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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so safety is covered. The description adds genuine behavioral value by specifying the exact return shape (every ancestor/descendant/depth pair, including self-pairs at depth 0), which is not in any structured field since no output schema exists.

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?

Front-loaded with the core action and kept to two sentences. The parenthetical definition of a bundle is helpful context; the trailing 'Useful for...' sentence is slightly weaker but not wasteful.

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, the description usefully explains the closure return format, which is what an agent most needs here. For a single-parameter read tool whose annotations already cover the safety profile, this is nearly complete, minor gap being no explicit sibling routing.

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 coverage is 100% and the single parameter rootKey is fully documented as 'the node_key of the bundle root'. The description adds no parameter-level detail beyond the schema, 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 ('List') and resource ('everything beneath one item in a bundle') and clarifies the bundle concept as an ordered outline of memories. It defines the return semantics (ancestor/descendant/depth pairs) precisely, though it doesn't explicitly name a sibling to differentiate from, e.g., muninn_bundle_get or muninn_bundle_list.

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?

'Useful for checking what a section contains' gives an implied use case, but there is no explicit when-to-use guidance and no contrast with alternatives like muninn_bundle_get. The condition selecting this over other bundle reads is left to inference.

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