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

Annotations already communicate that this is a non-read-only, non-idempotent, non-destructive operation. The description adds useful context by specifying that the playlist is private and the mix is 'fresh,' but it does not go beyond that into auth requirements, rate limits, or 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 a single sentence with no filler and puts the core purpose first. It is concise, though it is also somewhat under-specified rather than fully informative.

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?

Even though an output schema exists and annotations cover basic safety, the description omits important constraints such as the lower/upper seed bounds, the limit default, and how this creation flow behaves after invocation. The tool could be called incorrectly because key behavioral details are left to inference.

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 0%, so the description carries the burden of explaining parameters. It only hints at the seed-count range for queries and does not address title, description, or limit. The 'two-to-ten-seed' constraint is useful but not tied explicitly to the queries parameter.

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 specific action and resource: 'Create one private playlist from a fresh two-to-ten-seed radio mix.' This clearly distinguishes it from sibling read-style tools like get_multi_seed_radio and search_songs, and from the likely single-seed variant create_private_radio_playlist.

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 phrase 'two-to-ten-seed radio mix' implies the tool is for creating a playlist from multiple seeds, but it never explicitly says when to use this tool versus create_private_radio_playlist or get_multi_seed_radio. No exclusions or alternative routing are provided.

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

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

Annotations already indicate readOnlyHint=false and destructiveHint=false, so the description adds little beyond confirming it creates a playlist. It does mention 'fresh song-radio queue,' which hints at creating a new queue, but it doesn't disclose other traits like whether the playlist is immediately visible or if it requires an existing radio queue. Since annotations cover the safety profile, the description meets the minimum but doesn't enrich behavioral context.

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 a single, front-loaded sentence that states the action and the key context. It is efficient and free of filler. However, it could arguably be slightly more detailed without becoming verbose, but it does not waste words.

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?

Given the tool has 4 parameters (2 required), no parameter descriptions, and an output schema, the description is far from complete. It doesn't explain how to construct the arguments, what the 'fresh song-radio queue' means in practice, or how it differs from the multi-seed variant. The presence of an output schema does not help with input construction. An agent would struggle to call this tool correctly without additional information.

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 0%, meaning none of the parameters (title, query, limit, description) are documented in the schema. The description provides no information about what these parameters mean or how to use them. An agent would have to guess that 'query' is the seed song and 'title' is the playlist name, which is not obvious. The description completely fails to compensate for the missing schema documentation.

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 uses a specific verb ('Create') and a specific resource ('private playlist') and adds a distinguishing context: 'from a fresh song-radio queue in the connected account.' This clearly separates it from sibling create_private_multi_seed_radio_playlist, which implies a multi-seed radio. The purpose is unambiguous and actionable.

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 implies a use case (creating a private playlist from a single song-radio queue) but does not explicitly state when to choose this tool over the multi-seed sibling or get_song_radio. There is no mention of alternatives or exclusions. The context is present but not formalized, so an agent might need to infer the distinction.

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

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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and destructiveHint false, so safety context is covered. The description adds meaningful behavioral detail beyond annotations: the round-robin combination strategy, the two-to-ten cardinality constraint, and deduplication of results.

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?

One compact, front-loaded sentence with no wasted words. Every phrase adds useful information about the tool's behavior.

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 read-only, idempotent tool with an output schema, the description covers the essential invocation details: seed count range, combination method, and deduplication. It does not spell out the exact output shape, but the output schema handles that.

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 0%, so the description carries the burden for parameter meaning. It implies that 'queries' must contain two to ten song seeds, but it does not explicitly define what a query represents or explain how 'limit' controls the result size. This is adequate but incomplete.

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 names a specific action ('round-robin'), the resource ('two to ten song radios'), and the outcome ('one deduplicated result'). It clearly distinguishes this multi-seed combination behavior from siblings like get_song_radio and create_private_multi_seed_radio_playlist.

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 use case is clear: combine multiple YouTube Music song radios into a single result. It does not explicitly state when to prefer this over create_private_multi_seed_radio_playlist or get_song_radio, but the behavior and sibling names make the intended context apparent.

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

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

Annotations already cover read-only, idempotent, non-destructive behavior, so the description only needs to add selection and ordering semantics. 'Ordered' reveals result ordering, and 'around the first song match' explains how the query is resolved. This adds value beyond the annotations without contradicting them.

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 a single, focused sentence with no filler. It front-loads the key resource and operation before adding the qualifier, making it easy to scan and understand.

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 simple read-only tool with an output schema and strong annotations, the description is largely sufficient. The remaining gaps—unexplained limit semantics and lack of explicit alternative guidance—are minor but prevent a perfect score.

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 0%, so the description must compensate. It implicitly clarifies that query is the song search whose first match seeds the radio, but it says nothing about limit, leaving its meaning—number of tracks, number of radio items, or search results—to inference from the default of 30.

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 specific verb ('Get'), a clear resource ('YouTube Music song radio'), and a precise behavior ('ordered radio recommendations around the first song match'). The single-seed 'first song match' phrasing distinguishes it from siblings like get_multi_seed_radio and search_songs.

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?

No explicit when-to-use or when-not-to-use guidance is provided. The phrase 'around the first song match' implies a single-song seed, which indirectly separates it from get_multi_seed_radio, but the description does not directly name alternatives or state selection criteria.

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

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

Annotations already signal a non-readOnly, non-idempotent, non-destructive action. The description adds a useful concurrency warning that goes beyond the annotations, but it does not explain what resuming entails in practice, such as whether it activates the plan, starts playback, or mutates saved state.

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 a single sentence with no filler. It front-loads the core purpose and includes the important concurrency warning, so 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?

Given only one parameter and an output schema, a short description is acceptable. However, the lack of any playlist_id guidance and any explicit sibling differentiation leaves the definition minimally complete for an agent deciding when and how to invoke it.

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 0% and the description never mentions playlist_id or how to obtain it. The parameter name and 'saved track plan' give minimal implicit meaning, but the description does not compensate for the missing schema documentation.

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 uses a specific verb ('Resume') and a concrete resource ('one exact saved track plan'), and the title clarifies it applies to a private playlist. This distinguishes it from siblings like search_songs or create_private_radio_playlist, though it does not explicitly contrast itself with them and 'exact' is slightly vague.

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 only usage guidance is the negative constraint 'do not invoke concurrently.' There is no explicit statement about when to choose this tool over the search or create siblings, though the semantics imply it is for resuming an existing saved plan rather than creating or searching.

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

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

Annotations already declare readOnly=true, openWorld=true, idempotent=true, and destructive=false, covering safety and side effects. The description adds valuable context about the return fields (IDs, artists, album titles, durations, links), which is beyond what annotations provide. No contradictions exist.

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 a single, tight sentence that states the core function and the data provided. No filler or redundancy; it is front-loaded with the action and resource.

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?

Given a simple search tool with an output schema (present but not shown) and clear annotations, the description covers the essential purpose and returned data. It does not detail pagination or result count, but the presence of an output schema and annotations make this unnecessary. It is adequate for a tool of this complexity.

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 0%, yet the description does not explain the meaning of 'query' or 'limit'. While 'query' is intuitively a search string, 'limit' is not described (e.g., max results). The description only lists output fields, not input semantics, so it fails to compensate for the empty schema descriptions.

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 begins with a specific verb ('Find') and a defined resource ('songs') plus the key data returned (IDs, artists, album titles, durations, links). It unambiguously separates this from sibling tools that generate radios or playlists, so an agent knows exactly what this tool accomplishes.

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 implies the use case (searching for songs) and the sibling tools are so distinct (radio/playlist creation) that no explicit when-not guidance is necessary. An agent can infer this is the tool for song discovery without ambiguity, though it does not explicitly name alternatives.

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