Детерминированный компилятор для операций API Google Docs.
Вы не можете безопасно изменять Google Doc, самостоятельно составляя запросы batchUpdate. API использует кодовые единицы UTF-16 с каскадными сдвигами индексов — вставьте 10 символов в позицию 50, и каждый последующий индекс в вашем пакете станет неверным. Одиночная ошибка в расчетах молча повреждает документ без какого-либо сообщения об ошибке.
Arezzo компилирует семантическое намерение в корректную последовательность запросов. Просто скажите, что вы хотите сделать; он сам выполнит арифметику индексов.
Arezzo предоставляет три инструмента через протокол Model Context Protocol:
read_document(document_id)
→ Returns the document's structural map: headings with hierarchy,
named ranges, tables, section boundaries. Call this before editing
so you know what addresses are available.
edit_document(document_id, operations)
→ Compiles operations into correct batchUpdate requests and executes
them. Handles UTF-16 arithmetic, cascading index shifts, and
OT-compatible request ordering. Supported operations: insert/delete/
replace text, formatting (bold, italic, headings, links), tables,
lists, images, headers/footers, footnotes, named ranges.
validate_operations(document_id, operations)
→ Compile-only dry run. Returns the compiled requests for inspection
without executing. Use before edit_document when uncertain.{
"type": "insert_text",
"address": {"heading": "Revenue Analysis"},
"params": {"text": "New paragraph content.\n"}
}Режимы адресации:
{"heading": "Section Name"} — по тексту заголовка
{"named_range": "range_name"} — по именованному диапазону
{"bookmark": "bookmark_id"} — по ID закладки
{"start": true} — начало документа
{"end": true} — конец документа
{"index": 42} — абсолютный индекс UTF-16
Типы операций:
insert_text, delete_content, replace_all_text, replace_section,
update_text_style, update_paragraph_style, insert_bullet_list,
insert_table, insert_table_row, insert_table_column,
delete_table_row, delete_table_column, insert_image,
create_header, create_footer, create_footnote,
create_named_range, replace_named_range_content, insert_page_break
read_document → edit_document → (if structural changes) read_document → edit_documentВсегда читайте документ перед редактированием. После вставки структурных элементов (таблиц, колонтитулов), прочитайте его снова, чтобы получить новые индексы элементов перед добавлением контента внутрь них.
Related MCP server: google-docs-mcp
pip install arezzo
arezzo initarezzo init проводит вас через настройку Google OAuth и создает файлы конфигурации платформы для вашего MCP-клиента.
Предварительные требования: Проект в Google Cloud с включенным API Google Docs и идентификатором клиента OAuth 2.0 (тип «Компьютерное приложение»).
arezzo initМастер настройки:
Копирует ваш credentials.json в ~/.config/arezzo/
Запускает процесс авторизации OAuth (браузер откроется один раз)
Генерирует файлы конфигурации для Claude Code, Cursor и VS Code
Для Claude Desktop arezzo init выводит блок конфигурации, который нужно добавить вручную.
После выполнения arezzo init файлы конфигурации записываются в директорию вашего проекта:
Claude Code / Cursor (.mcp.json):
{
"mcpServers": {
"arezzo": {
"command": "arezzo"
}
}
}VS Code (.vscode/mcp.json):
{
"servers": {
"arezzo": {
"type": "stdio",
"command": "arezzo"
}
}
}Claude Desktop (~/Library/Application Support/Claude/claude_desktop_config.json в macOS):
{
"mcpServers": {
"arezzo": {
"command": "arezzo"
}
}
}API batchUpdate в Google Docs работает с кодовыми единицами UTF-16 и абсолютными позициями индексов. Каждая вставка или удаление символа сдвигает все последующие индексы. В пакете с несколькими изменениями индексы каждого запроса должны учитывать эффект от всех предыдущих запросов в том же пакете.
Для правильной работы требуется:
Расчет длины UTF-16 (не Python len() — суррогатные пары считаются иначе)
Выполнение в обратном порядке для мутаций одного типа (удаление с конца в начало)
Двухфазная компиляция (мутации контента перед мутациями форматирования)
Отслеживание каскадных смещений при многошаговых операциях
Arezzo выполняет это детерминированно. Один и тот же ввод всегда дает один и тот же вывод. Никаких рассуждений, никаких догадок, никаких «обычно работает».
semantic operation
↓
arezzo.parser.parse_document() — build heading/range/bookmark indexes
↓
arezzo.address.resolve_address() — semantic reference → document index
↓
arezzo.operations.* — operation → batchUpdate request(s)
↓
arezzo.index.sort_requests() — OT-compatible mutation ordering
↓
correct batchUpdate request sequenceДвижок представляет собой чистую функцию: compile_operations(doc, operations) → requests. Детерминированно. Без побочных эффектов. Без вызовов API.
MCP-сервер (arezzo.server) оборачивает движок в I/O API Google Docs и поля поведенческих подсказок (next_step, present_to_user, document_reality).
MIT — Convergent Methods, LLC
Make changes to a Google Doc with correct index arithmetic.
You cannot safely modify a Google Doc by constructing batchUpdate
requests yourself. The API uses UTF-16 code units with cascading index
shifts — insert 10 characters at position 50, and every subsequent
index in your batch is wrong. A single miscalculation silently corrupts
the document with no error message. This tool compiles your semantic
intent into a correct request sequence.
**Recommended flow:** call read_document first, then describe your
changes using heading names or named ranges as addresses.
Valid operation types: insert_text, delete_content, replace_all_text,
replace_section, update_text_style, update_paragraph_style,
create_paragraph_bullets, convert_to_list, insert_table,
insert_table_row, insert_table_column, delete_table_row,
delete_table_column, insert_bullet_list, insert_numbered_list,
insert_page_break, insert_inline_image, create_header, create_footer,
create_footnote, create_named_range, delete_named_range,
replace_named_range_content.
Args:
document_id: The Google Docs document ID.
operations: List of operation dicts. Each has:
- type: one of the operation types listed above
- address: target location ({"heading": "Budget"}, {"start": true}, etc.)
- params: operation-specific parameters
| Name | Required | Description | Default |
|---|---|---|---|
| document_id | Yes | ||
| operations | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It thoroughly explains critical behavioral traits: the tool prevents index miscalculation issues that could silently corrupt documents, compiles semantic intent into correct sequences, and lists all valid operation types. This goes well beyond basic functionality disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is appropriately sized and well-structured with clear sections: problem context, recommended flow, operation types, and parameter documentation. While comprehensive, every sentence adds value, though the operation type list is lengthy but necessary for completeness.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a mutation tool with no annotations and no output schema, the description provides exceptional completeness. It covers the why (index arithmetic dangers), how (recommended flow), what (operation types), and parameter details. The only minor gap is lack of explicit error handling information, but this is compensated by the thorough behavioral context.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description fully compensates by explaining both parameters in detail. It defines document_id as 'The Google Docs document ID' and provides comprehensive documentation for the operations parameter structure, including the type field with all valid values, address field examples, and params field purpose.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's purpose: 'Make changes to a Google Doc' with specific details about handling index arithmetic and compiling semantic intent into correct request sequences. It distinguishes from sibling tools by mentioning read_document as part of the recommended flow and implicitly contrasting with validate_operations by focusing on execution rather than validation.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides explicit usage guidance: 'call read_document first, then describe your changes using heading names or named ranges as addresses.' It also implicitly advises against manual batchUpdate construction by explaining the risks, effectively stating when not to use alternatives.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
See what the document contains before you edit it.
Returns the document's structural map — headings with hierarchy, named
ranges with boundaries, tables with dimensions, inline objects, and
section boundaries. Without this, you're editing blind: you don't know
what headings exist, where sections start, or what named ranges are
available for targeting.
**Call this before edit_document.** The structural map shows what
addresses are available (heading names, named range names) so your edit
operations target the right locations.
Args:
document_id: The Google Docs document ID (from the URL).
| Name | Required | Description | Default |
|---|---|---|---|
| document_id | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It clearly describes what the tool returns ('structural map — headings with hierarchy, named ranges with boundaries, tables with dimensions, inline objects, and section boundaries') and explains the operational context ('so your edit operations target the right locations'). However, it doesn't mention potential limitations like document size constraints or authentication requirements.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is well-structured and efficiently written. The first sentence states the core purpose, followed by specific details about the return value, then the operational guidance. Every sentence adds value, with no redundant information. The bold text effectively emphasizes the key usage instruction.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a single-parameter tool with no annotations and no output schema, the description provides excellent context about what the tool does, when to use it, and what it returns. However, without an output schema, the description could benefit from more detail about the exact format of the structural map return value, though it does list the key components that will be included.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
With 0% schema description coverage, the description must compensate for the lack of parameter documentation. It provides the single parameter 'document_id' with clear semantics ('The Google Docs document ID from the URL'), which fully covers the one required parameter. The description doesn't need to explain parameter format beyond what's already stated.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's purpose with specific verbs ('see what the document contains', 'returns the document's structural map') and resources ('document', 'headings', 'named ranges', 'tables', 'inline objects', 'section boundaries'). It explicitly distinguishes from the sibling edit_document by explaining this is for viewing structure before editing.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides explicit guidance on when to use this tool: 'Call this before edit_document' and explains why ('Without this, you're editing blind'). It also mentions the alternative edit_document by name and explains the relationship between the tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Check whether edit operations would succeed without executing them.
Returns the compiled batchUpdate requests plus validation status. Use
this when you want to inspect the exact API calls before they execute,
or when debugging why an edit might fail. Catches address resolution
errors, ambiguous headings, out-of-bounds indices, and invalid
operation parameters.
**Use this before edit_document when uncertain.** Shows exactly what
Arezzo would send to the Google Docs API.
Args:
document_id: The Google Docs document ID.
operations: List of operation dicts (same format as edit_document).
| Name | Required | Description | Default |
|---|---|---|---|
| document_id | Yes | ||
| operations | Yes |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden and does well by disclosing key behavioral traits: it's a validation-only tool that doesn't execute changes, returns compiled batchUpdate requests and validation status, and catches specific error types (address resolution errors, ambiguous headings, etc.). It could improve by mentioning rate limits or auth needs, but covers core behavior adequately.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is appropriately sized and front-loaded, with the first sentence stating the core purpose. Every sentence adds value: the second explains returns and use cases, the third details error types, and the fourth provides explicit usage guidance. The Args section efficiently clarifies parameters without redundancy.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given 2 parameters with 0% schema coverage and no output schema, the description does an excellent job explaining inputs and behavior. It falls short of a 5 because it doesn't fully describe the return format (e.g., structure of validation status) or potential error responses, which would be helpful despite no output schema.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 0%, so the description must compensate fully. It adds significant meaning beyond the bare schema by explaining both parameters: 'document_id' is clarified as 'The Google Docs document ID' and 'operations' as 'List of operation dicts (same format as edit_document)', providing crucial context about format and relationship to sibling tools.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the tool's purpose with specific verbs ('check whether edit operations would succeed without executing them') and distinguishes it from siblings by explicitly mentioning 'edit_document' as the alternative for actual execution. It specifies the resource (edit operations on Google Docs) and the unique validation aspect.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description provides explicit guidance on when to use this tool ('when you want to inspect the exact API calls before they execute, or when debugging why an edit might fail') and when not to use it (implied by suggesting use before 'edit_document when uncertain'). It clearly names the alternative sibling tool ('edit_document') for actual execution.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Each tool has a clearly distinct purpose: read_document retrieves structure, edit_document applies changes, and validate_operations validates changes without execution. There is no overlap in functionality, and the descriptions explicitly differentiate their roles in the workflow.
All tool names follow a consistent verb_noun pattern (edit_document, read_document, validate_operations) with clear, descriptive verbs. The naming is uniform and predictable across the set, enhancing usability.
With 3 tools, the server is well-scoped for its purpose of safe Google Docs editing. Each tool earns its place by covering essential steps: reading, validating, and editing, with no redundancy or missing core functions.
The tool set provides complete coverage for the domain of safe document editing: read_document for inspection, edit_document for modifications, and validate_operations for pre-execution checks. There are no gaps, and the tools support a full workflow from start to finish.
Unclaimed servers have limited discoverability.
If you are the server author, to access and configure the admin panel.
Composable APIs for document extraction, image transformation, and document & sheet generation.
Exact text tools for AI agents: unified diff, patch apply, regex testing, grapheme counting.
Markdown in, any format out. PDFs merged, split, watermarked. Runs on our own doc engines.
Real .docx and .xlsx files from structured data, with automatic Hebrew/Arabic RTL.
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