Nova Cast

Select

select

Destructive

Typed component select through the active sandbox. Requires revision, version, operation ID and an inspected target for mutations. Returns observed state. Five-second timeout is unknown outcome; never retry with a new ID.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "operationID": "<operationID>",
      "expectedRevision": "<expectedRevision>",
      "componentID": "<componentID>",
      "expectedComponentVersion": "<expectedComponentVersion>",
      "selector": "<selector>",
      "targetID": "<targetID>",
      "value": "<value>",
      "controlToken": "<controlToken>"
    },
    "name": "select"
  }
}

Input Schema

Name	Required	Description	Default
`value`	Yes
`selector`	Yes
`targetID`	Yes
`componentID`	Yes
`operationID`	Yes
`controlToken`	Yes
`expectedRevision`	Yes
`expectedComponentVersion`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

AddedOct 2, 2026

TDQS

B3.4/5.0

Behavior4/5

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

Adds real value beyond the annotations (destructiveHint=true, openWorldHint=true): it discloses the five-second timeout behavior, the 'unknown outcome' failure semantics, the never-retry-with-new-ID rule, and that it returns observed state. It does not specify exactly what the mutation destroys, keeping it short of a 5.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Four compact sentences, front-loaded with the operation then prerequisites then return/error semantics. Little waste, though 'through the active sandbox' is somewhat redundant framing.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness3/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a destructive, open-world mutation with 8 required undocumented parameters and no output schema, the description covers prerequisites, return value, and the timeout/retry hazard, which is meaningful. However the missing param semantics and lack of any note on permissions or reversibility leave gaps.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0% across 8 required parameters, so the description must compensate. It only loosely references four of them (revision, version, operation ID, inspected target) and says nothing about selector, value, componentID, or controlToken, leaving half the parameters unexplained.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb (select) and resource (typed component through the active sandbox), which distinguishes it from siblings like click and fill. The phrasing 'typed component select' is slightly jargon-heavy but an agent can identify the operation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It implies prerequisites ('Requires revision, version, operation ID and an inspected target for mutations'), suggesting a prior inspect call, but never states when NOT to use this tool or names the alternative siblings for related actions. Usage is inferred rather than explicit.

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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