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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds that the link is personal and per-contact and that it subscribes the contact to the bot, but it does not say whether the link is stable across calls or expires, which matters because repeated generation could invalidate earlier links. The added context is real but incomplete.

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 short clauses, each carrying a distinct fact: the parameter meaning, what the link does, and where to place the output. There is no filler. Minor deduction for mixing French prose with an English-named tool family and for placing the parameter definition first rather than leading with what the tool returns.

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-only tool with no output schema and no nested objects, the definition covers the essentials: input meaning, output nature, and the templating use case. The remaining gap is behavioral (link lifetime/reuse) rather than structural, so the definition is close to sufficient.

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 description coverage is 0%, so the description must carry the burden, and it does define the single parameter as "id = identifiant du contact". That clarifies the identifier refers to a contact rather than a workspace, message or bot, which is the key ambiguity for a 1-parameter tool. It stops short of noting the positive-integer constraint, but that is visible in the schema itself.

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 conveys the resource ("Lien t.me personnel qui abonne ce contact au bot Telegram") but frames it as a noun phrase rather than a verb+resource operation, and never uses a verb like "get" or "generate". It is understandable but does not distinguish this tool from nearby siblings such as setup_telegram_webhook or send_telegram.

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 gives one concrete usage hint — "Dans un email, {{telegram_link}} insère ce lien" — which tells the agent where the output belongs. However, it never states when to fetch this link versus sending a Telegram message directly, nor any preconditions such as the contact needing an existing Telegram conversation.

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