Alias of calculate_cas. Headless MCP-only CAS evaluator; if unsupported features are requested, returns GUI handoff details.
| Name | Required | Description | Default |
|---|---|---|---|
| strict | No | If true, reject unknown fields and malformed expressions instead of dropping them | |
| expression | No | Single CAS expression to evaluate | |
| expressions | No | Optional ordered list of CAS expressions to evaluate in one isolated context (supports assignments across the batch) |
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the burden. It discloses headless, MCP-only nature and GUI handoff behavior for unsupported features, adding useful context. However, it does not mention side effects, permission requirements, or what a normal successful response looks like.
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 compact (two clauses separated by a semicolon) and front-loaded with the core function and alias. Every sentence earns its place, though 'Alias of calculate_cas' is somewhat redundant with the tool name.
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?
The tool has no output schema, so the description must explain return values. It only mentions GUI handoff for unsupported features, not what a successful evaluation returns. It also does not explain parameter interactions (e.g., expression vs expressions) or when to use one over the other.
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%, so baseline 3 applies. The description adds no additional meaning about parameters beyond the schema descriptions; it does not clarify expression syntax, strict mode behavior, or how expression and expressions relate.
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?
Description clearly states it is a 'Headless MCP-only CAS evaluator,' indicating the tool evaluates CAS expressions. It also identifies as an alias of calculate_cas, providing differentiation from sibling tools like calculate and session management tools, though the alias reference is indirect.
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 guidance on when to use this tool vs alternatives. The alias reference implies interchangeability with calculate_cas, and the GUI handoff note hints at limitations, but there is no clear 'when to use' or 'when not to use' direction.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.
calculate_cas and calculate_cas_headless are explicitly aliases, creating two tools for the same purpose. Also, calculate and generate_prefilled_url both produce prefilled URLs, so their boundaries are not fully distinct.
Most tools follow a verb_noun pattern (calculate, create_session, get_session_state, list_calculators). The main deviation is calculate_cas_headless, which still fits the pattern but is an awkward alias name.
The 10-tool count is reasonable for a calculator service with session management. However, the alias tool is redundant and could be removed without losing functionality.
The tool set covers listing calculators, getting schemas, running calculations (standard and CAS), managing sessions, and generating URLs. Minor gaps like a dedicated way to delete sessions are addressed by close_session, so coverage is adequate.