plc_bind_io

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

Annotations already declare this is a non-read-only, non-destructive, non-idempotent, closed-world mutation, so the safety profile is covered. The description adds genuinely useful failure behavior (rejection of occupied, incompatible, and overlapping output aliases), but it never explains what "stage" means operationally — that the change is pending until committed, repeat-call idempotency, or what happens on a stale expected_revision.

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?

It is short — two sentences with no filler — which is a genuine strength. But the front-loaded sentence crams three vague qualifiers together, so brevity comes at the cost of parseability rather than through precision.

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?

This is a transactional mutation with four required parameters, 25% schema coverage, and a complex domain (PLC I/O binding). An output schema exists so return values needn't be explained, but the transaction workflow and the meaning of the required identifiers are absent, leaving the agent without enough to invoke it correctly.

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 only 25% (only expected_revision is documented in the schema), so the description carries the burden of explaining the other three required parameters. It does not: transaction_id's origin, variable_id's meaning, and the accepted address syntax are all left undefined, and "address" is only alluded to in passing.

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 verb+resource ("Stage a binding") is identifiable and implicitly distinguishes it from the sibling plc_unbind_io, so the core action is discoverable. However, the qualifiers "an originally observed address or enabled configured port resolved by an exact local profile" are dense jargon that an agent cannot reliably decode without domain knowledge, obscuring what kinds of targets are actually valid.

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?

There is no statement of when to use this versus plc_unbind_io, plc_list_io, or plc_assign_program, and no workflow context even though the tool requires a transaction_id. The only guidance is an implicit precondition ("originally observed address", "exact local profile"), which tells the agent nothing actionable about sequencing or when staging is appropriate.

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