uploadStickerFile

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

No annotations exist, so the description carries the full burden. It conveys that this is a state-changing upload ('Upload... for later use' implying server-side persistence) and discloses the success return value. However, it does not cover failure modes, side effects (the file is stored and tied to the owning user), or prerequisites, which an agent would need to anticipate errors when invoking the tool.

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?

Two sentences with zero filler. The first sentence front-loads the verb, object, and purpose; the second covers the return value. Nothing repeats schema content or the tool's name, and every word earns its place.

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 3-parameter upload helper with no output schema, the description is largely complete: it states purpose, names the consuming methods so the agent understands the file_id handoff workflow, covers the return value, and is backed by a fully-described schema. The main gap is failure-mode context and explicit instructions that the returned file_id is the 'sticker' input for the named methods, but these are minor.

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 100%: all three parameters (sticker, user_id, sticker_format) carry thorough descriptions including format mapping and a technical-requirements link. The description adds workflow context but no parameter-level semantics beyond what the schema already provides, so the baseline 3 applies.

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 ('Upload a file with a sticker') and clarifies the purpose ('for later use in the createNewStickerSet, addStickerToSet, or replaceStickerInSet methods'). Naming the three consuming methods distinguishes this preparatory upload from siblings like sendSticker, getFile, and the set-manipulation tools. The return value ('Returns the uploaded File on success') is also disclosed.

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 description makes the workflow context explicit: this tool is a preparatory step before exactly three named methods. It does not explicitly state when-not-to-use or name alternatives (e.g., 'use sendSticker to deliver a sticker to a chat'), so it falls just short of full exclusion guidance, but the named consumers give an agent strong routing signals.

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