ko-mcp

list_insider_traders

Read-onlyIdempotent

List executives/insiders who have recently traded their company stock. Filter by role (CEO only or all executives). Useful for finding notable insider buying/selling activity across the market.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`page`	No
`role`	No	Filter by role (case-insensitive): CEO, executive/officer, or all	all
`limit`	No
`search`	No	Search by name or ticker

Output Schema

TableJSON Schema

Name	Required	Description
`role`	Yes
`rows`	Yes
`grain`	Yes
`paging`	Yes	Paging state reconciled from ko.io meta.total_count and meta.softwall
`search`	Yes
`plan_limit`	Yes	The Free/keyless plan limits ko.io applied to this answer (null for paid callers)

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedSep 26, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "additionalProperties": false,
+  "properties": {
+    "grain": {
+      "const": "insider_trade_date",
+      "type": "string"
+    },
+    "paging": {
+      "additionalProperties": false,
+      "description": "Paging state reconciled from ko.io meta.total_count and meta.softwall",
+      "properties": {
+        "continuation": {
+          "description": "SIGNIN_REQUIRED = page>1 needs a (free) ko.io API key",
+          "type": [
+            "string",
+            "null"
+          ]
+        },
+        "has_more": {
+          "description": "null = a full page came back and more MAY exist",
+          "type": [
+            "boolean",
+            "null"
+          ]
+        },
+        "next_page": {
+          "anyOf": [
+            {
+              "$ref": "#/properties/rows/items/properties/form4_lines/anyOf/0"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Next page THIS caller can open; null when there is none (or sign-in is required)"
+        },
+        "page": {
+          "type": "integer"
+        },
+        "per_page": {
+          "type": "integer"
+        },
+        "plan_row_cap": {
+          "anyOf": [
+            {
+              "$ref": "#/properties/rows/items/properties/form4_lines/anyOf/0"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Row cap the caller's plan applied to this page, if any"
+        },
+        "returned": {
+          "type": "integer"
+        },
+        "total_count": {
+          "anyOf": [
+            {
+              "$ref": "#/properties/rows/items/properties/form4_lines/anyOf/0"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "description": "Total rows matching the request, when ko.io reported it"
+        },
+        "truncated_by_plan": {
+          "description": "True when the plan's row cap withheld rows from this page",
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "page",
+        "per_page",
+        "returned",
+        "total_count",
+        "has_more",
+        "next_page",
+        "continuation",
+        "plan_row_cap",
+        "truncated_by_plan"
+      ],
+      "type": "object"
+    },
+    "plan_limit": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "continuation": {
+              "$ref": "#/properties/search"
+            },
+            "date_basis": {
+              "$ref": "#/properties/search"
+            },
+            "effective_period": {
+              "$ref": "#/properties/search"
+            },
+            "policy_version": {
+              "$ref": "#/properties/search"
+            },
+            "row_cap": {
+              "$ref": "#/properties/rows/items/properties/form4_lines"
+            },
+            "truncated": {
+              "type": [
+                "boolean",
+                "null"
+              ]
+            },
+            "window_end": {
+              "$ref": "#/properties/search"
+            },
+            "window_start": {
+              "$ref": "#/properties/search"
+            }
+          },
+          "required": [
+            "policy_version",
+            "window_start",
+            "window_end",
+            "effective_period",
+            "date_basis",
+            "row_cap",
+            "truncated",
+            "continuation"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "The Free/keyless plan limits ko.io applied to this answer (null for paid callers)"
+    },
+    "role": {
+      "type": "string"
+    },
+    "rows": {
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "all_value_acquired": {
+            "anyOf": [
+              {
+                "$ref": "#/properties/rows/items/properties/ps_value_bought/anyOf/0"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Exact decimal string as served by ko.io (not rounded); null = unknown"
+          },
+          "all_value_disposed": {
+            "$ref": "#/properties/rows/items/properties/all_value_acquired"
+          },
+          "company_name": {
+            "$ref": "#/properties/search"
+          },
+          "form4_lines": {
+            "anyOf": [
+              {
+                "type": "integer"
+              },
+              {
+                "type": "null"
+              }
+            ]
+          },
+          "officer_title": {
+            "$ref": "#/properties/search"
+          },
+          "person_cik": {
+            "$ref": "#/properties/search"
+          },
+          "person_name": {
+            "$ref": "#/properties/search"
+          },
+          "ps_value_bought": {
+            "anyOf": [
+              {
+                "pattern": "^-?\\d+(\\.\\d+)?([eE][-+]?\\d+)?$",
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Code P lines (open-market or private purchase), priced lines only"
+          },
+          "ps_value_sold": {
+            "anyOf": [
+              {
+                "$ref": "#/properties/rows/items/properties/ps_value_bought/anyOf/0"
+              },
+              {
+                "type": "null"
+              }
+            ],
+            "description": "Code S lines (open-market or private sale), priced lines only"
+          },
+          "shares_owned_after": {
+            "$ref": "#/properties/rows/items/properties/all_value_acquired"
+          },
+          "ticker": {
+            "$ref": "#/properties/search"
+          },
+          "trade_date": {
+            "$ref": "#/properties/search"
+          }
+        },
+        "required": [
+          "ticker",
+          "company_name",
+          "person_cik",
+          "person_name",
+          "officer_title",
+          "trade_date",
+          "form4_lines",
+          "ps_value_bought",
+          "ps_value_sold",
+          "all_value_acquired",
+          "all_value_disposed",
+          "shares_owned_after"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "search": {
+      "type": [
+        "string",
+        "null"
+      ]
+    }
+  },
+  "required": [
+    "search",
+    "role",
+    "grain",
+    "rows",
+    "paging",
+    "plan_limit"
+  ],
+  "type": "object"
+}

First observedJul 11, 2026

TDQS

B3.2/5.0

Behavior3/5

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

Annotations already carry the safety profile (readOnly, idempotent, non-destructive), so the bar is lower. The description adds that it lists recent market-wide insider activity and supports a role filter, but it does not disclose the time window behind 'recently,' sorting/pagination behavior, or any rate limits—minor gaps given 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.

Conciseness4/5

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

Two sentences: first states the action and scope, second notes the role filter and use case. It is front-loaded and free of filler, though 'notable' is vague.

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

Completeness3/5

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

An output schema exists, so return fields don't need describing. The core purpose and filter are present, but the description leaves ambiguity around the recency window and does not mention pagination or how search works, making it only minimally complete for a 4-parameter tool.

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

Parameters2/5

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

Schema description coverage is 50%, with only role and search described; page and limit have no schema descriptions. The description echoes the role values but adds no meaning for page/limit and does not explain search semantics beyond the schema, so it fails to compensate for the coverage gap.

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?

The description states a specific verb+resource: 'List executives/insiders who have recently traded their company stock.' It also mentions market-wide scope, which loosely distinguishes it from sibling get_insider_trades, but it never names an alternative or explicitly contrasts with related tools, so it stops short of a 5.

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?

The description provides a use case ('Useful for finding notable insider buying/selling activity across the market') and mentions the role-based filter, which implies when it is appropriate. However, it does not give explicit when-not-to-use guidance or name alternatives like get_insider_trades for ticker-specific data.

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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