OpenFeature MCP Server

Instructions

Implementation Reference

• src/tools/installTools.ts:121-144 (handler)

  The main handler function for the 'install_openfeature_sdk' tool. Parses args, fetches bundled prompt for the specified technology, builds provider prompts if any, processes the final text, logs it, and returns text content with provider resource links.
  async (args: unknown): Promise<CallToolResult> => { const { technology, providers } = InstallTechnologyArgsSchema.parse(args); const prompt: string = BUNDLED_PROMPTS[technology]; const providerPrompts = buildProviderPrompts(providers, technology); const finalText = processPromptWithProviders( prompt, providers, technology, providerPrompts ); console.error(`install_openfeature_sdk prompt text: \n${finalText}`); return { content: [ { type: "text" as const, text: finalText, }, // Include resource links for any available provider docs so clients can read them directly ...buildProviderResourceLinks(providers, technology), ], }; }
• src/tools/installTools.ts:106-145 (registration)

  The registration of the 'install_openfeature_sdk' tool within the registerInstallTools function, including name, description, annotations, inputSchema, and inline handler.
  registerToolWithErrorHandling( "install_openfeature_sdk", { description: [ "Fetch OpenFeature SDK installation instructions, and follow the instructions to install the OpenFeature SDK.", "If you are installing a provider, also fetches the provider installation instructions.", "Also includes documentation and examples for using OpenFeature SDK in your application.", "Choose the technology that matches the application's language/framework.", ].join(" "), annotations: { title: "Install OpenFeature SDK", readOnlyHint: true, }, inputSchema: InstallTechnologyArgsSchema.shape, }, async (args: unknown): Promise<CallToolResult> => { const { technology, providers } = InstallTechnologyArgsSchema.parse(args); const prompt: string = BUNDLED_PROMPTS[technology]; const providerPrompts = buildProviderPrompts(providers, technology); const finalText = processPromptWithProviders( prompt, providers, technology, providerPrompts ); console.error(`install_openfeature_sdk prompt text: \n${finalText}`); return { content: [ { type: "text" as const, text: finalText, }, // Include resource links for any available provider docs so clients can read them directly ...buildProviderResourceLinks(providers, technology), ], }; } );
• src/tools/installTools.ts:16-19 (schema)

  Zod schema defining the input for the tool: technology (from InstallTechnologySchema) and optional providers array.
  const InstallTechnologyArgsSchema = z.object({ technology: InstallTechnologySchema, providers: providersSchema.optional().default([]), });
• src/tools/installTools.ts:21-63 (helper)

  Helper function that generates provider-specific installation prompt strings based on available documentation links.
  function buildProviderPrompts( providers: ProviderName[], technology: z.infer<typeof InstallTechnologySchema> ): string[] { const providerPrompts: string[] = []; for (const providerName of providers) { const providerDocLinks = PROVIDER_DOCS[providerName]; if (!providerDocLinks) { throw new Error( `Provider '${providerName}' is not recognized. Available providers: ${Object.keys( PROVIDER_DOCS ).join(", ")}` ); } console.error(`providerDocLinks: ${providerDocLinks}`); console.error(`technology: ${technology}`); const perTechnologyUrl = providerDocLinks[technology] || ""; if (perTechnologyUrl) { if (!DISABLE_RESOURCES) { const resourceName = `of-provider-doc:${providerName}:${technology}`; providerPrompts.push( `- **${providerName}**: If your AI Agent supports MCP resources, fetch the MCP resource named \`${resourceName}\` ` + `(otherwise read the documentation from this link: ${perTechnologyUrl}) ` + `and evaluate the best way to install and configure this provider alongside the OpenFeature ${technology} SDK.` ); } else { providerPrompts.push( `- **${providerName}**: Read the provider documentation from this link: ${perTechnologyUrl} ` + `and evaluate the best way to install and configure this provider alongside the OpenFeature ${technology} SDK.` ); } } else { providerPrompts.push( `- **${providerName}**: No specific ${technology} documentation URL found. Search for "${providerName} OpenFeature ${technology}" ` + `installation documentation and provide installation instructions if available.` ); } } return providerPrompts; }
• src/tools/installTools.ts:65-101 (helper)

  Helper function that processes the base prompt by injecting or appending provider instructions, handling markers or fallback appendix.
  function processPromptWithProviders( prompt: string, providers: ProviderName[], technology: z.infer<typeof InstallTechnologySchema>, providerPrompts: string[] ): string { // Marker-based injection: replace the block between markers when providers are specified const providersMarkerPattern = /<!--\s*PROVIDERS:START\s*-->[\s\S]*?<!--\s*PROVIDERS:END\s*-->/; const providerBlock = providerPrompts.length ? ["### Step 2: Provider installation", "", ...providerPrompts].join("\n") : ""; const providersAppendix = providerPrompts.length ? `\n\n---\n\nProvider installation instructions for ${technology}:\n\n${providerPrompts.join( "\n" )}` : ""; let finalText = prompt; if (providers.length > 0) { if (providersMarkerPattern.test(prompt)) { // Replace the marker block with provider content (without the markers) finalText = prompt.replace(providersMarkerPattern, providerBlock); } else { // Fallback: append to the end if no marker exists in the prompt finalText = `${prompt}${providersAppendix}`; } } else { // No providers specified: strip the marker block entirely finalText = prompt.replace(providersMarkerPattern, ""); } return finalText; }