fasta2a_client.py DOX

Purpose

• Own the fasta2a_client.py helper module.
• This module connects Agent Zero to external A2A agents.
• Keep this file-level DOX profile synchronized with fasta2a_client.py because this directory is intentionally flat.

Ownership

• fasta2a_client.py owns the runtime implementation.
• fasta2a_client.py.dox.md owns durable notes about responsibilities, contracts, side effects, and verification for that implementation.
• Classes:
• AgentConnection (no explicit base class)
  • async get_agent_card(self) -> Dict[str, Any]
  • async send_message(self, message: str, attachments: Optional[List[str]]=..., context_id: Optional[str]=..., metadata: Optional[Dict[str, Any]]=...) -> Dict[str, Any]
  • async get_task(self, task_id: str) -> Dict[str, Any]
  • async wait_for_completion(self, task_id: str, poll_interval: int=..., max_wait: int=...) -> Dict[str, Any]
  • async close(self)
• Top-level functions:
• async connect_to_agent(agent_url: str, timeout: int=...) -> AgentConnection: Create a connection to a remote agent.
• is_client_available() -> bool: Check if FastA2A client is available.
• Notable constants/configuration names: _PRINTER.

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 writes, network calls, WebSocket state, settings/state persistence, secret handling, scheduler state.
• Imported dependency areas include: helpers.print_style, typing, uuid.

Key Concepts

• Important called helpers/classes observed in the source: PrintStyle, AgentConnection, PrintStyle.warning, agent_url.rstrip, httpx.AsyncClient, A2AClient, TimeoutError, connection.get_agent_card, RuntimeError, agent_url.startswith, os.getenv, self._http_client.aclose, self.close, response.raise_for_status, response.json, self.get_agent_card, uuid.uuid4, self._a2a_client.send_message, self._a2a_client.get_task, self.get_task.
• 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.
• No direct test reference was found by name search; choose the nearest behavioral test or perform a focused smoke check.

Child DOX Index

No child DOX files.