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

Annotations already declare readOnly/non-destructive/closed-world, and the description adds real behavior beyond them: per-protocol option defaults and ranges, a 2000-frame pagination limit via offset, error flags on UART frames, and a 'problems' field for doubtful decoding. It omits auth/session prerequisites, which is the remaining gap.

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?

Purpose is front-loaded in the first clause, and nearly every clause carries payload. But it is a dense run-on of semicolon-separated fragments with inline JSON-ish notation that is hard to scan for a fast-moving agent.

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?

No output schema exists, and the description compensates by documenting the return envelope and per-protocol frame shapes (t_us, value, error, cs-low framing, i2c start/restart/ack). The missing pieces are session/agent_token semantics and confirmation of the capture identifier format.

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 0%, so the description carries the burden, and it does so well: it enumerates every channel pin set per protocol, the full options vocabulary with defaults (baud 9600, bits 8, parity none, mode 0, bit_order), and explains offset through the 2000-frame window. It never explains 'session' or 'agent_token', leaving two of seven params undocumented.

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?

States a specific verb and resource ('Decode a ready logic capture of the session') plus scope (browser or bench). It does not name the sibling it differs from (read_capture, capture_logic), so the agent must infer which one produces vs consumes a capture.

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 phrase 'ready ... capture' implies a precondition, but the description never says when to use this versus read_capture or capture_logic, nor what to do if decoding fails or the capture isn't ready. Usage is only implied.

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