run_graphql_mutation
Execute GraphQL mutations to insert, update, or delete data on Hasura GraphQL endpoints. Define the mutation string and optional variables for precise data manipulation.
Instructions
Executes a GraphQL mutation to insert, update, or delete data...
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| mutation | Yes | The GraphQL mutation string. | |
| variables | No | Optional. An object containing variables... |
Implementation Reference
- src/index.ts:145-165 (registration)Registration of the 'run_graphql_mutation' tool with the MCP server, specifying name, description, input schema using Zod, and the handler function.
server.tool( "run_graphql_mutation", "Executes a GraphQL mutation to insert, update, or delete data...", { mutation: z.string().describe("The GraphQL mutation string."), variables: z.record(z.unknown()).optional().describe("Optional. An object containing variables..."), }, async ({ mutation, variables }) => { console.log(`[INFO] Executing tool 'run_graphql_mutation'`); if (!mutation.trim().toLowerCase().startsWith('mutation')) { throw new Error("The provided string does not appear to be a mutation..."); } try { const result = await makeGqlRequest(mutation, variables); return { content: [{ type: "text", text: JSON.stringify(result, null, 2) }] }; } catch (error: any) { console.error(`[ERROR] Tool 'run_graphql_mutation' failed: ${error.message}`); throw error; } } ); - src/index.ts:152-164 (handler)The core handler function that validates the mutation query, executes it via makeGqlRequest helper, returns formatted JSON result as MCP content, and propagates errors.
async ({ mutation, variables }) => { console.log(`[INFO] Executing tool 'run_graphql_mutation'`); if (!mutation.trim().toLowerCase().startsWith('mutation')) { throw new Error("The provided string does not appear to be a mutation..."); } try { const result = await makeGqlRequest(mutation, variables); return { content: [{ type: "text", text: JSON.stringify(result, null, 2) }] }; } catch (error: any) { console.error(`[ERROR] Tool 'run_graphql_mutation' failed: ${error.message}`); throw error; } } - src/index.ts:148-151 (schema)Input schema using Zod: required 'mutation' string parameter and optional 'variables' object for GraphQL variables.
{ mutation: z.string().describe("The GraphQL mutation string."), variables: z.record(z.unknown()).optional().describe("Optional. An object containing variables..."), }, - src/index.ts:54-74 (helper)Helper function to execute GraphQL requests with the configured gqlClient, merging headers, handling variables, and providing detailed error messages for GraphQL and client errors.
async function makeGqlRequest< T = any, V extends Record<string, any> = Record<string, any> >( query: string, variables?: V, requestHeaders?: Record<string, string> ): Promise<T> { try { const combinedHeaders = { ...headers, ...requestHeaders }; return await gqlClient.request<T>(query, variables, combinedHeaders); } catch (error) { if (error instanceof ClientError) { const gqlErrors = error.response?.errors?.map(e => e.message).join(', ') || 'Unknown GraphQL error'; console.error(`[ERROR] GraphQL Request Failed: ${gqlErrors}`, error.response); throw new Error(`GraphQL operation failed: ${gqlErrors}`); } console.error("[ERROR] Unexpected error during GraphQL request:", error); throw error; } }