{"record":{"id":"42d4c22921a5959e","repo":"rohitg00/ai-engineering-from-scratch","slug":"tools-list-page-limit-must-be-a-positive-integer","errorCode":null,"errorMessage":"tools/list page limit must be a positive integer","messagePattern":"tools/list page limit must be a positive integer","errorType":"validation","errorClass":"ContractViolation","httpStatus":null,"severity":"error","filePath":"phases/13-tools-and-protocols/28-mcp-tool-contracts-and-content/code/main.py","lineNumber":680,"sourceCode":"                        \"error\": {\n                            \"code\": -32020,\n                            \"message\": \"parameter headers do not match request body\",\n                            \"data\": {\"reason\": str(exc)},\n                        },\n                    }\n    return 200, server.dispatch(request, principal=principal)\n\n\nclass ContractClient:\n    def __init__(\n        self,\n        server: ContractServer,\n        *,\n        principal: str = \"analyst\",\n        max_list_pages: int = MAX_TOOL_LIST_PAGES,\n    ) -> None:\n        if type(max_list_pages) is not int or max_list_pages <= 0:\n            raise ContractViolation(\"tools/list page limit must be a positive integer\")\n        self.server = server\n        self.principal = principal\n        self.max_list_pages = max_list_pages\n        self.rejections: list[dict[str, str]] = []\n        self.cursor_trace: list[str | None] = []\n        self.tools: dict[str, dict[str, Any]] = {}\n\n    def discover_tools(self) -> dict[str, dict[str, Any]]:\n        cursor: str | None = None\n        request_id = 1\n        seen_cursors: set[str] = set()\n        for _ in range(self.max_list_pages):\n            params: dict[str, Any] = {}\n            if cursor is not None:\n                params[\"cursor\"] = cursor\n            self.cursor_trace.append(cursor)\n            response = self.server.dispatch(make_request(request_id, \"tools/list\", params))\n            if response is None or \"error\" in response:","sourceCodeStart":662,"sourceCodeEnd":698,"githubUrl":"https://github.com/rohitg00/ai-engineering-from-scratch/blob/39ea8a1c6d0b61f071226eff7ede4d4105fed820/phases/13-tools-and-protocols/28-mcp-tool-contracts-and-content/code/main.py#L662-L698","documentation":"Error \"tools/list page limit must be a positive integer\" thrown in rohitg00/ai-engineering-from-scratch.","triggerScenarios":"Thrown at phases/13-tools-and-protocols/28-mcp-tool-contracts-and-content/code/main.py:680 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"39ea8a1c6d0b61f071226eff7ede4d4105fed820","analyzedAt":"2026-08-26T03:13:46.626Z","schemaVersion":2},"datasetVersion":"2026-08-26T07:17:17.940Z"}