serial_enter_uboot

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

No annotations are present, so the description carries full responsibility. It discloses the reboot side effect, configurable detection rules, fallback to 'printenv', and failure modes (kernel boot or verify timeout). This is rich transparency.

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?

Three sentences, each adding value: purpose, strategy/config, and failure behavior. 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?

Covers the tool's entire workflow: reboot, detection, fallback, and failure. No output schema exists, but the description does not need to explain return values as it's a side-effectful operation. Only minor omission is explicit prerequisite of an open serial session, but session_id implies it.

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% for both parameters. The description reinforces the timeout behavior by mentioning a 'short window' and 'fails fast,' adding strategic context beyond the schema's definition. session_id is left to the schema, which is sufficient.

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 opens with a specific action—'Enter U-Boot by rebooting the device and stopping autoboot'—and includes a mechanism (reboot + autoboot stop). This clearly distinguishes it from sibling serial tools like serial_exec or serial_shell_login.

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?

It describes the tool's role in the boot process and explains the detection strategy, but it does not explicitly state when to prefer this over alternatives or when not to use it. The context is clear for bootloader access, but no exclusions are given.

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