aa9b16995e
schemars derives an empty (no-type) JSON Schema for Option<serde_json::Value>
and serde_json::Value fields. Claude Code's MCP client interprets schema-
without-type as 'string-encoded' and JSON-stringifies the user's {...}
before sending — at which point the server-side validation
`value.is_object()` returns false and the tool errors with
'CIP-25 metadata must be a JSON object' / 'CIP-68 metadata must be a
JSON object'.
Surfaced during Track #37 E2E test (2026-05-09): wallet_mint and
wallet_mint_cip68_nft both rejected metadata-as-object args from
Claude Code while the SAME object via raw stdio MCP works fine —
proves the issue is client-side schema interpretation, not server.
Fix: add a json_object_schema helper that emits {type: object,
additionalProperties: true} and annotate every metadata + policy
field with #[schemars(schema_with = "json_object_schema")].
Affected fields:
- MintArgs.metadata
- MintUnsignedArgs.policy + .metadata
- Cip68NftArgs.metadata
additionalProperties is left wide-open since these args really do
accept arbitrary keys (CIP-25/CIP-68 are open-ended schemas).
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