read_registry_key

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

With no annotations provided, the description carries full burden and explicitly states behavioral traits: 'opened for reading only,' binary values returned as hex and truncated, and non-existent keys handled without failure. This provides clear insight into tool behavior.

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 well-structured with an Args section and clear parameter explanations. It is concise yet comprehensive, though slightly verbose with the docstring style. Every sentence adds value without unnecessary fluff.

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 presence of an output schema, the description appropriately explains return behavior (binary truncated as hex) and error handling. It covers all parameters and usage context, making it a complete resource for selecting and invoking the tool.

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?

Despite 0% schema description coverage, the tool description compensates by explaining all parameters in detail: path format with hive abbreviations, view choices, and include_subkeys functionality. This adds significant meaning beyond the bare 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 'Read every value under a registry key,' specifying the action and resource. It distinguishes from the sibling 'read_registry_value' by focusing on reading all values under a key, and mentions listing immediate child keys via include_subkeys.

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 explains parameter usage with examples (hive abbreviations, view options) and notes that non-existent keys are reported without failure. However, it does not explicitly contrast with the sibling read_registry_value for single value access, leaving room for ambiguity in tool selection.

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