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Agent Reliability

by dev.agentreliability
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Get one Agent Reliability knowledge object

get_entity
Read-onlyIdempotent

Fetch one knowledge object by id, with its claims and the sources each claim cites. Use this once search, answer or get_topic has given you an id. An unknown id is not a dead end: the answer names near-miss ids you can retry with.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
idYesThe knowledge object's id, as returned by search, answer, get_topic or get_related — the last segment of its canonical URL.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
foundYes
entityNo
recoveryNo

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • addedOutput schema / properties / entity / properties / x
      Added value: +{
+  "additionalProperties": {
+    "additionalProperties": {},
+    "propertyNames": {
+      "type": "string"
+    },
+    "type": "object"
+  },
+  "description": "Indexed instance-specific attributes, grouped by namespace — the same fields api/index.json publishes. Absent when the instance declares none.",
+  "propertyNames": {
+    "type": "string"
+  },
+  "type": "object"
+}
  2. Changed3 schema fields changed
    • addedInput schema / properties / id / description
      Added value: +"The knowledge object's id, as returned by search, answer, get_topic or get_related — the last segment of its canonical URL."
    • addedOutput schema / properties / entity / properties / media
      Added value: +{
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "alt": {
+        "type": "string"
+      },
+      "caption": {
+        "type": "string"
+      },
+      "credit": {
+        "type": "string"
+      },
+      "height": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "id": {
+        "type": "string"
+      },
+      "license_spdx": {
+        "type": "string"
+      },
+      "permissions": {
+        "additionalProperties": {
+          "type": "boolean"
+        },
+        "propertyNames": {
+          "type": "string"
+        },
+        "type": "object"
+      },
+      "supports": {
+        "type": "string"
+      },
+      "url": {
+        "type": "string"
+      },
+      "width": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      }
+    },
+    "required": [
+      "id",
+      "url",
+      "alt",
+      "credit",
+      "license_spdx",
+      "permissions"
+    ],
+    "type": "object"
+  },
+  "type": "array"
+}
    • changedOutput schema / properties / entity / required
      Previous value: -[
-  "id",
-  "type",
-  "name",
-  "summary",
-  "tags",
-  "evidence_tier",
-  "confidence",
-  "last_verified",
-  "canonical_url",
-  "api_url",
-  "questions",
-  "claims"
-]New value: +[
+  "id",
+  "type",
+  "name",
+  "summary",
+  "tags",
+  "evidence_tier",
+  "confidence",
+  "last_verified",
+  "canonical_url",
+  "api_url",
+  "questions",
+  "claims",
+  "media"
+]
  3. Changed1 schema field changed
    • addedOutput schema / properties / recovery
      Added value: +{
+  "additionalProperties": false,
+  "properties": {
+    "available": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "available_count": {
+      "maximum": 9007199254740991,
+      "minimum": -9007199254740991,
+      "type": "integer"
+    },
+    "available_truncated": {
+      "type": "boolean"
+    },
+    "did_you_mean": {
+      "items": {
+        "type": "string"
+      },
+      "type": "array"
+    },
+    "hint": {
+      "type": "string"
+    },
+    "next_tool": {
+      "type": "string"
+    }
+  },
+  "required": [
+    "available_count",
+    "available",
+    "next_tool",
+    "hint"
+  ],
+  "type": "object"
+}
  4. First observed

TDQS

A4.2/5.0
Behavior4/5

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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering the safety profile. The description adds useful behavioral context beyond that: an unknown id is not a dead end, and the answer names near-miss ids to retry. This is meaningful supplementary information.

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, each earning its place: the operation and result, the precondition for calling, and the failure-mode behavior. It is front-loaded with the core purpose and contains no filler.

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?

For a single-parameter tool with an output schema and strong annotations, the description is nearly complete. It covers what is returned, when to call it, and what happens with an unknown id. The only minor gap is the omitted get_related source in the usage sentence, but the schema compensates for that.

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%, and the schema already explains that id comes from search, answer, get_topic, or get_related and is the last segment of the canonical URL. The tool description reinforces the source of the id but does not add meaningful parameter semantics beyond the schema.

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?

The description uses a specific verb ('Fetch'), names a precise resource ('one knowledge object by id'), and states the included content ('its claims and the sources each claim cites'). This clearly distinguishes it from sibling tools like get_latest, get_overview, and get_sources.

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?

The description gives explicit invocation timing: use it once search, answer, or get_topic has produced an id. It does not explicitly contrast against sibling tools, and it omits get_related which the schema mentions as an id source, but the core usage context is clear.

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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