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Tool descriptions should help the model recognize when a tool is useful. The decisive requirement here is to surface consequential side effects before tool invocation.

Models select argument values using schema and descriptions. This alternative does not establish how to surface consequential side effects before tool invocation in the stated workflow.

Rejecting malicious tool-metadata instructions protects policy boundaries, but this subscription tool's description is incomplete rather than adversarial. State clearly that invoking it creates a paid charge and requires authorization. Untrusted-data treatment alone cannot tell an operator about hidden financial side effects.

A well-designed tool should request only the data needed for its action. The scenario instead requires a way to define whether a tool accepts one item or many.

Models select argument values using schema and descriptions. Although useful elsewhere, it is not the direct mechanism to define whether a tool accepts one item or many.

Tool descriptions should help the model recognize when a tool is useful. The proposed option cannot provide the specific “Specify a single tracking_id argument and expose a separate batch lookup if supported” behavior that the case requires. A typed tracking_id field should accept one supported identifier, with an explicit array-based batch endpoint if bulk queries are allowed.

Opaque account identifiers avoid exposing passwords during lookups, but the search results here mix invoices and support tickets without type labels. The response needs typed source, record ID and field metadata so the agent can distinguish different entity kinds before summarizing.

Metadata distrust is important if a returned description attempts to override instructions. This result instead lacks a schema that distinguishes invoice records from ticket records. Add type and provenance fields to each search hit; filtering prompt-injection text would not clarify ordinary data types.

Separating effects makes least-privilege scoping and confirmation easier. That addresses a different part of the system, not the requirement to make heterogeneous tool outputs self-describing.

A narrow read-only tool list reduces what a specialist can invoke, but it does not correct a lookup tool that demands full customer passwords as a required argument. Redesign its credential contract around an authorized opaque account ID or delegated identity token instead of distributing secrets.

Separating effects makes least-privilege scoping and confirmation easier. This alternative does not establish how to minimize sensitive input required by tools in the stated workflow.

Tool descriptions are part of the model's decision interface. Although useful elsewhere, it is not the direct mechanism to minimize sensitive input required by tools.

A well-designed tool should request only the data needed for its action. That addresses a different part of the system, not the requirement to manage breaking tool schema changes predictably.

Tool descriptions are part of the model's decision interface. This alternative—Name tools for the user-visible action they perform and describe when to invoke them—does not implement the specific operation that the question asks about. The required control is Version the schema or provide a compatibility mapping with clear deprecation guidance. Stable tool contracts matter as much as implementation.

Requiring invoice_id improves validation for payment requests, but it does not address a response contract renamed from address to mailing_address. Existing clients expect the former field. Version the interface or provide a documented compatibility alias before removing the old field.

Retrieved descriptions are not an authority to override host policies or grant tools extra access. Execution permissions must be enforced independently of any untrusted metadata or prompt-injection text.

Describing that a subscription call charges money is vital for a payment tool, but the retrieved description here tells Claude to ignore security policies. This is untrusted instruction text, not a valid specification change. Keep authorization decisions in the platform and disregard the hostile directive.

Tool descriptions should help the model recognize when a tool is useful. It would leave the stated need to keep tool discovery separate from authority to act unresolved.

A precise schema rejects incomplete calls before side effects. This alternative does not establish how to remove ambiguous units from state-changing tool arguments in the stated workflow.

A side-effectful interface needs clear semantics and approval expectations. Although useful elsewhere, it is not the direct mechanism to remove ambiguous units from state-changing tool arguments.

A constrained schema reduces unsupported requests and makes valid choices unambiguous. The scenario instead requires a way to remove ambiguous units from state-changing tool arguments.

Explicit amount and currency types are essential for a payment tool, but the current failure is selection between two tools both described vaguely as 'get information.' Tightening a financial amount schema cannot tell Claude which tool performs which operation. Give the two tools distinct purposes, descriptions and expected input use cases.

Constrained output preserves context budget and avoids burying relevant evidence. This is not a substitute for “Give each tool a distinct purpose, input semantics and selection guidance”; that control is necessary in the stated circumstances. Clear descriptions let a model choose the proper capability instead of guessing among similarly named tools.

Correctly required inputs let validation reject incomplete calls before execution. The issue here is two tools both have vague descriptions such as 'get information', so the relevant control is to give each tool a distinct purpose, input semantics and selection guidance. Clear descriptions let a model choose the proper capability instead of guessing among similarly named tools.

The tool should require a deterministic identity selection rule, such as exactly one recognized identifier or a validated match when both are present. A conflict must return a specific input error rather than silently using the wrong account. This protects downstream authorization and avoids leaking another customer's information.

Broadly returning unrelated customers exposes more sensitive information and still leaves ambiguity unresolved. The caller should be asked for a valid unambiguous selector, not handed a bulk result to guess from.

A read-only lookup can disclose private account data or feed later write operations. Server-side argument validation therefore remains essential even when the immediate tool does not modify the database.

this choice instead describes make genuinely mandatory identifiers required in the input schema. The issue here is a search tool returns an entire document corpus for every narrow query, so the relevant control is to return bounded task-relevant results with a request-more-detail mechanism. Constrained output preserves context budget and avoids burying relevant evidence.

Clear distinctions between reads and writes prevent a retrieval intent from selecting a destructive capability. Here, a search tool returns an entire document corpus for every narrow query. Return bounded task-relevant results with a request-more-detail mechanism. Constrained output preserves context budget and avoids burying relevant evidence.

Untrusted search text must not redefine the meaning or authorization of a tool interface. The direct remedy is “Return bounded task-relevant results with a request-more-detail mechanism”, which the alternative does not itself accomplish. Constrained output preserves context budget and avoids burying relevant evidence.

A prompt cannot retrieve records that the tool never returned or establish where the next page begins. The missing information is a result-contract property that the tool provider must supply.

Declaring the first page exhaustive when a backend truncates at 100 records creates a false completeness guarantee. Pagination boundaries must be represented in actual tool output, not assumed by the consumer.

Deleting history changes customer data and is unrelated to safe pagination. It would sacrifice auditability and might violate retention obligations merely to avoid specifying a proper result contract.