chat_media.py DOX

Purpose

• Own the chat_media.py helper module.
• This module materializes, stores, and resolves chat-scoped image/media artifacts.
• Keep this file-level DOX profile synchronized with chat_media.py because this directory is intentionally flat.

Ownership

• chat_media.py owns the runtime implementation.
• chat_media.py.dox.md owns durable notes about responsibilities, contracts, side effects, and verification for that implementation.
• Classes:
• ChatImage (no explicit base class)
• Top-level functions:
• screenshot_dir(context_id: str, source: str) -> Path
• artifact_dir(context_id: str, category: ImageCategory=..., source: str=...) -> Path
• save_image_bytes(context_id: str, payload: bytes, mime_type: str=..., category: ImageCategory=..., source: str=..., preferred_name: str=..., max_bytes: int | None=...) -> ChatImage
• save_image_base64(context_id: str, data: str, mime_type: str=..., category: ImageCategory=..., source: str=..., preferred_name: str=..., max_bytes: int | None=...) -> ChatImage
• save_image_file(context_id: str, path: str | Path, category: ImageCategory=..., source: str=..., preferred_name: str=..., max_bytes: int | None=...) -> ChatImage
• save_image_data_url(context_id: str, data_url: str, category: ImageCategory=..., source: str=..., preferred_name: str=..., max_bytes: int | None=...) -> ChatImage
• materialize_image_ref(context_id: str, url: str, source: str=..., preferred_name: str=..., max_bytes: int | None=...) -> str
• is_chat_scoped_path(context_id: str, path: str | Path) -> bool
• infer_source(value: str=..., preferred_name: str=...) -> str
• category_for_source(source: str) -> ImageCategory
• _guess_image_mime(path: Path) -> str
• _is_data_image_url(value: str) -> bool
• _split_image_data_url(data_url: str) -> tuple[str, str]
• Notable constants/configuration names: DEFAULT_MAX_IMAGE_BYTES.

Runtime Contracts

• Helper modules own reusable framework APIs and must preserve public callers unless all callers, tests, and docs are updated together.
• Update this file whenever public functions, classes, persistence behavior, path/security assumptions, side effects, or cross-module contracts change.
• Observed side-effect areas: filesystem reads, filesystem writes, filesystem deletion.
• Imported dependency areas include: __future__, dataclasses, helpers, pathlib, time, typing, uuid.

Key Concepts

• Important called helpers/classes observed in the source: dataclass, artifact_dir, bytes, media_artifacts.normalize_mime, media_artifacts.guess_extension, media_artifacts.safe_filename, Path, time.strftime, path.parent.mkdir, path.write_bytes, ChatImage, media_artifacts.decode_base64_payload, save_image_bytes, image_path.read_bytes, _split_image_data_url, save_image_base64, str.strip, category_for_source, _is_data_image_url, images.resolve_ref.
• Keep request/response, tool, or helper semantics documented here at the same time as source changes.

Work Guidance

• Preserve public helper APIs used by core code and plugins unless every caller is updated.
• Keep path, auth, secret, persistence, network, and subprocess behavior explicit and bounded.
• Prefer adding cohesive helper functions here only when behavior is reused across modules.

Verification

• Run targeted tests for changed helper behavior; run security regressions for auth, filesystem, WebSocket, tunnel, upload, or secret-handling helpers.
• Related tests observed by source search:
  • tests/test_browser_agent_regressions.py
  • tests/test_host_browser_connector.py
  • tests/test_tool_action_contracts.py
  • tests/test_vision_load_image_refs.py

Child DOX Index

No child DOX files.