ebi-pdbe-molecules_ent_molecules_id_1cb4fd01

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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered. With no output schema, the enumerated field list (entity type, UniProt-mapped names, synonyms, sequence, chains, copy numbers, organism, ligand info) is genuinely useful disclosure of what comes back, but the description says nothing about 'summarised' depth, selective versus full retrieval, or why idempotentHint is false for an apparently read-only fetch.

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 a single front-loaded sentence that names the resource first and then the contents, with no filler or duplicated phrasing. The long semicolon-chained field inventory is dense but each item is substantive, though a short structured list would read better than one run-on clause.

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 read-only lookup with a simple two-parameter schema and no output schema, the field enumeration largely substitutes for return-value documentation. What is missing is the relationship between the required pdb_id and optional entity_id (all entities versus one), and any note about response size or shape when an entry contains many entities.

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%, so both pdb_id and entity_id are documented in the schema. However, the description describes fetching 'each molecule' in an entry and never explains that the optional entity_id narrows the response to a single entity — a meaningful behavioral nuance the schema text does not convey beyond labelling it 'Entity id'.

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 states a specific verb and resource: it returns summarised molecule/entity information for a given PDB entry, and clarifies the mmcif terminology ('entity'). It is clear what the tool produces, but it never distinguishes itself from close siblings such as ebi-pdbe-bound_molecules_bound_molecules_id_433acab7 or ebi-pdbe-chains_ent_chains_id_entity_id_200017f6, so the agent must infer the difference from names alone.

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 when-to-use guidance, no exclusions, and no mention of any alternative tool in a sibling list packed with molecule-, chain-, and ligand-oriented endpoints. The only implied usage is 'fetch entity metadata for a PDB entry', which the agent could guess from the name.

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