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List UK company directors from the Companies House officers register

company_uk_directors
Read-onlyIdempotent

Directors of a UK company from the Companies House officers register — the register of directors, secretaries and LLP members — including corporate and nominee directors, with appointment and resignation dates, nationality, country of residence, occupation, month/year of birth and correspondence address. Use when: Identify who is legally responsible for a UK company - the directors on the Companies House officers register. Not for: You need beneficial owners / persons with significant control — use company.uk.owners. Price: USD 0.005/call (x402), 0.004 (account key).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
roleNoWhich appointments to return. Default `director` — the capability's name is its contract. The register encodes the office in officer_role, so the filter is a substring test on it: `director` matches director, corporate-director, nominee-director and corporate-nominee-director; `secretary` matches secretary, corporate-secretary, nominee-secretary and corporate-nominee-secretary; `llp_member` matches llp-member, llp-designated-member and their corporate- forms; `all` returns every appointment the register lists, including managing officers, general partners, judicial factors and the EEIG/SE organ roles. Filtering is applied after the register read, so read page.has_more rather than items.length.
limitNoMaximum officers to return per page (1-100). Default 5. Eckari reads up to three register pages of 100 entries to fill this after the role and resigned filters are applied; if the limit is still unmet, page.has_more is true and page.next_offset says where to resume.
offsetNoZero-based index into the register's own officer list (not into the filtered result). Pass back page.next_offset from the previous response to page.
company_numberYesCompanies House company number, also called the company registration number (CRN). Accepted shapes are the register's own — 1-8 digits (zero-padded to 8, e.g. 445790 → 00445790), one letter + 7 digits (R0000001), two letters + 6 digits (SC002180, NI000001, OC123456, OE000001), or the registered-society suffix forms (two letters + 5 digits + 1 letter; two letters + 4 digits + 2 letters). Case-insensitive; surrounding whitespace is ignored (which is why maxLength is 10); internal spaces and punctuation are not accepted. Any other value (for example PROBE) is rejected as INVALID_INPUT before payment and before any upstream call.
include_resignedNoInclude resigned officers. Default false.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
dataYesCapability output; full JSON Schema at https://api.eckari.com/v1/capabilities/company.uk.directors
metaYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed2 schema fields changed
    • changedInput schema / properties / company_number / description
      Previous value: -"Companies House company number, also called the company registration number (CRN). The identifier itself is 1-8 letters/digits; surrounding whitespace is ignored (which is why maxLength is 10), but the value must not contain internal spaces. Short numeric values are zero-padded to 8 characters. A whitespace-only or over-long value is rejected as INVALID_INPUT before any payment or upstream call."New value: +"Companies House company number, also called the company registration number (CRN). Accepted shapes are the register's own — 1-8 digits (zero-padded to 8, e.g. 445790 → 00445790), one letter + 7 digits (R0000001), two letters + 6 digits (SC002180, NI000001, OC123456, OE000001), or the registered-society suffix forms (two letters + 5 digits + 1 letter; two letters + 4 digits + 2 letters). Case-insensitive; surrounding whitespace is ignored (which is why maxLength is 10); internal spaces and punctuation are not accepted. Any other value (for example PROBE) is rejected as INVALID_INPUT before payment and before any upstream call."
    • changedInput schema / properties / company_number / pattern
      Previous value: -"^\\s*[A-Za-z0-9]{1,8}\\s*$"New value: +"^\\s*(?:[0-9]{1,8}|[A-Za-z][0-9]{7}|[A-Za-z]{2}[0-9]{6}|[A-Za-z]{2}[0-9]{5}[A-Za-z]|[A-Za-z]{2}[0-9]{4}[A-Za-z]{2})\\s*$"
  2. Changed3 schema fields changed
    • removedInput schema / properties / companyNumber
      Removed value: -{
      -  "description": "Companies House company number, also called the company registration number (CRN). The identifier itself is 1-8 letters/digits; surrounding whitespace is ignored (which is why maxLength is 10), but the value must not contain internal spaces. Short numeric values are zero-padded to 8 characters. A whitespace-only or over-long value is rejected as INVALID_INPUT before any payment or upstream call.",
      -  "maxLength": 10,
      -  "minLength": 1,
      -  "pattern": "^\\s*[A-Za-z0-9]{1,8}\\s*$",
      -  "type": "string"
      -}
    • addedInput schema / properties / company_number
      Added value: +{
      +  "description": "Companies House company number, also called the company registration number (CRN). The identifier itself is 1-8 letters/digits; surrounding whitespace is ignored (which is why maxLength is 10), but the value must not contain internal spaces. Short numeric values are zero-padded to 8 characters. A whitespace-only or over-long value is rejected as INVALID_INPUT before any payment or upstream call.",
      +  "maxLength": 10,
      +  "minLength": 1,
      +  "pattern": "^\\s*[A-Za-z0-9]{1,8}\\s*$",
      +  "type": "string"
      +}
    • changedInput schema / required
      Previous value: -[
      -  "companyNumber"
      -]New value: +[
      +  "company_number"
      +]
  3. Changed10 schema fields changed
    • changedInput schema / properties / limit / description
      Previous value: -"Maximum officers to return per page (1-100). Default 35. Eckari reads up to three register pages of 100 entries to fill this after the resigned filter is applied; if the limit is still unmet, has_more is true and next_offset says where to resume."New value: +"Maximum officers to return per page (1-100). Default 5. Eckari reads up to three register pages of 100 entries to fill this after the role and resigned filters are applied; if the limit is still unmet, page.has_more is true and page.next_offset says where to resume."
    • changedInput schema / properties / offset / description
      Previous value: -"Zero-based index into the register's own officer list (not into the filtered result). Pass back the next_offset from the previous response to page."New value: +"Zero-based index into the register's own officer list (not into the filtered result). Pass back page.next_offset from the previous response to page."
    • addedInput schema / properties / role
      Added value: +{
      +  "description": "Which appointments to return. Default `director` — the capability's name is its contract. The register encodes the office in officer_role, so the filter is a substring test on it: `director` matches director, corporate-director, nominee-director and corporate-nominee-director; `secretary` matches secretary, corporate-secretary, nominee-secretary and corporate-nominee-secretary; `llp_member` matches llp-member, llp-designated-member and their corporate- forms; `all` returns every appointment the register lists, including managing officers, general partners, judicial factors and the EEIG/SE organ roles. Filtering is applied after the register read, so read page.has_more rather than items.length.",
      +  "enum": [
      +    "director",
      +    "secretary",
      +    "llp_member",
      +    "all"
      +  ],
      +  "type": "string"
      +}
    • removedOutput schema / properties / data / additionalProperties
      Removed value: -false
    • changedOutput schema / properties / data / description
      Previous value: -"Contains public sector information licensed under the Open Government Licence v3.0 (Companies House)."New value: +"Capability output; full JSON Schema at https://api.eckari.com/v1/capabilities/company.uk.directors"
    • removedOutput schema / properties / data / properties
      Removed value: -{
      -  "active_count": {
      -    "description": "Register-wide count of officers in the register's active bucket. Not a count of the returned page, and not simply 'entries without a resignation date': when a company is dissolved or closed the register moves its serving officers into inactive_count and active_count becomes 0.",
      -    "type": "integer"
      -  },
      -  "company_number": {
      -    "type": "string"
      -  },
      -  "has_more": {
      -    "description": "Derived; true when officers matching the current filter remain beyond this page — either because more matches were read than limit allows, or because the register list was not exhausted within the three-page read budget. officers.length < limit is NOT a valid end-of-list test, and neither is comparing against total_officers or active_count, which are register-wide.",
      -    "type": "boolean"
      -  },
      -  "inactive_count": {
      -    "description": "Register-wide count of officers in the register's third bucket — appointments that ended with the company rather than by resignation, which is where the officers of a dissolved or closed company are counted. Null when the register omits the member. Not a count of the returned page.",
      -    "type": [
      -      "integer",
      -      "null"
      -    ]
      -  },
      -  "next_offset": {
      -    "description": "Derived; the offset to pass to the next request to continue after the last officer returned. Null when has_more is false.",
      -    "type": [
      -      "integer",
      -      "null"
      -    ]
      -  },
      -  "officers": {
      -    "description": "Officer entries in the register's own order. Resigned entries are omitted unless include_resigned is true; inactive entries (a dissolved company's officers) are always returned, because the register does not treat them as resigned.",
      -    "items": {
      -      "additionalProperties": false,
      -      "properties": {
      -        "address": {
      -          "additionalProperties": false,
      -          "properties": {
      -            "address_line_1": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "address_line_2": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "care_of": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "country": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "locality": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "po_box": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "postal_code": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "premises": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "region": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            }
      -          },
      -          "type": [
      -            "object",
      -            "null"
      -          ]
      -        },
      -        "appointed_on": {
      -          "format": "date",
      -          "type": [
      -            "string",
      -            "null"
      -          ]
      -        },
      -        "country_of_residence": {
      -          "type": [
      -            "string",
      -            "null"
      -          ]
      -        },
      -        "date_of_birth": {
      -          "additionalProperties": false,
      -          "description": "Month and year only, as published on the public register.",
      -          "properties": {
      -            "month": {
      -              "type": "integer"
      -            },
      -            "year": {
      -              "type": "integer"
      -            }
      -          },
      -          "required": [
      -            "month",
      -            "year"
      -          ],
      -          "type": [
      -            "object",
      -            "null"
      -          ]
      -        },
      -        "identification": {
      -          "additionalProperties": false,
      -          "description": "Corporate officer identification where the officer is a corporate body.",
      -          "properties": {
      -            "identification_type": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "legal_authority": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "legal_form": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "place_registered": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            },
      -            "registration_number": {
      -              "type": [
      -                "string",
      -                "null"
      -              ]
      -            }
      -          },
      -          "type": [
      -            "object",
      -            "null"
      -          ]
      -        },
      -        "is_active": {
      -          "description": "Derived; true exactly when officer_status is active. It is NOT 'no resignation date recorded': an officer of a dissolved company has no resignation date and is not active.",
      -          "type": "boolean"
      -        },
      -        "name": {
      -          "description": "Officer name as registered (surname-first for natural persons).",
      -          "type": "string"
      -        },
      -        "nationality": {
      -          "type": [
      -            "string",
      -            "null"
      -          ]
      -        },
      -        "occupation": {
      -          "type": [
      -            "string",
      -            "null"
      -          ]
      -        },
      -        "officer_status": {
      -          "description": "Derived from the register's own three officer buckets: resigned when the entry carries a resignation date; inactive when it does not but the register reports no active officers and a non-zero inactive_count (the appointment ended with a dissolved or closed company); otherwise active. It describes the register entry, not the company — check company.uk.status for the company's own state.",
      -          "enum": [
      -            "active",
      -            "resigned",
      -            "inactive"
      -          ],
      -          "type": "string"
      -        },
      -        "resigned_on": {
      -          "format": "date",
      -          "type": [
      -            "string",
      -            "null"
      -          ]
      -        },
      -        "role": {
      -          "corporate-director).": null,
      -          "description": "Companies House officer_role (e.g. director",
      -          "llp-member": null,
      -          "secretary": null,
      -          "type": "string"
      -        }
      -      },
      -      "required": [
      -        "name",
      -        "role",
      -        "officer_status",
      -        "is_active",
      -        "appointed_on",
      -        "resigned_on"
      -      ],
      -      "type": "object"
      -    },
      -    "type": "array"
      -  },
      -  "offset": {
      -    "description": "The register index this page started at (the requested offset).",
      -    "type": "integer"
      -  },
      -  "resigned_count": {
      -    "description": "Register-wide count of resigned officers. Not a count of the returned page.",
      -    "type": "integer"
      -  },
      -  "total_officers": {
      -    "description": "Total officer entries on the register for this company (active + inactive + resigned). Register-wide",
      -    "not a count of the returned page.": null,
      -    "type": "integer"
      -  }
      -}
    • removedOutput schema / properties / data / required
      Removed value: -[
      -  "company_number",
      -  "total_officers",
      -  "active_count",
      -  "inactive_count",
      -  "resigned_count",
      -  "offset",
      -  "officers",
      -  "has_more",
      -  "next_offset"
      -]
    • addedOutput schema / properties / meta / properties / attribution_url
      Added value: +{
      +  "format": "uri",
      +  "type": "string"
      +}
    • addedOutput schema / properties / meta / properties / retrieved_at / format
      Added value: +"date-time"
    • addedOutput schema / properties / meta / required
      Added value: +[
      +  "capability",
      +  "version",
      +  "retrieved_at",
      +  "source",
      +  "freshness",
      +  "request_id"
      +]
  4. First observed

TDQS

A4.7/5.0
Behavior5/5

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

Annotations already declare readOnly, idempotent, and non-destructive behavior, yet the description still adds valuable traits: it discloses the per-call price (USD 0.005/call), an operational cost an agent cannot infer from structured metadata, and scopes exactly what the register covers (directors, secretaries, LLP members, corporate and nominee forms). The schema parameter notes further disclose filter-after-read and three-page pagination mechanics. No contradiction with annotations.

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?

The description is dense but every clause earns its place: core purpose, register scope, included fields, when-to-use, not-for routing, and price. It is front-loaded with the primary purpose before any qualification, and the dash structure keeps the multi-part sentence scannable. There is no filler or repetition of the title.

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?

Given the tool's complexity (5 params, abstract pagination, substring filters), the division of labor is ideal: the description handles purpose, scope, use-cases, exclusions, and cost, while the schema's exhaustive property descriptions cover parameter mechanics and the output schema covers return structure. Annotations cover safety and data openness. Nothing an agent needs to call this tool correctly is missing.

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's own property descriptions are exceptionally rich (company_number accepted shapes, role substring-matching semantics, offset meaning). The main description adds no direct parameter guidance beyond mentioning the register scope and corporate/nominee categories, which loosely maps to the role enum. Per the rubric, baseline 3 is correct when the schema does the heavy lifting.

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 states a specific verb and resource — retrieving directors from the Companies House officers register — and enumerates the exact data fields returned (appointment/resignation dates, nationality, occupation, birth month/year, correspondence address). It explicitly differentiates from the most confusable sibling by naming company.uk.owners as the destination for beneficial-owner lookups, so an agent can distinguish it without opening other schemas.

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?

"Use when: Identify who is legally responsible for a UK company" gives an explicit triggering condition, while "Not for: You need beneficial owners / persons with significant control — use company.uk.owners" supplies an explicit exclusion and the named alternative. This is the ideal when/when-not/alternatives pattern; nothing is left to inference.

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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