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discord-mcp

by cappyeo
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TypeScript
Remote

messages_list_pins

Read-onlyIdempotent

Retrieve pinned messages in a Discord channel to access FAQs, rules, and announcements. Supports pagination with ISO timestamps for complete pin history.

Instructions

Purpose: List the pinned messages in a channel.

When to use:

  • Surface persistent pinned content (FAQs, rules, announcements).

When NOT to use:

  • Reading recent activity → use messages_read.

Pagination: pass before (ISO 8601 timestamp from a prior pinned_at) and limit (1-50). When has_more is true, next_before is the last item's pinned_at for the next page.

Returns: {pins:[{message_id, author_id, author_name, content, timestamp, pinned_at}], has_more, next_before?, count, channel_id}. Structured pin fields remain raw Discord data; the human-readable MCP content response fences message text.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
limitNoMaximum pins to fetch (1-50, default 50)
beforeNoISO 8601 timestamp; return pins created before this
channel_idYesChannel to inspect

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changedv0.28.0
    • changedInput schema / properties / before / pattern
      Previous value: -"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"New value: +"^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$"
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "$schema": "https://json-schema.org/draft/2020-12/schema",
-    "additionalProperties": {},
-    "properties": {
-      "channel_id": {
-        "description": "Discord channel ID (snowflake)",
-        "pattern": "^\\d{17,20}$",
-        "type": "string"
-      },
-      "count": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "has_more": {
-        "type": "boolean"
-      },
-      "next_before": {
-        "format": "date-time",
-        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-        "type": "string"
-      },
-      "pins": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "author_id": {
-              "description": "Discord user ID",
-              "pattern": "^\\d{17,20}$",
-              "type": "string"
-            },
-            "author_name": {
-              "type": "string"
-            },
-            "content": {
-              "type": "string"
-            },
-            "message_id": {
-              "description": "Discord message ID",
-              "pattern": "^\\d{17,20}$",
-              "type": "string"
-            },
-            "pinned_at": {
-              "format": "date-time",
-              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
-              "type": "string"
-            },
-            "timestamp": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "message_id",
-            "author_id",
-            "author_name",
-            "content",
-            "timestamp",
-            "pinned_at"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "pins",
-      "has_more",
-      "count",
-      "channel_id"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "category": {
-        "enum": [
-          "client",
-          "server"
-        ],
-        "type": "string"
-      },
-      "code": {
-        "type": "string"
-      },
-      "recovery_hint": {
-        "type": "string"
-      },
-      "retriable": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "code",
-      "retriable",
-      "category",
-      "recovery_hint"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "additionalProperties": {},
+    "properties": {
+      "channel_id": {
+        "description": "Discord channel ID (snowflake)",
+        "pattern": "^\\d{17,20}$",
+        "type": "string"
+      },
+      "count": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "has_more": {
+        "type": "boolean"
+      },
+      "next_before": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "pins": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "author_id": {
+              "description": "Discord user ID",
+              "pattern": "^\\d{17,20}$",
+              "type": "string"
+            },
+            "author_name": {
+              "type": "string"
+            },
+            "content": {
+              "type": "string"
+            },
+            "message_id": {
+              "description": "Discord message ID",
+              "pattern": "^\\d{17,20}$",
+              "type": "string"
+            },
+            "pinned_at": {
+              "format": "date-time",
+              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d:[0-5]\\d(?:\\.\\d+)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+              "type": "string"
+            },
+            "timestamp": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "message_id",
+            "author_id",
+            "author_name",
+            "content",
+            "timestamp",
+            "pinned_at"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "pins",
+      "has_more",
+      "count",
+      "channel_id"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "category": {
+        "enum": [
+          "client",
+          "server"
+        ],
+        "type": "string"
+      },
+      "code": {
+        "type": "string"
+      },
+      "recovery_hint": {
+        "type": "string"
+      },
+      "retriable": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "code",
+      "retriable",
+      "category",
+      "recovery_hint"
+    ],
+    "type": "object"
+  }
+]
  2. Changed3 schema fields changedv0.26.0
    • addedInput schema / properties / before
      Added value: +{
+  "description": "ISO 8601 timestamp; return pins created before this",
+  "format": "date-time",
+  "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+  "type": "string"
+}
    • addedInput schema / properties / limit
      Added value: +{
+  "default": 50,
+  "description": "Maximum pins to fetch (1-50, default 50)",
+  "maximum": 50,
+  "minimum": 1,
+  "type": "integer"
+}
    • changedOutput schema / anyOf
      Previous value: -[
-  {
-    "$schema": "https://json-schema.org/draft/2020-12/schema",
-    "additionalProperties": {},
-    "properties": {
-      "channel_id": {
-        "description": "Discord channel ID (snowflake)",
-        "pattern": "^\\d{17,20}$",
-        "type": "string"
-      },
-      "count": {
-        "maximum": 9007199254740991,
-        "minimum": -9007199254740991,
-        "type": "integer"
-      },
-      "pins": {
-        "items": {
-          "additionalProperties": false,
-          "properties": {
-            "author_id": {
-              "description": "Discord user ID",
-              "pattern": "^\\d{17,20}$",
-              "type": "string"
-            },
-            "author_name": {
-              "type": "string"
-            },
-            "content": {
-              "type": "string"
-            },
-            "message_id": {
-              "description": "Discord message ID",
-              "pattern": "^\\d{17,20}$",
-              "type": "string"
-            },
-            "timestamp": {
-              "type": "string"
-            }
-          },
-          "required": [
-            "message_id",
-            "author_id",
-            "author_name",
-            "content",
-            "timestamp"
-          ],
-          "type": "object"
-        },
-        "type": "array"
-      }
-    },
-    "required": [
-      "pins",
-      "count",
-      "channel_id"
-    ],
-    "type": "object"
-  },
-  {
-    "properties": {
-      "category": {
-        "enum": [
-          "client",
-          "server"
-        ],
-        "type": "string"
-      },
-      "code": {
-        "type": "string"
-      },
-      "recovery_hint": {
-        "type": "string"
-      },
-      "retriable": {
-        "type": "boolean"
-      }
-    },
-    "required": [
-      "code",
-      "retriable",
-      "category",
-      "recovery_hint"
-    ],
-    "type": "object"
-  }
-]New value: +[
+  {
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "additionalProperties": {},
+    "properties": {
+      "channel_id": {
+        "description": "Discord channel ID (snowflake)",
+        "pattern": "^\\d{17,20}$",
+        "type": "string"
+      },
+      "count": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "has_more": {
+        "type": "boolean"
+      },
+      "next_before": {
+        "format": "date-time",
+        "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+        "type": "string"
+      },
+      "pins": {
+        "items": {
+          "additionalProperties": false,
+          "properties": {
+            "author_id": {
+              "description": "Discord user ID",
+              "pattern": "^\\d{17,20}$",
+              "type": "string"
+            },
+            "author_name": {
+              "type": "string"
+            },
+            "content": {
+              "type": "string"
+            },
+            "message_id": {
+              "description": "Discord message ID",
+              "pattern": "^\\d{17,20}$",
+              "type": "string"
+            },
+            "pinned_at": {
+              "format": "date-time",
+              "pattern": "^(?:(?:\\d\\d[2468][048]|\\d\\d[13579][26]|\\d\\d0[48]|[02468][048]00|[13579][26]00)-02-29|\\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\\d|30)|(?:02)-(?:0[1-9]|1\\d|2[0-8])))T(?:(?:[01]\\d|2[0-3]):[0-5]\\d(?::[0-5]\\d(?:\\.\\d+)?)?(?:Z|([+-](?:[01]\\d|2[0-3]):[0-5]\\d)))$",
+              "type": "string"
+            },
+            "timestamp": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "message_id",
+            "author_id",
+            "author_name",
+            "content",
+            "timestamp",
+            "pinned_at"
+          ],
+          "type": "object"
+        },
+        "type": "array"
+      }
+    },
+    "required": [
+      "pins",
+      "has_more",
+      "count",
+      "channel_id"
+    ],
+    "type": "object"
+  },
+  {
+    "properties": {
+      "category": {
+        "enum": [
+          "client",
+          "server"
+        ],
+        "type": "string"
+      },
+      "code": {
+        "type": "string"
+      },
+      "recovery_hint": {
+        "type": "string"
+      },
+      "retriable": {
+        "type": "boolean"
+      }
+    },
+    "required": [
+      "code",
+      "retriable",
+      "category",
+      "recovery_hint"
+    ],
+    "type": "object"
+  }
+]
  3. First observedv0.22.0

TDQS

A5/5.0
Behavior5/5

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

Annotations already declare readOnlyHint=true and idempotentHint=true, so safety is covered. The description adds valuable pagination behavior (before, limit, has_more, next_before) and clarifies that structured pin fields are raw Discord data while the MCP content fences message text. No contradiction.

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?

Well-structured with clear headers, front-loaded purpose and usage, and compact pagination/returns. Every sentence adds value without redundancy.

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?

Complete for a read-only paginated tool: covers purpose, usage, pagination, and return format. The description itself provides the output structure, and annotations handle safety, so nothing critical is missing.

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

Parameters5/5

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

Schema coverage is 100%, but the description goes beyond the schema by explaining the pagination relationship (before is a timestamp from a prior pinned_at) and how next_before works for the next page. Adds meaning beyond parameter descriptions.

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?

Clearly states it lists pinned messages in a channel with a specific verb and resource. Distinguishes from messages_read by saying it is for persistent content, not recent activity, and names the sibling tool explicitly.

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

Usage Guidelines5/5

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

Provides explicit 'When to use' and 'When NOT to use' sections, naming messages_read as the alternative for recent activity. Gives clear context and a direct exclusion, leaving no ambiguity.

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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