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

Annotations already declare readOnlyHint=false, destructiveHint=false and idempotentHint=true, so the safety profile is covered. The description adds genuinely new context beyond that: the change is 'remembered' (persisted) and the client refreshes its tool list, which tells the agent a re-listing side effect follows the call.

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, front-loaded with the effect on tools/list and followed by the constraint and side effect. No filler, though the parenthetical '(remembered)' is slightly terse for a property as important as persistence.

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?

With no output schema and a single fully-documented parameter, the description covers the essentials: the effect, the constraint, persistence, and the client-side refresh. It stops short of stating error behavior for non-allowed packs or whether the addition merges with already-enabled packs, which is the main remaining gap.

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?

Only one parameter and schema description coverage is 100%: the schema already says it is an array of required pack ids sourced from list_packs. The description adds nothing about id format, max size, or what happens if a mix of allowed and disallowed ids is supplied, so 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?

The description states a concrete verb and resource: it adds pack ids to the tools/list for 'this connection'. Combined with the name enable_packs and the sibling pair disable_packs/list_packs, an agent can tell what it does, though the 'tools/list' phrasing is protocol jargon that takes a moment to parse.

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?

Usage is implied rather than stated: 'Only allowed packs can be listed' hints that disallowed packs will not take effect, and the schema points to list_packs as the id source. There is no explicit when-to-use versus disable_packs, no prerequisite about how packs are made 'allowed', and no statement about behavior on an invalid id.

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