esp32_gpio_read

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

With no annotations, the description must carry the behavioral load: it does disclose the read-only nature and the allow-list restriction, both of which are non-obvious operational facts. It does not say what error surfaces for a disallowed pin, whether reading has side effects, or anything about rate/latency, so meaningful gaps remain.

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?

Two tight sentences with no filler, and the core action is front-loaded before the constraint. Nothing wastes space, though there is room to fold in a routing hint without bloating it.

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?

For a single-parameter read with no output schema, the description usefully states what comes back (mode and digital level) and flags the allow-list precondition. The remaining gap is error behavior for blocked pins, which is minor for a tool this simple.

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 coverage is 100%, and the single 'pin' parameter is fully documented in the schema with type, range, and an example. The description adds no further semantics about pin selection or numbering beyond what the schema already provides, so the baseline 3 applies.

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?

Names a specific verb and resource ('Read the mode and digital level of one GPIO pin'), which clearly separates it from the write-oriented siblings like esp32_gpio_write and esp32_set_relay. It stops short of naming those alternatives explicitly, so sibling differentiation is implied rather than stated.

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 only guidance is a constraint — 'Only pins in the firmware allow list can be read' — which tells the agent when the call will fail but not when to prefer this tool over esp32_gpio_write or esp32_read_sensors. Usage context is inferable from the read verb but never spelled out.

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