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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteThe available evidence does not establish what happened when the same failures were injected into five MCP SDKs: it contains no test procedure, pinned SDK builds, failure cases, or recorded outcomes. The SDK documentation does show why a fair comparison matters: a tool can return an error result without failing the request, while a protocol error or timeout may take a different path.
Here is what the documented behavior supports—and where it stops short of proving an experimental result.
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What the five SDK documents establish
These are documentation behaviors, not results from a shared test harness. The pages cover different languages and scopes, and do not identify a common version, transport, or set of injected failures.
| SDK | Documented behavior | What it does not establish |
|---|---|---|
| Python | The server error-handling guide distinguishes tool execution errors, request-level protocol errors, and unexpected exceptions. It describes unexpected exceptions as sanitized error results with traceback details logged server-side; invalid arguments may be rejected against the input schema before the handler runs. | How a particular injected failure behaved in a particular build or transport. |
| Java | The server guide recommends returning a CallToolResult with isError(true) for recoverable validation or domain errors, and JSON-RPC errors for uncaught, unexpected failures. |
Empirical caller-visible messages, logs, or outcomes from the five-SDK experiment. |
| Go | The protocol guide describes cancellation using context cancellation and a notifications/cancelled message. It warns that sending the notification does not guarantee the peer observed it before the RPC exits. |
Whether a server in a specific test received, processed, or stopped work after cancellation. |
| Rust | The SDK repository documents cancellation handling and HTTP transport control-request timeout options. Its README discusses protocol revisions through 2026-07-28. | A single version-independent timeout or cancellation outcome; those behaviors depend on the SDK and transport details. |
| TypeScript | The surfaced client documentation separates tool results marked isError from request exceptions, and states a 60-second default timeout that sends a cancellation notification. |
Whether this repository represents the official TypeScript SDK, or whether a server observed cancellation in a test. |
Why a tool error is not necessarily a failed MCP request
In the Python and Java guidance, an operation can fail while still returning a tool result: Python calls out ToolError, and Java recommends a result marked with isError(true) for recoverable validation or domain problems. A request-level protocol error is a different path. Python describes MCPError for that case; Java recommends a JSON-RPC error for uncaught, unexpected failures.
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The Python documentation offers a practical rule of thumb: “One question decides it: could a smarter model have avoided this? Yes -> ToolError. No -> MCPError.” That is guidance from the Python SDK project, not a normative rule for every MCP SDK.
Why a timeout does not prove cancellation worked
A client timing out and a server stopping work are separate events. Go’s protocol guide explicitly cautions that the peer is not guaranteed to have observed a sent cancellation notification when the RPC exits. The surfaced TypeScript client documentation says its default timeout is 60 seconds and that it sends a cancellation notification, but that statement alone does not show what the remote server received or did.
To compare cancellation empirically, a report would need to distinguish the client’s timeout, notification transmission, server receipt, and actual handler termination. The cited documentation does not provide those observations for the same test conditions.
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What a defensible five-SDK result needs
A useful comparison should report the exact inputs and observations rather than treating “error” as one outcome. At minimum, record:
- SDK package and pinned version, protocol revision, transport, and relevant timeout settings.
- Each injected failure and whether argument validation prevented handler execution.
- Whether the caller received a normal tool result marked as an error, a request exception, a structured protocol error, or a timeout.
- What was visible to the caller versus what appeared in server logs, including whether unexpected exception details were sanitized.
- For cancellation, whether a notification was sent, observed by the server, and followed by handler termination.
Without those details and the actual test records, the documentation supports a map of likely distinctions to inspect—not a ranking of which SDK handled injected failures best.
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