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

Beyond the annotations (readOnlyHint=false, openWorldHint=true), the description discloses key behavioral traits: persistence ('Disimpan permanen di Workers KV sampai di-overwrite'), overwrite semantics, and the reset behavior ('Kirim tanpa salah satu parameter (undefined) untuk reset field itu balik ke default'). It also reveals that the thresholds affect other tools by replacing their defaults, giving the agent a complete understanding of side effects.

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?

The description is three sentences long and every sentence earns its place: the first states the core action, the second explains the rationale, and the third covers persistence and reset. It is front-loaded with the primary operation, avoids fluff, and is appropriately sized for the tool's complexity.

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 low-complexity mutation tool with no output schema, the description is quite complete: it covers purpose, when to use, persistence, reset behavior, and the relationship to other tools. The only notable omission is the lack of explicit information about the return value/response format, which an agent would need to confirm success. Given the simplicity, this gap is minor but still present.

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% and each parameter already has detailed descriptions with examples and default values (e.g., basisThreshold: 'default (0.0005)', fundingThreshold: 'default (0.0003)'). The description adds the percentage equivalents (±0.03%, ±0.05%) and clarifies reset semantics, but these are largely redundant with the schema's 'kosongkan' instructions. Therefore, the description provides marginal additional value beyond the schema.

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 clearly states the tool's action ('Simpan threshold funding rate dan/atau basis custom untuk sebuah pair') and identifies the resource (per-pair thresholds). It distinguishes itself from siblings by explicitly referencing the default thresholds used by binance_get_funding_rate and binance_get_spot_price and by complementing the getter binance_get_pair_threshold. The mention of 'menggantikan default hardcoded' makes the unique purpose obvious.

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 provides strong contextual usage guidance by explaining why custom thresholds are needed: 'pair volatil (altcoin kecil) dan pair stabil (BTC/ETH) punya rentang funding/basis normal yang beda jauh -- threshold universal bisa false-positive di pair volatil atau kurang sensitif di pair stabil.' This tells the agent when the tool is appropriate. It also describes how to reset fields to default, but it does not explicitly state when not to use the tool or name alternative setters (though none exist).

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