Create a bill from a chat/photo and share it with anyone
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Average 3.2/5 across 3 of 3 tools scored.
The three tools target distinct actions: creating a bill, updating a bill, and batch-setting selections. There is no overlap in purpose.
All tools follow a consistent verb_noun pattern in snake_case (e.g., create_bill, update_bill, set_bill_selections_batch), with clear and predictable naming.
With only 3 tools, the server feels bare for a bill-splitting domain. Operations like viewing, deleting, or finalizing bills are missing, making the tool count insufficient for a typical workflow.
The surface is severely incomplete: there are no tools to read (get/list) bills, delete bills, or settle splits. Agents cannot perform basic retrieval or complete the lifecycle of a bill.
create_billCreate BillCInspectCreates a new bill.
| Name | Required | Description | Default |
|---|---|---|---|
| info | Yes | Additional bill information | |
| items | Yes | Bill items | |
| title | Yes | Bill title | |
| total_price | Yes | Bill total price, VAT and Taxes are included in this price |
| Name | Required | Description |
|---|---|---|
| id | Yes | Bill ID |
| info | Yes | Additional bill information |
| items | Yes | Bill items with selections |
| title | Yes | Bill title |
| owner_id | Yes | Bill owner user ID |
| share_url | Yes | Bill share URL |
| created_at | Yes | Creation time in RFC3339 UTC |
| updated_at | Yes | Update time in RFC3339 UTC |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations are present but provide no constraints (all false). The description only says 'creates', implying mutation, but adds no detail on side effects, permissions, idempotency, or what happens to existing data. Behavioral context is minimal beyond the annotation defaults.
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 extremely concise at four words, with no redundant information. However, it is perhaps too brief for a tool with nested objects and an output schema. Overall, it is well-structured but borderline under-specified.
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?
Despite having an output schema and complex parameters, the description provides no context about return values, usage examples, or how it differs from 'update_bill'. The tool is adequately documented via schema but lacks contextual completeness for an AI agent to use effectively.
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% with descriptions for all parameters. The description adds no additional meaning beyond the schema, so the baseline score of 3 is appropriate.
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 'Creates a new bill' clearly states the verb (creates) and resource (bill). It distinguishes from siblings like 'update_bill' and 'set_bill_selections_batch', though it does not elaborate on what a 'bill' represents in this context. Overall, it is clear and specific enough.
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 guidance is provided on when to use this tool versus siblings. The description does not mention any prerequisites, conditions, or scenarios where this tool is preferred. This is a significant gap given the presence of related tools.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
set_bill_selections_batchSet Bill Selections BatchASaves current user selections for all bill items in one request.
| Name | Required | Description | Default |
|---|---|---|---|
| bill_id | Yes | Bill ID to update selections for | |
| selections | Yes | Selections by item |
| Name | Required | Description |
|---|---|---|
| id | Yes | Bill ID |
| info | Yes | Additional bill information |
| items | Yes | Bill items with selections |
| title | Yes | Bill title |
| owner_id | Yes | Bill owner user ID |
| share_url | Yes | Bill share URL |
| created_at | Yes | Creation time in RFC3339 UTC |
| updated_at | Yes | Update time in RFC3339 UTC |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate idempotentHint true and destructiveHint false; the description adds that it saves selections in one request but does not disclose other behavioral traits such as overwrite behavior or permissions.
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?
A single front-loaded sentence that efficiently conveys the tool's purpose with no unnecessary 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?
For this simple batch update tool, the description is adequate. The output schema exists, but the description could clarify whether selections are merged or replaced.
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?
With 100% schema coverage, the description adds no additional meaning beyond the schema's parameter 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 clearly states the action (saves) and the target (current user selections for all bill items) in one request, distinguishing it from siblings like create_bill and update_bill.
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 usage for batch saving selections but provides no explicit guidance on when to use this tool vs alternatives, nor when not to use it.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
update_billUpdate BillCUpdates an existing bill.
| Name | Required | Description | Default |
|---|---|---|---|
| info | Yes | Additional bill information | |
| items | Yes | Bill items | |
| title | Yes | Bill title | |
| bill_id | Yes | Bill ID to update | |
| total_price | Yes | Bill total price, VAT and Taxes are included in this price |
| Name | Required | Description |
|---|---|---|
| id | Yes | Bill ID |
| info | Yes | Additional bill information |
| items | Yes | Bill items with selections |
| title | Yes | Bill title |
| owner_id | Yes | Bill owner user ID |
| share_url | Yes | Bill share URL |
| created_at | Yes | Creation time in RFC3339 UTC |
| updated_at | Yes | Update time in RFC3339 UTC |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already indicate it's not read-only, not destructive, and idempotent. The description merely says 'updates' without elaborating on permissions, side effects, or constraints (e.g., whether missing fields are reset). No contradiction with annotations, but the description adds no behavioral context beyond the obvious.
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 concise sentence with no fluff. It conveys the essential action efficiently. However, it could include a brief mention of typical use without significantly increasing length.
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 complexity (5 parameters, nested objects) and the presence of an output schema, the description is too minimal. It does not explain the update semantics (e.g., full replacement vs partial update), nor does it address prerequisites or output expectations. The output schema may cover return values, but the description should at least hint at the scope of the update.
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%: all 5 parameters have detailed descriptions in the input schema. The tool description adds no extra meaning beyond what's already documented structurally, so a baseline score of 3 is appropriate.
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 verb 'updates' and the resource 'existing bill', effectively communicating the tool's primary action. It distinguishes from sibling tools like create_bill (create new) and set_bill_selections_batch (batch operations on selections). However, it could be more specific about which bill attributes are modifiable, as implied by the input schema.
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 no guidance on when to use this tool versus its siblings. It does not specify prerequisites (e.g., bill must exist) or alternative tools for different scenarios. The sibling list includes create_bill and set_bill_selections_batch, but no explanation of trade-offs is given.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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