Economic Data Changes

Instructions

Implementation Reference

• src/tools/econ.ts:215-264 (registration)

  The 'registerEconTools' function is called from src/index.ts, and within it, server.registerTool('econ_changes', ...) registers the tool. The handler, schema, and registration are all in one block.

  // ── Change feed ───────────────────────────────────────────────────────
  
  server.registerTool(
    "econ_changes",
    {
      title: "Economic Data Changes",
      description:
        "Get recent changes to economic data since a given timestamp. " +
        "Cost: $0.005 per query. Source: FRED, BLS, BEA.",
      inputSchema: {
        since: z
          .string()
          .describe("ISO 8601 timestamp to get changes since (e.g. 2026-03-01T00:00:00Z)"),
        limit: z
          .number()
          .int()
          .min(1)
          .max(100)
          .optional()
          .describe("Maximum results (default 50)"),
      },
    },
    async ({ since, limit }) => {
      const res = await apiGet<EconQueryResponse>("/api/v1/econ/changes", {
        since,
        limit: limit ?? 50,
      });
  
      if (!res.ok) {
        return {
          content: [
            {
              type: "text" as const,
              text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
            },
          ],
          isError: true,
        };
      }
  
      const { count, data } = res.data;
      const warn = stalenessWarning(res);
      const summary = `${warn}Found ${count} economic data change(s) since ${since}.`;
      const json = JSON.stringify(data, null, 2);
  
      return {
        content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
      };
    },
  );

• src/tools/econ.ts:219-236 (schema)

  Input schema definition for the econ_changes tool, defining 'since' (required ISO 8601 string) and 'limit' (optional int, 1-100, default 50) parameters.

  {
    title: "Economic Data Changes",
    description:
      "Get recent changes to economic data since a given timestamp. " +
      "Cost: $0.005 per query. Source: FRED, BLS, BEA.",
    inputSchema: {
      since: z
        .string()
        .describe("ISO 8601 timestamp to get changes since (e.g. 2026-03-01T00:00:00Z)"),
      limit: z
        .number()
        .int()
        .min(1)
        .max(100)
        .optional()
        .describe("Maximum results (default 50)"),
    },
  },

• src/tools/econ.ts:237-263 (handler)

  The async handler function for econ_changes. It calls apiGet to "/api/v1/econ/changes" with 'since' and 'limit' params, handles errors, and returns the data as text content.

  async ({ since, limit }) => {
    const res = await apiGet<EconQueryResponse>("/api/v1/econ/changes", {
      since,
      limit: limit ?? 50,
    });
  
    if (!res.ok) {
      return {
        content: [
          {
            type: "text" as const,
            text: `API error (${res.status}): ${JSON.stringify(res.data)}`,
          },
        ],
        isError: true,
      };
    }
  
    const { count, data } = res.data;
    const warn = stalenessWarning(res);
    const summary = `${warn}Found ${count} economic data change(s) since ${since}.`;
    const json = JSON.stringify(data, null, 2);
  
    return {
      content: [{ type: "text" as const, text: `${summary}\n\n${json}` }],
    };
  },

• src/index.ts:57-57 (registration)

  Registration call: registerEconTools(server) is invoked in the createMcpServer() function, registering all econ tools including econ_changes on the MCP server.

  registerEconTools(server);