Module helpers 

MCP helper functions — error and result formatting.

Functions

json_result

Wrap a JSON value into a successful MCP call result.

mcp_err

Convert a crate Error into an MCP protocol error with structured data.

run_json

Run a permission check (or .and(...)-chained checks), then a future, and wrap the JSON result. Errors are surfaced as a CallToolResult with is_error: true (per MCP spec) rather than as a transport-level McpError, so an AI agent client can recover without aborting its loop.

run_text

Like run_json but wraps a plain text result.

text_result

Wrap a plain text string into a successful MCP call result.