Ausca

Request bounded cancellation

ausca_cancel_invocation

DestructiveIdempotent

Request bounded cancellation of one invocation. Cancellation is idempotent, may be refused, and may lose a race with terminal completion.

Input Schema

Name	Required	Description	Default
`invocation_id`	Yes

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedOct 25, 2026

removedOutput schema / $defs / ArtifactEvidence / properties / artifact_ref
```
Removed value: -{
-  "$ref": "#/$defs/ArtifactRef"
-}
```
addedOutput schema / $defs / ArtifactEvidence / properties / artifact_uri
```
Added value: +{
+  "$ref": "#/$defs/ArtifactUri"
+}
```

changedOutput schema / $defs / ArtifactEvidence / required

Previous value: -[
-  "artifact_ref",
-  "content_digest",
-  "media_type",
-  "size_bytes",
-  "created_at"
-]New value: +[
+  "artifact_uri",
+  "content_digest",
+  "media_type",
+  "size_bytes",
+  "created_at"
+]

removedOutput schema / $defs / ArtifactRef

Removed value: -{
-  "description": "Opaque artifact reference minted by artifact commitment. Relay it unchanged; its form is not part of the contract.",
-  "maxLength": 512,
-  "minLength": 1,
-  "type": "string"
-}

addedOutput schema / $defs / ArtifactUri

Added value: +{
+  "description": "Opaque artifact reference minted by artifact commitment. Relay it unchanged; its form is not part of the contract.",
+  "maxLength": 512,
+  "minLength": 1,
+  "type": "string"
+}

Changed1 schema field changedSep 24, 2026

changedOutput schema / oneOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "invocation": {
-        "$ref": "#/$defs/InvocationState"
-      },
-      "status": {
-        "enum": [
-          "cancellation_requested",
-          "already_terminal"
-        ],
-        "type": "string"
-      }
-    },
-    "required": [
-      "status",
-      "invocation"
-    ],
-    "type": "object"
-  },
-  {
-    "$ref": "#/$defs/RefusedResult"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "invocation": {
+        "$ref": "#/$defs/InvocationState"
+      },
+      "status": {
+        "enum": [
+          "cancellation_requested"
+        ],
+        "type": "string"
+      }
+    },
+    "required": [
+      "status",
+      "invocation"
+    ],
+    "type": "object"
+  },
+  {
+    "$ref": "#/$defs/RefusedResult"
+  }
+]

Changed7 schema fields changedSep 18, 2026
- addedOutput schema / $defs / ArtifactRef / description
```
Added value: +"Opaque artifact reference minted by artifact commitment. Relay it unchanged; its form is not part of the contract."
```
- addedOutput schema / $defs / ArtifactRef / maxLength
```
Added value: +512
```
- addedOutput schema / $defs / ArtifactRef / minLength
```
Added value: +1
```
- removedOutput schema / $defs / ArtifactRef / pattern
```
Removed value: -"^runx:artifact:sha256:[a-f0-9]{64}$"
```
- addedOutput schema / $defs / ReceiptReference / properties / uri / description
```
Added value: +"Opaque receipt identity minted by the notary. Relay it unchanged; its form is not part of the contract."
```
- changedOutput schema / $defs / ReceiptReference / properties / uri / minLength
```
Previous value: -14New value: +1
```
- removedOutput schema / $defs / ReceiptReference / properties / uri / pattern
```
Removed value: -"^runx:receipt:.+$"
```

Changed6 schema fields changedSep 7, 2026

addedOutput schema / $defs / ArtifactEvidence

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "artifact_ref": {
+      "$ref": "#/$defs/ArtifactRef"
+    },
+    "content_digest": {
+      "$ref": "#/$defs/Digest"
+    },
+    "created_at": {
+      "format": "date-time",
+      "type": "string"
+    },
+    "media_type": {
+      "maxLength": 200,
+      "minLength": 1,
+      "type": "string"
+    },
+    "size_bytes": {
+      "maximum": 26214400,
+      "minimum": 1,
+      "type": "integer"
+    }
+  },
+  "required": [
+    "artifact_ref",
+    "content_digest",
+    "media_type",
+    "size_bytes",
+    "created_at"
+  ],
+  "type": "object"
+}

addedOutput schema / $defs / ArtifactRef

Added value: +{
+  "pattern": "^runx:artifact:sha256:[a-f0-9]{64}$",
+  "type": "string"
+}

addedOutput schema / $defs / InvocationFailure

Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "code": {
+      "maxLength": 96,
+      "minLength": 1,
+      "type": "string"
+    },
+    "message": {
+      "maxLength": 500,
+      "minLength": 1,
+      "type": "string"
+    }
+  },
+  "required": [
+    "code",
+    "message"
+  ],
+  "type": "object"
+}

addedOutput schema / $defs / InvocationState / properties / failure
```
Added value: +{
+  "$ref": "#/$defs/InvocationFailure"
+}
```
addedOutput schema / $defs / InvocationState / properties / output_artifact
```
Added value: +{
+  "$ref": "#/$defs/ArtifactEvidence"
+}
```

addedOutput schema / $defs / ReceiptReference / properties / public_url

Added value: +{
+  "description": "Unguessable public verification page for the privacy-bounded hash-only proof. It reveals the receipt digest, service, public price, and completion time, but not input bytes, output bytes, or their content digests.",
+  "format": "uri",
+  "maxLength": 2048,
+  "pattern": "^https://[^?#]+/r/[a-f0-9]{64}$",
+  "type": "string"
+}

Changed1 schema field changedSep 7, 2026

removedOutput schema / $defs / ReceiptReference / properties / public_url

Removed value: -{
-  "description": "Unguessable public verification page for the privacy-bounded hash-only proof. It reveals the receipt digest, service, public price, and completion time, but not input bytes, output bytes, or their content digests.",
-  "format": "uri",
-  "maxLength": 2048,
-  "pattern": "^https://[^?#]+/r/[a-f0-9]{64}$",
-  "type": "string"
-}

Changed1 schema field changedSep 3, 2026

addedOutput schema / $defs / ReceiptReference / properties / public_url

Added value: +{
+  "description": "Unguessable public verification page for the privacy-bounded hash-only proof. It reveals the receipt digest, service, public price, and completion time, but not input bytes, output bytes, or their content digests.",
+  "format": "uri",
+  "maxLength": 2048,
+  "pattern": "^https://[^?#]+/r/[a-f0-9]{64}$",
+  "type": "string"
+}

First observedSep 1, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already declare idempotentHint=true, so repeating idempotency earns nothing, but the description adds genuinely new behavior: cancellation may be refused and may race against terminal completion, which tells the agent the outcome is not guaranteed. It does not say what work is discarded despite destructiveHint=true, nor what refusal 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.

Conciseness5/5

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

Two sentences, zero filler, with the identification of the operation and its outcome caveats front-loaded.

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

Completeness4/5

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

An output schema exists so return shape needn't be explained, and annotations carry the safety profile (destructive, open-world). The description covers the surprising semantics of an unreliable cancellation; only authorization requirements and the fate of in-flight work are 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?

Only one parameter with 0% schema description coverage, so the description must compensate; it clarifies that exactly one invocation is targeted (no batch or list form), which is useful. It adds nothing about the identifier itself, though the schema pattern and length constraints document the format.

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

Purpose5/5

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

States a specific verb and resource ('cancellation of one invocation') and adds a meaningful qualifier ('bounded'), which no sibling tool carries. An agent can tell this apart from ausca_get_invocation or ausca_prepare_invocation without consulting the schema.

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?

'of one invocation' implies the scope is a single target rather than a batch, and 'may be refused' hints at preconditions, but there is no explicit when-to-use versus when-to-use-an-alternative guidance and no stated prerequisites.

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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