Built-in tools

This document records the mapping of provider built-in tools to the tools of GigaChat Chat Completions v2. The source of truth for GigaChat here is the installed gigachat SDK, not the website or external documentation.

Source of truth

In pyproject.toml the package requires gigachat>=0.2.4a1,<0.3.0. For this range, the canonical list of built-in tools comes from the SDK models:

• gigachat.models.chat_completions.ChatTool;
• the SDK shorthand normalizer _normalize_tool;
• the local helper object gpt2giga.common.tools.GIGACHAT_BUILTIN_TOOL_TYPES.

The SDK accepts exactly these built-in tool fields:

GigaChat tool	SDK field	Configuration shape
Web search	web_search	ChatWebSearchTool: type, indexes, flags plus SDK-compatible extra fields
URL content extraction	url_content_extraction	dict[str, Any]
Code interpreter	code_interpreter	dict[str, Any]
Image generation	image_generate	dict[str, Any]
3D model generation	model_3d_generate	dict[str, Any]

functions in ChatTool is a wrapper for user function tools. It is not a GigaChat built-in tool: it is mapped separately from OpenAI/Anthropic/Gemini function declarations.

Where tools are executed

Built-in tools are sent upstream only through the GigaChat Chat Completions v2 contract. On public routes this means:

• /v2/... always uses the v2 backend contract;
• root routes use v2 only with GPT2GIGA_GIGACHAT_API_MODE=v2;
• /v1/... uses the legacy GigaChat chat contract, where built-in tools are not passed as executable tools.

If the same built-in tool is passed several times in one request through different aliases, the first canonical field reaches the GigaChat payload. A forced tool_choice for supported built-in tools turns into a GigaChat ChatToolConfig(mode="tool", tool_name="<canonical tool>").

OpenAI mapping

OpenAI Chat Completions and Responses tools are normalized by type.

OpenAI tool type	GigaChat tool	Notes
web_search	web_search	Direct canonical mapping
web_search_*	web_search	Covers dated OpenAI types, for example web_search_2025_08_26
web_search_preview	web_search	Preview alias
web_search_preview_*	web_search	Dated preview aliases
code_interpreter	code_interpreter	Direct canonical mapping
image_generation	image_generate	Alias for OpenAI Responses image generation
image_generate	image_generate	Canonical GigaChat passthrough without renaming
url_content_extraction	url_content_extraction	Canonical GigaChat passthrough without renaming
model_3d_generate	model_3d_generate	Native GigaChat passthrough without renaming
function	functions wrapper	A user function, not a built-in tool
namespace	functions wrapper	Responses namespace tools are flattened into GigaChat function names

When a Responses client advertises the Codex ImageGen tool as a flat imagegen / image_gen__imagegen function or as image_gen.imagegen inside a namespace, a provider-side image_generate hand-off is returned as a function call to that exact client tool. Requests that advertise the native image_generation built-in keep the normal image_generation_call response.

The configuration is read from the canonical field, the alias field, and non-structured top-level keys. For example:

{
  "type": "web_search_preview",
  "indexes": ["web"],
  "flags": ["trusted"]
}

turns into:

{"web_search": {"indexes": ["web"], "flags": ["trusted"]}}

Anthropic mapping

Anthropic Messages tools use versioned provider tool names. The proxy strips provider/version suffixes where the meaning maps cleanly to a GigaChat SDK built-in tool.

Anthropic tool type	GigaChat tool	Notes
web_search	web_search	Direct provider alias
web_search_*	web_search	Covers dated SDK names, for example web_search_20250305
web_fetch	url_content_extraction	URL fetch maps to URL content extraction
web_fetch_*	url_content_extraction	Covers dated SDK names, for example web_fetch_20250910
code_execution	code_interpreter	Code execution maps to the interpreter
code_execution_*	code_interpreter	Covers dated SDK names, for example code_execution_20250825
Custom tools with input_schema	functions wrapper	A user function, not a built-in tool

Gemini mapping

Gemini tools entries do not contain a type field. The adapter maps known tool-object keys to GigaChat built-in tools, and keeps unsupported keys in raw_extensions["unsupportedTools"] for diagnostics.

Gemini tool key	GigaChat tool	Notes
googleSearch / google_search	web_search	Google search maps to web search
googleSearchRetrieval / google_search_retrieval	web_search	The legacy/retrieval search form is best-effort mapped to web search
urlContext / url_context	url_content_extraction	URL context maps to URL content extraction
codeExecution / code_execution	code_interpreter	Code execution maps to the interpreter
functionDeclarations / function_declarations	functions wrapper	User functions, not built-in tools

For Gemini requests, only the configuration object from a supported Gemini tool key is passed into the canonical GigaChat field:

{"googleSearch": {"indexes": ["web"]}}

turns into:

{"type": "web_search", "web_search": {"indexes": ["web"]}}

toolConfig.functionCallingConfig applies only to Gemini function declarations. It does not force, filter, or remove provider built-in tools.

Not mapped

Provider built-in tools remain unsupported if the GigaChat SDK does not provide a semantically equivalent ChatTool field.

Provider	Examples without a mapping	Behavior
OpenAI	file_search, computer, computer_use_preview, mcp, tool_search, shell, local_shell, apply_patch, freeform custom	Ignored or kept only in compatibility diagnostics depending on the route
Anthropic	tool_search*, memory*, bash*, text_editor*, advisor, MCP tools, computer-use tools	Accepted where allowed by the compatibility policy, but not sent to GigaChat as executable built-in tools
Gemini	fileSearch, googleMaps, computerUse, mcpServers, enterpriseWebSearch, parallelAiSearch, Vertex/RAG/retrieval tools	Kept in the unsupportedTools diagnostics and not applied by GigaChat

This approach is intentionally conservative: similar names are not enough for a mapping. A mapping appears only when the GigaChat SDK has an executable field with the same operational meaning.

Update checklist

When a provider SDK adds or renames built-in tools:

1. Check the installed provider SDKs and the GigaChat SDK models.
2. Update gpt2giga.common.tools.normalize_gigachat_builtin_tool_type.
3. For Gemini object-key tools, update gpt2giga.protocols.gemini.adapter.
4. Add request-builder and adapter tests.
5. Update this document, as well as api-compatibility.md and client-parameter-compatibility.md, if the public behavior changes.