JuliusBrussee/caveman · error

cursor must be an object

Error message

cursor must be an object

What it means

Error "cursor must be an object" thrown in JuliusBrussee/caveman.

Source

Thrown at packages/cli/src/agent-mcp.ts:529

    if (value !== undefined && typeof value !== "string") throw new Error(`${key} must be a string`);
  }
  optionalEnum(args, "date_field", ["occurred", "updated"]);
  optionalEnum(args, "group_by", ["session", "workflow", "model", "member"]);
  const pageSize = args.page_size;
  if (pageSize !== undefined && (!Number.isSafeInteger(pageSize) || (pageSize as number) < 1 || (pageSize as number) > 500)) {
    throw new Error("page_size must be an integer from 1 to 500");
  }
  const sort = args.sort;
  if (sort !== undefined) {
    if (!sort || typeof sort !== "object" || Array.isArray(sort)) throw new Error("sort must be an object");
    const unknown = Object.keys(sort).filter((key) => key !== "by" && key !== "dir");
    if (unknown.length > 0) throw new Error(`sort has unknown key(s): ${unknown.sort().join(", ")}`);
    optionalEnum(sort, "by", ["timestamp", "total_cost_usd", "latency_ms", "total_tokens"]);
    optionalEnum(sort, "dir", ["asc", "desc"]);
  }
  const cursor = args.cursor;
  if (cursor !== undefined) {
    if (!cursor || typeof cursor !== "object" || Array.isArray(cursor)) throw new Error("cursor must be an object");
    const unknown = Object.keys(cursor).filter((key) => key !== "sort_value" && key !== "request_id" && key !== "group_key");
    if (unknown.length > 0) throw new Error(`cursor has unknown key(s): ${unknown.sort().join(", ")}`);
    if (typeof cursor.sort_value !== "string" || cursor.sort_value === "") throw new Error("cursor.sort_value is required");
    for (const key of ["request_id", "group_key"]) {
      if (cursor[key] !== undefined && typeof cursor[key] !== "string") throw new Error(`cursor.${key} must be a string`);
    }
  }
}

async function callTool(client: AgentMcpClient, name: string, rawArgs: unknown): Promise<ToolResult> {
  const started = Date.now();
  let outcome: "ok" | "error" = "ok";
  try {
    const args = objectArg(rawArgs);
    const allowed = TOOL_ARGUMENT_KEYS[name];
    const unknown = Object.keys(args).filter((key) => !allowed?.has(key));
    if (unknown.length > 0) throw new Error(`unknown argument(s): ${unknown.sort().join(", ")}`);
    let value: JSONValue;

View on GitHub (pinned to 27d5a3981a)

Solutions

1. Pass cursor as an object as returned by a previous page response.

When it happens

Trigger: Thrown at packages/cli/src/agent-mcp.ts:529 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of JuliusBrussee/caveman@27d5a3981a (2026-08-15). Data as JSON: /api/errors/c0f362784990e71e. Report an issue: GitHub.