[utkarsh5026]

Step 3 of the code style work, for agent/ (after #90 and #91).

What changed

Comments. All 133 # comments in agent/ are gone. Each one's content now lives in a docstring (Budget's fields, AgentAnswer's, Toolkit's attributes, what READ_PREFIXES and _SECRETS cover) or in a name (_OVERTIME_SECONDS, _NEAR_TIMEOUT, _SIZE_WORKERS, _checked_zone, ...).

Tools are methods. Each toolkit's tools() used to define seven nested functions in one 150-line body. Now each tool is a method, and tools() just lists them:

def tools(self):
    return [self.find_functions, self.function_health, self.function_errors, ...]

A tool's docstring is what the model reads, so internal notes that were comments inside bucket_details and find_files didn't go into those docstrings. They moved to small helpers with docstrings of their own: _require_bucket, _account_block and _matching.

Long functions split into steps:

Before	After
S3Toolkit._triggers: complexity 30, 110 lines	s3_triggers built on _pairs_in_bucket / _pairs_for_function; a _LinkChecker dataclass that reads each function, policy and listing once; plus _triggers_summary and _triggers_next
trigger_findings: complexity 13	_not_allowed and _arrival_findings, which is built from _missed_by_upload_kind, _missed_by_case, _nothing_arrived and _runs_against_arrivals
count_arrivals: complexity 11	_count_covered for each file the filter covers
runtime.as_tool: complexity 11	_asked_for, _failed / _aws_error and _reported
harness.stream_turn: complexity 12	_model_messages, _count_usage and _stop_reason
summarize_health: complexity 11	_health_groups

Rule exceptions. Intentional broad excepts carry # noqa: BLE001: a tool never raises into the agent loop, and a model error becomes answer.error. Public functions whose parameters really belong to them, and the tools the model calls, carry # noqa: PLR0913.

agent/ comes off ruff.toml's per-file-ignores and tests/test_style.py's COMMENTS_LEFT.

Nothing the model or a user sees changed

• Tool schemas: each tool's name, description and argument schema, as LangChain builds them, is byte-for-byte identical to main before Code style: docstrings on their own lines, and checks that keep the rules #90, checked for all 14 tools on Python 3.13 with the real langchain_core. That check also covers Code style: docstrings on their own lines, and checks that keep the rules #90's docstring reshape: LangChain strips the new leading newline.
• Tests on 3.13: the full suite passes, 1,180 tests, with nothing skipped. That includes the agent-loop tests that skip on 3.10 (the scripted model, and AzureChatOpenAI over a mock transport).
• CI on 3.10: check/run.py passes: ruff, imports, package, rules (0 errors), and pytest with 1,164 passed and 16 skipped.
• Reports: snapshot.py compare shows 319 of 321 outputs identical. The other two are the known traceback line numbers from Code style: docstrings on their own lines, and checks that keep the rules #90. The "lost" names are the two private methods s3_triggers replaced: S3Toolkit._triggers and _triggers_tool.

No CHANGELOG entry: nothing a user sees changes.

🤖 Generated with Claude Code