schema-org-mcp
MCP server enabling AI assistants to explore schema.org types, generate JSON-LD examples, validate structured data, and navigate the complete ontology with fuzzy matching and caching.
Caution. Specific findings reduced this grade. They are listed on the page. Grades reflect the full trust pyramid: code, verification depth, and reputation. New projects cap at C until adoption is earned.
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The grade above is for the source repository. Registries can serve a different version, so we mark the ones we were not able to read.
These names and descriptions are the publisher's own, read from the source code. We print them as written. Our assessment is the findings above, not this list.
server_infoGet server version, build info, and runtime fingerprint. Use this to verify which version is deployed.
server_statsGet server performance statistics including cache hit rates, tool invocation counts, and timing.
get_schema_typeGet detailed information about a schema.org type including description, parent types, and documentation URL
search_schemasSearch for schema.org types by keyword. Searches type names and descriptions.
get_type_hierarchyGet the inheritance hierarchy for a schema.org type, showing parent types and child types
get_type_propertiesGet all properties available for a schema.org type, with expected value types. Supports filtering by mode, pagination, and deprecation status.
generate_exampleGenerate a comprehensive JSON-LD example for a schema.org type with realistic sample data
get_property_detailsGet detailed information about a specific schema.org property
get_enumeration_valuesGet all valid values for a schema.org enumeration type (e.g., DayOfWeek, EventStatusType)
validate_jsonldValidate a JSON-LD object against schema.org vocabulary. Checks types, properties, and expected value types.
get_related_typesFind types related to a given type through properties (types that can be values of its properties, or types that have properties pointing to it)
get_multiple_typesGet information about multiple schema.org types in a single call. Useful for comparison or bulk lookups.
compare_typesCompare 2-5 schema.org types side by side. Shows shared properties, unique properties, and recommendations for when to use each.
validate_jsonld_batchValidate multiple JSON-LD objects in a single call. Returns validation results for each object.
Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Anthropic's MCP TypeScript SDK has a ReDoS vulnerability
Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
axios Vulnerable to Full Man-in-the-Middle via Prototype Pollution Gadget in `config.proxy`
axios Vulnerable to Credential Theft and Response Hijacking via Prototype Pollution Gadget in Config Merge
Tool annotations
No tools have read-only/destructive annotations
Add readOnlyHint or destructiveHint annotations to every tool so hosts can warn users before invoking.
All four hints declared on every tool
14/14 tools missing one or more hints — server_info (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); server_stats (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_schema_type (missing: readOnlyHint, destructiveHint, idempotentHint, openWorldHint), +11 more. OpenAI's directory rejects tools where any of the four hints are missing or non-boolean.
For every tool, set all four hints (readOnlyHint, destructiveHint, idempotentHint, openWorldHint) to explicit true/false values that match the handler’s actual behaviour.
Tool inputs are validated
12/14 tool handlers declare input schemas (86%)
Declare an inputSchema with zod/joi/yup on every tool definition.
Tool handlers catch errors
Only 0/14 tool handlers wrap calls in try/catch (0%)
Wrap each tool handler body in try/catch and return a structured error response.
Tool test coverage
Only 0/14 tools referenced in tests (0%)
Write tests that reference each tool by name so every tool has at least one test.
Production dependencies are patched
0 critical, 17 high severity in production deps — @modelcontextprotocol/sdk@1.12.0 (high), @modelcontextprotocol/sdk@1.12.0 (high)
Run npm audit fix, or upgrade the affected packages to a non-vulnerable version.
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