AWS MCP Server

Instructions

Implementation Reference

• index.ts:81-89 (registration)

  Registers the 'list-credentials' tool in the listTools response with an empty input schema.

    name: "list-credentials",
    description:
      "List all AWS credentials/configs/profiles that are configured/usable on this machine",
    inputSchema: {
      type: "object",
      properties: {},
      required: [],
    },
  },

• index.ts:164-167 (handler)

  Executes the 'list-credentials' tool by serializing and returning the list of available AWS profile names along with any error from loading credentials.

  } else if (name === "list-credentials") {
    return createTextResponse(
      JSON.stringify({ profiles: Object.keys(profiles), error })
    );

• index.ts:214-232 (helper)

  Core helper function that loads AWS credentials and configuration files using AWS.IniLoader, merges them into a profiles object, and handles errors.

  async function listCredentials() {
    let credentials: any;
    let configs: any;
    let error: any;
    try {
      credentials = new AWS.IniLoader().loadFrom({});
    } catch (error) {
      error = `Failed to load credentials: ${error}`;
    }
    try {
      configs = new AWS.IniLoader().loadFrom({ isConfig: true });
    } catch (error) {
      error = `Failed to load configs: ${error}`;
    }
  
    const profiles = { ...(credentials || {}), ...(configs || {}) };
  
    return { profiles, error };
  }