CueFrame

Cancel Render

cancel_render

Idempotent

Cancel an in-flight render (stop a runaway/queued job). Needs projectId + renderId (from create_render). No-op if already terminal.

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": {
      "projectId": "<projectId>",
      "renderId": "<renderId>"
    },
    "name": "cancel_render"
  }
}

Input Schema

Name	Required	Description
`renderId`	Yes	renderId (path).
`commandId`	No	Retry identity. A call repeated with the same commandId returns the first result instead of acting twice.
`projectId`	Yes	projectId (path).

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 28, 2026
- addedInput schema / $defs
```
Added value: +{
+  "__schema0": {
+    "maxLength": 128,
+    "minLength": 1,
+    "type": "string"
+  }
+}
```
- addedInput schema / properties / commandId / $ref
```
Added value: +"#/$defs/__schema0"
```
- removedInput schema / properties / commandId / maxLength
```
Removed value: -128
```
- removedInput schema / properties / commandId / minLength
```
Removed value: -1
```
- removedInput schema / properties / commandId / type
```
Removed value: -"string"
```

Changed1 schema field changedOct 22, 2026

addedInput schema / properties / commandId

Added value: +{
+  "description": "Retry identity. A call repeated with the same commandId returns the first result instead of acting twice.",
+  "maxLength": 128,
+  "minLength": 1,
+  "type": "string"
+}

First observedOct 10, 2026

TDQS

A4.1/5.0

Behavior4/5

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

Annotations already declare idempotentHint=true and destructiveHint=false, so the bar is lower; the description still adds real context by explaining that terminal-state calls are a no-op and by naming the origin of renderId. It stops short of saying what the render's resulting state or artifacts look like after cancellation.

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

Conciseness5/5

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

Three short sentences, front-loaded with the action, then prerequisites, then the edge-case behavior. No filler or restatement of the tool name.

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

Completeness5/5

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

For a three-parameter, no-output-schema cancellation tool with rich annotations, the description covers action, required inputs, provenance, and terminal-state behavior. Nothing an agent needs in order to call it correctly is missing.

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

Parameters3/5

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

Schema description coverage is 100%, so both required params and commandId are already documented in the schema. The description adds only the provenance note that renderId comes from create_render, and says nothing about commandId's retry semantics — baseline 3 applies.

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 and resource ('Cancel an in-flight render') plus the scope of what qualifies (runaway/queued job). The resource noun 'render' implicitly separates it from cancel_compose, cancel_export, and cancel_job, though no sibling is named explicitly.

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

Usage Guidelines4/5

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

'Cancel an in-flight render (stop a runaway/queued job)' gives a clear condition for use, and 'No-op if already terminal' tells the agent it is safe to call without first checking state. It does not, however, mention alternatives such as retry_render for jobs that failed rather than need stopping.

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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