[lxcxjxhx]

Three docstrings in src/google/adk/tools/ do not match their functions:

Function	Problem	Fix
ApplicationIntegrationToolset.__init__	the docstring opens with """Args: and then repeats Args: on the next paragraph	first one becomes a one-line summary, real block untouched
OAuth2CredentialExchanger.generate_auth_token	documents auth_scheme	the scheme is a constructor parameter; the argument is only auth_credential
RestApiTool.from_parsed_operation_str	documents parsed: A dict representation of a ParsedOperation object	the parameter is parsed_operation_str: str, and the body calls ParsedOperation.model_validate_json(...) on it

The third one is the one that would actually mislead: the type is wrong (dict vs str) as well as the name, so a reader passing a dict gets a validation error from model_validate_json.

Verification

• AST comparison against the previous head with docstrings excluded: identical for all three files.
• ruff check on the three files: All checks passed! before and after.
• No test covers docstring text; the change is text only.

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