ic-json-0.1.1 has been yanked.
A minimal JSON reader and writer.
The MCP server speaks JSON-RPC, which means something in this workspace has to parse JSON, not merely emit it. Rather than take a dependency and break the zero-dependency property at the last mile, this is a complete RFC 8259 parser in a few hundred lines, exercised by round-trip and malformed-input tests.
It lived inside the CLI binary until the test-vector harness needed it too. Parsing JSON is not a command-line concern, and a binary crate is a place code goes to become unreachable.