Function parse_agent_response_strict 

pub fn parse_agent_response_strict(
    raw: &str,
) -> Result<AgentResponse, AgentResponseParseError>

Parses one raw assistant message strictly as protocol payload.

The final assistant payload must match AgentResponse and contain at least one recognized protocol key (answer, questions, or summary).

When a provider prepends stray prose before the final schema object, this still recovers the trailing protocol payload as long as nothing except whitespace follows the JSON object. As a further resilience fallback, markdown code fences wrapping the JSON object are stripped before parsing when neither direct parsing nor trailing-object recovery succeeds. An additional fallback extracts JSON from an embedded code fence preceded by prose text (e.g., commentary followed by a fenced JSON block). Top-level fields may rely on the wire type’s defaults.

Errors

Returns AgentResponseParseError when no valid protocol payload is found.