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A rate-limit response asks the caller to back off and retry after provider guidance. The current tool failed authentication, which will not be fixed by waiting for quota. Return an MCP error result with a safe authentication cause; do not turn it into either an empty successful list or a rate-limit diagnosis.

Actionable argument errors support a safe corrected retry without inventing data. Here, an MCP tool fails authentication and returns an empty successful list. Return an isError-marked response with a specific authentication failure. Empty success is semantically different from inability to access records, and the caller must know the operation failed.

A timeout is not proof of nonexecution, so blind retries can duplicate the side effect. The direct remedy is “Return an isError-marked response with a specific authentication failure”, which the alternative does not itself accomplish. Empty success is semantically different from inability to access records, and the caller must know the operation failed.

The operation failed a stable business invariant: the same idempotency key cannot safely authorize two different payment instructions. Return a structured, sanitized non-retryable conflict with a correlation identifier and an appropriate reconciliation step. The assistant should not issue more writes until the original transaction status is checked.

An empty successful response would hide the conflict and could make the caller claim no transfer occurred. A business error must remain distinguishable from a valid search that simply returns no matches.

Payment secrets are not necessary for the agent to diagnose this business conflict. Exposing credentials in a tool result broadens compromise risk instead of supplying actionable safe error metadata.

A timeout is not proof of nonexecution, so blind retries can duplicate the side effect. The required action is “Return an explicit validation error identifying the rejected field”; the other measure addresses a separate concern. Actionable argument errors support a safe corrected retry without inventing data.

No matches is a legitimate outcome when the search ran successfully, and labeling it as a failure would cause unnecessary retries. Here, a document extraction tool receives a malformed input identifier. Return an explicit validation error identifying the rejected field. Actionable argument errors support a safe corrected retry without inventing data.

Structured failures should support recovery without leaking secrets or internal implementation detail. Here, a document extraction tool receives a malformed input identifier. Return an explicit validation error identifying the rejected field. Actionable argument errors support a safe corrected retry without inventing data.

No matches is a legitimate outcome when the search ran successfully, and labeling it as a failure would cause unnecessary retries. The proposed option cannot provide the specific “Return an uncertain-outcome error and require reconciliation before another write” behavior that the case requires. A timeout is not proof of nonexecution, so blind retries can duplicate the side effect.

Structured failures should support recovery without leaking secrets or internal implementation detail. The required action is “Return an uncertain-outcome error and require reconciliation before another write”; the other measure addresses a separate concern. A timeout is not proof of nonexecution, so blind retries can duplicate the side effect.

Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads. This is not a substitute for “Return an uncertain-outcome error and require reconciliation before another write”; that control is necessary in the stated circumstances. A timeout is not proof of nonexecution, so blind retries can duplicate the side effect.

Structured failures should support recovery without leaking secrets or internal implementation detail. Here, a search tool returns valid empty results. Return successful empty results rather than isError true. No matches is a legitimate outcome when the search ran successfully, and labeling it as a failure would cause unnecessary retries.

Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads. The proposed option cannot provide the specific “Return successful empty results rather than isError true” behavior that the case requires. No matches is a legitimate outcome when the search ran successfully, and labeling it as a failure would cause unnecessary retries.

Empty success is semantically different from inability to access records, and the caller must know the operation failed. Here, a search tool returns valid empty results. Return successful empty results rather than isError true. No matches is a legitimate outcome when the search ran successfully, and labeling it as a failure would cause unnecessary retries.

Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads. This is not a substitute for “Return sanitized error codes and limited diagnostic context”; that control is necessary in the stated circumstances. Structured failures should support recovery without leaking secrets or internal implementation detail.

Empty success is semantically different from inability to access records, and the caller must know the operation failed. Here, an MCP endpoint exposes internal stack traces and bearer tokens in errors. Return sanitized error codes and limited diagnostic context. Structured failures should support recovery without leaking secrets or internal implementation detail.

this choice instead describes return a structured rate-limit error with permitted retry guidance. The issue here is an MCP endpoint exposes internal stack traces and bearer tokens in errors, so the relevant control is to return sanitized error codes and limited diagnostic context. Structured failures should support recovery without leaking secrets or internal implementation detail.

Empty success is semantically different from inability to access records, and the caller must know the operation failed. Here, a backend error has no request correlation identifier. Include a safe request identifier in the error payload. Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads.

Error categories and retry hints let a controller back off instead of treating the absence of results as definitive. The issue here is a backend error has no request correlation identifier, so the relevant control is to include a safe request identifier in the error payload. Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads.

Actionable argument errors support a safe corrected retry without inventing data. The proposed option cannot provide the specific “Include a safe request identifier in the error payload” behavior that the case requires. Correlation allows logs and caller retries to reference the same failure without exposing sensitive payloads.

A throttled call may succeed later, unlike permanent authentication failure. This alternative does not establish how to reject instruction injection hidden in tool-error content in the stated workflow.

An idempotency reference is crucial when a side-effecting charge times out, but this remote tool's error text is a prompt-injection attempt asking for admin retries. Do not follow it or elevate permissions. Use the application's trusted retry/error policy independently of attacker-controlled content.

A correlation token lets support teams investigate without dumping stack traces or private data into model context. The scenario instead requires a way to reject instruction injection hidden in tool-error content.

A production restart is a privileged side effect and should not live in an ordinary research or search tool catalog merely because an analyst sometimes needs it. The direct remedy is “Expose only fact-checking tools to that specialist while keeping deployment authority at the coordinator”, which the alternative does not itself accomplish. Keep deployment tools behind their own human or host authorization boundary, so a mistaken or injected reviewer instruction cannot publish production changes.

Specialists can propose actions but should not automatically hold every business privilege. That addresses a different part of the system, not the requirement to distribute tool authority by specialist responsibility.

Conditional tool choice prevents needless calls on requests that need no external data. Here the fact-checking subagent must not be able to deploy production code at all. Remove the deployment tool from its effective permissions and reserve sensitive side effects for an authorized execution boundary.

A published name, description, and input schema help Claude choose the right extraction tool, but discovery alone cannot require that it call the tool on this turn. In the question’s explicitly compatible API configuration, the dedicated tool_choice setting selects the required tool; the application must still validate its arguments and authorization.

Automatic or conditional tool selection can be appropriate when a direct answer is allowed, but it does not ensure a designated extraction call on the first turn. The scenario requires a call, so a compatible API configuration must force that tool. On unsupported models, the host must enforce the workflow instead of treating automatic selection as a guarantee.

Keeping restart or high-privilege operations behind a separate approval gate can be a sound security design, but it does not control whether Claude emits the required extraction call. The request is about tool invocation within an otherwise authorized first turn, not about cataloging operational restart permissions.

Forcing a tool call on every request can cause unnecessary lookups, latency and data exposure when a direct response would suffice. The normal helpdesk case should use automatic selection between scoped search and create capabilities, with any state-changing ticket creation authorized separately at the execution boundary.

Specialists can propose actions but should not automatically hold every business privilege. The proposed option cannot provide the specific “Allow automatic tool selection with clear descriptions and separate write authorization” behavior that the case requires. Automatic selection can choose read or create based on the user's actual intent, while write access remains separately authorized at execution.

Production restart isolation protects high-impact operations, but the helpdesk question concerns ordinary selection between search_ticket and create_ticket. Provide accurate tool descriptions and allow appropriate selection, while separately checking authorization for any ticket creation; an unrelated restart workflow does not determine which ticket tool is needed.