, md):
    md.extras["tenant_id"] = "acme"
    md.extras["confidence"] = 0.93
    return [Chunk(text=..., metadata=md)]

chunks = result.flatten(FlattenPolicy(on_table=my_table))

extras values should be JSON-serializable — they pass through to Pinecone/Vertex/Chroma metadata unchanged.

Image visibility

embed_images=True always emits an ImageBlock chunk. When the image has no AI caption, the chunk text is a placeholder ("[image: image/png, 12345 bytes]") and metadata.extras["image_has_description"] is False. To match the v0.6.0 "skip empty" behaviour:

chunks = [
    c for c in result.flatten(FlattenPolicy(embed_images=True))
    if c.metadata.block_type != "image"
    or c.metadata.extras.get("image_has_description")
]

Supported Formats

formats = client.formats()
print(formats.parse)       # ['docx', 'pptx', 'xlsx', 'odt', 'odp', 'ods', 'html', 'md', 'csv', 'epub', 'pdf', 'png', 'jpg']
print(formats.generate)    # ['docx', 'pptx', 'xlsx', 'odt', 'odp', 'ods', 'html', 'md']
print(formats.ai_required) # ['pdf', 'png', 'jpg', 'gif', 'bmp', 'tiff']

Block Types

AILANG Parse returns 9 block types:

Type	Fields	Description
text	text, style, level	Paragraphs, code blocks
heading	text, level (1-6)	Document headings
table	headers, rows	Tables with merge tracking
list	items, ordered	Ordered/unordered lists
image	description, mime, data_length	Embedded images
audio	transcription, mime	Audio transcriptions
video	description, mime	Video descriptions
section	kind, children	Slides, sheets, headers/footers
change	change_type, author, date, text	Track changes

Table cells

Table cells can be simple strings or merged cells:

for block in result.blocks:
    if block.type == "table":
        for cell in block.headers:
            print(f"  {cell.text} (colspan={cell.col_span}, merged={cell.merged})")

Nested sections

Section blocks contain child blocks (slides, sheets, headers/footers):

for block in result.blocks:
    if block.type == "section":
        print(f"Section: {block.kind}")  # "slide", "sheet", "header", "footer", etc.
        for child in block.children:
            print(f"  {child.type}: {child.text[:50]}")

API Key Management

API key resolution (checked in order):

1. Explicit api_key parameter
2. DOCPARSE_API_KEY environment variable
3. Saved credentials in ~/.config/ailang-parse/credentials.json

Use the device auth flow to get an API key. The user signs in once — the key is saved automatically and reused in future sessions.

from ailang_parse import DocParse

# First time: device_auth() opens browser, user signs in, key saved to disk
client = DocParse()
client.device_auth(label="my-agent")

# Future sessions: key auto-loaded from ~/.config/ailang-parse/credentials.json
client = DocParse()
result = client.parse("report.docx")

# Or set env var: export DOCPARSE_API_KEY=dp_your_key
client = DocParse()
result = client.parse("report.docx")

# Check usage
usage = client.keys.usage(key_id="abc123", user_id="user123")
print(f"Requests today: {usage.usage.requests_today} / {usage.quota.requests_per_day}")

# Rotate (new key, old one revoked, same tier)
new_key = client.keys.rotate(key_id="abc123", user_id="user123")
print(new_key.key)  # New key

# Revoke
client.keys.revoke(key_id="abc123", user_id="user123")

Migrating from Unstructured

One import change:

# Before
from unstructured_client import UnstructuredClient
client = UnstructuredClient(server_url="https://api.unstructured.io")

# After
from ailang_parse import UnstructuredClient
client = UnstructuredClient(
    server_url="https://api.parse.sunholo.com"
)

# All existing code works unchanged
elements = client.general.partition(file="report.docx")
for el in elements:
    print(f"{el.type}: {el.text[:80]}")
    print(f"  metadata: {el.metadata.filename}")

Error Handling

from ailang_parse import DocParse, DocParseError, AuthError, QuotaError

client = DocParse(api_key="dp_invalid")

try:
    result = client.parse("file.docx")
except AuthError as e:
    print(f"Bad key: {e}")           # 401
except QuotaError as e:
    print(f"Quota exceeded: {e}")    # 429
except DocParseError as e:
    print(f"API error ({e.status_code}): {e}")
    print(f"  suggested fix: {e.suggested_fix}")
    print(f"  details: {e.details}")       # Structured error details dict
    print(f"  request_id: {e.request_id}") # For support/debugging

Configuration

client = DocParse(
    api_key="dp_your_key",
    base_url="https://your-deployment.run.app",  # Custom endpoint
    timeout=120,                                   # Request timeout (seconds)
)

License

Apache 2.0 — see LICENSE for details.

Links

• AILANG Parse Website
• API Documentation
• GitHub
• Swagger UI