List every database connection registered for your tenant: name, id, dbType (postgres / mysql / mssql), createdAt. Flags duplicate names — only the first-added connection of a duplicate name is reachable by name. Returns nothing sensitive (no DSN, no credentials).
| Name | Required | Description | Default |
|---|---|---|---|
No arguments | |||
| Name | Required | Description | Default |
|---|---|---|---|
| data | No | ||
| meta | No | ||
| display | No | ||
| summary | No | ||
| insights | No |
Changes observed during successful MCP inspections.
Output schema / properties / data / anyOfPrevious value: -[
- {
- "items": {
- "additionalProperties": true,
- "properties": {
- "createdAt": {
- "type": [
- "string",
- "number",
- "null"
- ]
- },
- "dbType": {
- "anyOf": [
- {
- "enum": [
- "postgres",
- "mysql",
- "mssql"
- ],
- "type": "string"
- },
- {
- "type": "string"
- }
- ]
- },
- "id": {
- "type": "string"
- },
- "name": {
- "type": "string"
- }
- },
- "required": [
- "name",
- "id",
- "dbType"
- ],
- "type": "object"
- },
- "type": "array"
- },
- {
- "additionalProperties": true,
- "properties": {
- "code": {
- "type": "string"
- },
- "details": {
- "additionalProperties": {},
- "type": "object"
- },
- "error": {
- "type": "string"
- },
- "internal_code": {
- "type": "string"
- },
- "message": {
- "type": "string"
- },
- "retry_after_s": {
- "type": "number"
- }
- },
- "type": "object"
- }
-]New value: +[
+ {
+ "items": {
+ "additionalProperties": true,
+ "properties": {
+ "createdAt": {
+ "type": [
+ "string",
+ "number",
+ "null"
+ ]
+ },
+ "dbType": {
+ "anyOf": [
+ {
+ "enum": [
+ "postgres",
+ "mysql",
+ "mssql"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "id": {
+ "type": "string"
+ },
+ "name": {
+ "type": "string"
+ }
+ },
+ "required": [
+ "name",
+ "id",
+ "dbType"
+ ],
+ "type": "object"
+ },
+ "type": "array"
+ },
+ {
+ "additionalProperties": true,
+ "properties": {
+ "code": {
+ "type": "string"
+ },
+ "details": {
+ "additionalProperties": {},
+ "type": "object"
+ },
+ "error": {
+ "type": "string"
+ },
+ "internal_code": {
+ "type": "string"
+ },
+ "message": {
+ "type": "string"
+ },
+ "retry_after_s": {
+ "type": "number"
+ }
+ },
+ "required": [
+ "error"
+ ],
+ "type": "object"
+ }
+]Output schema / properties / display / properties / mapAdded value: +{
+ "additionalProperties": true,
+ "properties": {
+ "label": {
+ "type": "string"
+ },
+ "lat": {
+ "type": "string"
+ },
+ "lon": {
+ "type": "string"
+ },
+ "title": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+}Output schema / properties / display / properties / type / anyOfPrevious value: -[
- {
- "enum": [
- "table",
- "chart",
- "metric",
- "code",
- "text",
- "list"
- ],
- "type": "string"
- },
- {
- "type": "string"
- }
-]New value: +[
+ {
+ "enum": [
+ "table",
+ "chart",
+ "metric",
+ "code",
+ "text",
+ "list",
+ "map"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+]Output schema / (root)Previous value: -nullNew value: +{
+ "$schema": "http://json-schema.org/draft-07/schema#",
+ "additionalProperties": true,
+ "properties": {
+ "data": {
+ "anyOf": [
+ {
+ "items": {
+ "additionalProperties": true,
+ "properties": {
+ "createdAt": {
+ "type": [
+ "string",
+ "number",
+ "null"
+ ]
+ },
+ "dbType": {
+ "anyOf": [
+ {
+ "enum": [
+ "postgres",
+ "mysql",
+ "mssql"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "id": {
+ "type": "string"
+ },
+ "name": {
+ "type": "string"
+ }
+ },
+ "required": [
+ "name",
+ "id",
+ "dbType"
+ ],
+ "type": "object"
+ },
+ "type": "array"
+ },
+ {
+ "additionalProperties": true,
+ "properties": {
+ "code": {
+ "type": "string"
+ },
+ "details": {
+ "additionalProperties": {},
+ "type": "object"
+ },
+ "error": {
+ "type": "string"
+ },
+ "internal_code": {
+ "type": "string"
+ },
+ "message": {
+ "type": "string"
+ },
+ "retry_after_s": {
+ "type": "number"
+ }
+ },
+ "type": "object"
+ }
+ ]
+ },
+ "display": {
+ "additionalProperties": true,
+ "properties": {
+ "chart": {
+ "additionalProperties": true,
+ "properties": {
+ "chartType": {
+ "type": "string"
+ },
+ "color": {
+ "type": "string"
+ },
+ "title": {
+ "type": "string"
+ },
+ "x": {
+ "type": "string"
+ },
+ "xLabel": {
+ "type": "string"
+ },
+ "y": {
+ "anyOf": [
+ {
+ "type": "string"
+ },
+ {
+ "items": {
+ "type": "string"
+ },
+ "type": "array"
+ }
+ ]
+ },
+ "yLabel": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "code": {
+ "additionalProperties": true,
+ "properties": {
+ "executable": {
+ "type": "boolean"
+ },
+ "language": {
+ "anyOf": [
+ {
+ "enum": [
+ "sql",
+ "json",
+ "bash",
+ "typescript"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "title": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+ },
+ "metric": {
+ "additionalProperties": true,
+ "properties": {
+ "label": {
+ "type": "string"
+ },
+ "status": {
+ "anyOf": [
+ {
+ "enum": [
+ "good",
+ "warning",
+ "critical"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "trend": {
+ "anyOf": [
+ {
+ "enum": [
+ "up",
+ "down",
+ "neutral"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "trendValue": {
+ "type": "string"
+ },
+ "unit": {
+ "type": "string"
+ },
+ "value": {
+ "type": [
+ "string",
+ "number"
+ ]
+ }
+ },
+ "type": "object"
+ },
+ "type": {
+ "anyOf": [
+ {
+ "enum": [
+ "table",
+ "chart",
+ "metric",
+ "code",
+ "text",
+ "list"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ }
+ },
+ "type": "object"
+ },
+ "insights": {
+ "items": {
+ "additionalProperties": true,
+ "properties": {
+ "column": {
+ "type": "string"
+ },
+ "message": {
+ "type": "string"
+ },
+ "severity": {
+ "anyOf": [
+ {
+ "enum": [
+ "info",
+ "warning",
+ "critical"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "value": {}
+ },
+ "required": [
+ "severity",
+ "message"
+ ],
+ "type": "object"
+ },
+ "type": "array"
+ },
+ "meta": {
+ "additionalProperties": true,
+ "properties": {
+ "cacheHit": {
+ "type": "boolean"
+ },
+ "connection": {
+ "type": "string"
+ },
+ "dialect": {
+ "anyOf": [
+ {
+ "enum": [
+ "postgres",
+ "mysql",
+ "mssql"
+ ],
+ "type": "string"
+ },
+ {
+ "type": "string"
+ }
+ ]
+ },
+ "executionTimeMs": {
+ "type": [
+ "number",
+ "string"
+ ]
+ },
+ "plan": {},
+ "rowCount": {
+ "$ref": "#/properties/meta/properties/executionTimeMs"
+ },
+ "tool": {
+ "type": "string"
+ },
+ "truncated": {
+ "type": "boolean"
+ }
+ },
+ "type": "object"
+ },
+ "summary": {
+ "type": "string"
+ }
+ },
+ "type": "object"
+}Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the readOnlyHint and idempotentHint annotations, the description reveals duplicate-name behavior (only the first-added connection of a duplicate name is reachable by name) and explicitly states that no sensitive data is returned (no DSN, no credentials). This adds valuable operational context beyond the annotations.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two sentences with zero wasted words. The core purpose and returned fields are front-loaded in the first sentence, with important caveats (duplicate handling and security) in the second. Structure is optimal.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a zero-parameter read-only list tool, the description covers what it returns, duplicate handling, and the security posture. An output schema exists, but the description already summarizes the returned fields, making it complete for an agent to invoke correctly without further inference.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
There are no parameters (schema is empty), so the description has nothing to add. The baseline of 4 is appropriate because there is no ambiguity to resolve and the schema coverage is trivially 100%.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('List') and resource ('database connection registered for your tenant'), and enumerates the returned fields (name, id, dbType, createdAt). It clearly distinguishes itself from siblings like add_connection or remove_connection by focusing on read-only enumeration.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description clearly states what the tool does, implying it should be used when an agent needs to see registered connections. It does not explicitly name alternatives or exclusions, but the context is unambiguous enough for an agent to select it over test_connection or other siblings. A slight gap is the absence of an explicit 'use when' or 'when not to use' statement.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Add one secure layer between your agents and this server.