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

Beyond the annotations, it discloses the user-visible consequence (articles stop appearing in list_news) and, crucially, that re-adding is instant — which explains why destructiveHint=false is trustworthy and frames the operation as reversible. It does not mention what happens on repeat removal, leaving idempotentHint=false unexplained.

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 short sentences: action plus identifier source first, consequences second. Every clause carries information; nothing is padding.

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 one-parameter removal tool with annotations and no output schema, the description covers what it does, when to do it, and what changes afterward. Minor gaps: error behavior for an unknown or already-removed source, and whether previously generated posts from that source persist.

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 the single parameter already says 'Source id from list_news_sources'. The description repeats that provenance without adding format, validation, or failure semantics, so the schema is doing the work — baseline 3.

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 ('Remove one of the user's news sources') and pins down the identifier source ('id from list_news_sources'). The clause about articles disappearing from list_news makes the effect distinct from the sibling add_news_source without ambiguity.

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?

'on their word' is an explicit gating condition: only act when the user asks directly, not proactively. The pointer to list_news_sources covers the prerequisite for obtaining the id. It stops short of naming add_news_source as the inverse operation, so it's clear context rather than full alternative routing.

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