fs_shimcache

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden. It states 'Read-only via RegRipper,' indicating no modification. It also specifies the data type (paths and timestamps). This is sufficient, though it could mention that it requires a Windows system image.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is three sentences, each earning its place: purpose, prerequisite, and safety. It is front-loaded with the key action, and every word adds value with no redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the existence of an output schema and the tool's specific forensic focus, the description covers the essential aspects: data source, data content, prerequisite, and behavior. It is complete enough for an agent to select and use effectively, though it omits platform assumptions.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, and the description does not explain any of the three parameters (image, hive_inode, offset). The only hint is the prerequisite about fs_find, which relates to hive_inode. The description fails to add meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool extracts 'program-execution evidence' from the Shimcache, specifying 'paths and timestamps of binaries that ran or were present.' This is a specific verb-resource combination that distinguishes it from siblings like fs_amcache or fs_registry.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description explicitly says to 'Find the SYSTEM hive inode with fs_find first,' providing a clear prerequisite. However, it lacks explicit when-not-to-use instructions or alternative tool mentions, slightly reducing guidance.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.