MCP Firebird

Describe Function

describe-function

Read-onlyIdempotent

Retrieve detailed information about a Firebird function, including its source code for PSQL functions, to understand its implementation.

Instructions

Gets detailed information about a specific function, including its source code (for PSQL functions)

Input Schema

TableJSON Schema

Name	Required	Description	Default
`functionName`	Yes	Name of the function to describe

Output Schema

TableJSON Schema

Name	Required	Description
`error`	No	Failure information; present when success is false
`result`	No	The legacy JSON payload; present for completed operations and partial batches
`success`	Yes	False for tool failures, including partially failed batches

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedv2.12.0Oct 7, 2026

changedInput schema / $schema

Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"

removedInput schema / additionalProperties
```
Removed value: -false
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$defs": {
+    "__schema0": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "number"
+        },
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        },
+        {
+          "items": {
+            "$ref": "#/$defs/__schema0"
+          },
+          "type": "array"
+        },
+        {
+          "additionalProperties": {
+            "$ref": "#/$defs/__schema0"
+          },
+          "propertyNames": {
+            "type": "string"
+          },
+          "type": "object"
+        }
+      ]
+    },
+    "__schema1": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "number"
+        },
+        {
+          "type": "boolean"
+        },
+        {
+          "type": "null"
+        },
+        {
+          "items": {
+            "$ref": "#/$defs/__schema1"
+          },
+          "type": "array"
+        },
+        {
+          "additionalProperties": {
+            "$ref": "#/$defs/__schema1"
+          },
+          "propertyNames": {
+            "type": "string"
+          },
+          "type": "object"
+        }
+      ]
+    }
+  },
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "additionalProperties": false,
+  "properties": {
+    "error": {
+      "additionalProperties": false,
+      "description": "Failure information; present when success is false",
+      "properties": {
+        "details": {
+          "additionalProperties": {
+            "$ref": "#/$defs/__schema1"
+          },
+          "propertyNames": {
+            "type": "string"
+          },
+          "type": "object"
+        },
+        "message": {
+          "type": "string"
+        },
+        "type": {
+          "type": "string"
+        }
+      },
+      "required": [
+        "message",
+        "type"
+      ],
+      "type": "object"
+    },
+    "result": {
+      "additionalProperties": false,
+      "description": "The legacy JSON payload; present for completed operations and partial batches",
+      "properties": {
+        "description": {
+          "$ref": "#/$defs/__schema0"
+        },
+        "entryPoint": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "moduleName": {
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "name": {
+          "type": "string"
+        },
+        "returnArgument": {
+          "type": "number"
+        },
+        "source": {
+          "$ref": "#/$defs/__schema0"
+        },
+        "validBlr": {
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "name",
+        "returnArgument",
+        "validBlr"
+      ],
+      "type": "object"
+    },
+    "success": {
+      "description": "False for tool failures, including partially failed batches",
+      "type": "boolean"
+    }
+  },
+  "required": [
+    "success"
+  ],
+  "type": "object"
+}

Changed1 schema field changedv2.9.0Aug 20, 2026
- changedInput schema / properties / functionName / description
```
Previous value: -"Nombre de la función a describir"New value: +"Name of the function to describe"
```
Addedv2.8.1Jun 29, 2026

TDQS

A3.6/5.0

Behavior3/5

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

The annotations already declare readOnlyHint, idempotentHint, non-destructive, and closed-world, so the safety profile is covered. The description adds one genuinely useful behavioral detail — that source code is returned for PSQL functions — which hints at potentially large/sensitive output, but says nothing about behavior for non-PSQL functions or error cases (e.g., unknown name).

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?

One sentence, front-loaded with the action and resource, with the qualifier placed where it belongs. No filler or restated boilerplate.

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?

With an output schema present, return-field documentation is unnecessary, and the sole required parameter is fully covered by the schema. The description is adequate for a simple read tool; the only gap is the absence of any usage/alternative guidance, which is a minor omission at this complexity.

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% with a single documented parameter, so the schema carries the load and baseline 3 applies. The description adds no extra meaning such as schema-qualification, case sensitivity, or overload disambiguation for the functionName argument.

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 (Gets) and resource (detailed information about a specific function), and the parenthetical about source code clarifies what 'detailed information' includes. It is clearly distinguishable in intent from list-functions and describe-procedure, though it never names a sibling to reinforce that contrast.

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?

Usage is only implied by the name and the word 'specific' — an agent can infer this is the lookup tool for one function versus listing tools. There is no explicit when-to-use, when-not-to-use, or named alternative (e.g., list-functions for enumerating).

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.