Function format_rows_response

src/environmentd/src/http/mcp.rs:973–996

Serialize rows to JSON and enforce the response size cap. If the serialized response exceeds `max_size` bytes, returns an error telling the agent to narrow its query. This mirrors how the HTTP SQL endpoint handles `max_result_size` in sql.rs — fail cleanly rather than silently truncating.

(
    rows: Vec<Vec<serde_json::Value>>,
    max_size: usize,
)

/// endpoint handles `max_result_size` in sql.rs — fail cleanly rather
/// than silently truncating.
fn format_rows_response(
    rows: Vec<Vec<serde_json::Value>>,
    max_size: usize,
) -> Result<McpResult, McpRequestError> {
    let text =
        serde_json::to_string_pretty(&rows).map_err(|e| McpRequestError::Internal(anyhow!(e)))?;

    if text.len() > max_size {
        return Err(McpRequestError::QueryExecutionFailed(format!(
            "Response size ({} bytes) exceeds the {} byte limit. \
             Use LIMIT or WHERE to narrow your query.",
            text.len(),
            max_size,
        )));
    }

    Ok(McpResult::ToolContent(ToolContentResult {
        content: vec![ContentBlock {
            content_type: "text".to_string(),
            text,
        }],
        is_error: false,
    }))
}

async fn get_data_products(
    client: &mut AuthedClient,