# GraphQL Schema Explorer - Human page: https://happytails.ai/en/developer-tools/graphql-schema-explorer/ - Markdown: https://happytails.ai/en/developer-tools/graphql-schema-explorer.md - Structured JSON: https://happytails.ai/agents/en/developer-tools/graphql-schema-explorer/index.json - Visibility: public ## Tool capabilities | Property | Value | | --- | --- | | Tool ID | `graphql-schema-explorer` | | Category | developer-tools | | Implementation | Registered implementation. Registration alone is not a production-quality guarantee. | | Browser execution | Use the visible action or interactive controls. | | Browser processing | Browser; see tool notes for network behavior. | | HTTP API | Not callable through HTTP. | | Browser-agent interface | run_current_tool | ### Implementation notes Runs in your browser in a background worker. Accepts up to 1000000 characters of SDL or introspection JSON and never contacts a GraphQL server. ### Inputs and settings Text input: GraphQL schema. Example or placeholder shown in the interface (not a validated fixture): ```text type Query { book(id: ID!): Book } ``` SDL text, or introspection JSON with a __schema object. Up to 1,000,000 characters. Review the settings before running. | Setting | Meaning | Control type | Default | Constraints | | --- | --- | --- | --- | --- | | `search` | Search, optional | text | "" | | | `kind` | Type kind | select | "all" | Allowed: all, OBJECT, INTERFACE, UNION, ENUM, INPUT_OBJECT, SCALAR | ### Browser-agent workflow 1. Open the human page in a browser that supports WebMCP. 2. Discover the interface exposed by that page; use its actual schema. 3. Select files on the page first when the tool requires files. 4. Call `run_current_tool` with valid input and settings. 5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links. Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution. ### Planning specification Accepts up to 1,000,000 characters of SDL or introspection JSON, at most 100,000 tokens or 50,000 JSON values and 10,000 types, with a search of up to 200 characters. Very large schemas whose report would pass 4,000,000 characters are rejected. Everything runs in your browser in a background worker. Downloads are a JSON report and a Markdown reference. This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support. ### Complete machine-readable capability record ```json { "id": "graphql-schema-explorer", "category": "developer-tools", "built": true, "requirements": "Accepts up to 1,000,000 characters of SDL or introspection JSON, at most 100,000 tokens or 50,000 JSON values and 10,000 types, with a search of up to 200 characters. Very large schemas whose report would pass 4,000,000 characters are rejected. Everything runs in your browser in a background worker. Downloads are a JSON report and a Markdown reference.", "implementation": { "fields": [ { "key": "search", "label": "Search, optional", "value": "", "type": "text", "maxLength": 200, "help": "Keeps types whose name, field names or enum values contain this text, ignoring case." }, { "key": "kind", "label": "Type kind", "value": "all", "type": "select", "values": [ "all", "OBJECT", "INTERFACE", "UNION", "ENUM", "INPUT_OBJECT", "SCALAR" ] } ], "registrationFamily": "api-contracts-schemas", "codeDirection": "ltr", "presentation": "metrics", "inputMaxLength": 1000000, "inputErrorCode": "API_CONTRACTS_SCHEMAS_TOO_LONG_GRAPHQL_SCHEMA_EXPLORER", "note": "Runs in your browser in a background worker. Accepts up to 1000000 characters of SDL or introspection JSON and never contacts a GraphQL server.", "experience": { "automatic": false, "single": false, "inputMaxLength": 1000000, "inputMode": "text", "label": "GraphQL schema", "placeholder": "type Query { book(id: ID!): Book }", "help": "SDL text, or introspection JSON with a __schema object. Up to 1,000,000 characters. Review the settings before running.", "helpParts": [ "SDL text, or introspection JSON with a __schema object.", "Up to 1,000,000 characters.", "Review the settings before running." ], "action": null }, "mode": "explicit", "interactive": false }, "execution": "Browser interface", "api": null, "browser_agent": { "supported": true, "name": "run_current_tool", "discovery": "WebMCP on the human page in a supporting browser", "verification": "See audit/API-AUDIT.md; availability is not verification" } } ``` ## Page guide Browse matching GraphQL types in the page, then open the details table to inspect fields, arguments and relationships. Paste SDL or introspection JSON and search by name or kind. ### How to use GraphQL Schema Explorer 1. Paste the schema as SDL or introspection JSON. 2. Optionally enter search text or choose one type kind. 3. Run the explorer. Browse matching types, then open Fields and relationships to search the full member list. 4. Download the complete JSON report or Markdown reference for the current filters. How can we improve this tool? Report a problem or share an idea. Please leave out private information. Your message and the tool name go to our team via PostHog. ## Useful next steps - [GraphQL Query Validator](https://happytails.ai/en/developer-tools/graphql-query-validator/) ([Markdown](https://happytails.ai/en/developer-tools/graphql-query-validator.md)) - [GraphQL Query Cost Estimator](https://happytails.ai/en/developer-tools/graphql-query-cost-estimator/) ([Markdown](https://happytails.ai/en/developer-tools/graphql-query-cost-estimator.md)) - [JSON formatter](https://happytails.ai/en/developer-tools/json-formatter/) ([Markdown](https://happytails.ai/en/developer-tools/json-formatter.md)) Accepts up to 1,000,000 characters of SDL or introspection JSON, at most 100,000 tokens or 50,000 JSON values and 10,000 types, with a search of up to 200 characters. Very large schemas whose report would pass 4,000,000 characters are rejected. Everything runs in your browser in a background worker. Downloads are a JSON report and a Markdown reference. ## What you see Matching types appear by name and kind in the page. Open Fields and relationships to inspect their fields and arguments, input fields, enum values, implemented interfaces, implementers, union members and referring fields. Search the details table or move between its pages for larger schemas. The JSON and Markdown downloads retain all details for the current filters, including descriptions and deprecation reasons. Built-in scalars and directives are left out. ### Search and filters Search keeps types whose name, field names, input field names or enum values contain your text, ignoring case. The kind filter keeps only objects, interfaces, unions, enums, input objects or scalars. Counts for the whole schema stay in the report. ### Problems in the schema The explorer still loads a schema that has mistakes, such as a field type that is not defined, a duplicate field or a type that misses an interface field, and lists them as problems to review. Schema extensions are merged into their types.