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List customers

well_list_customers
Read-only

List the customers this workspace bills, companies (B2B) and private individuals (B2C), and the ones it could define as a customer next. Draws the define-customer card, which can also create a new customer of either kind.

Use it when an invoice needs a customer ("who is this invoice for", "bill Acme"). Pass query with the name, e-mail, domain or registered name the user typed. Without query the read proposes the customers the workspace invoiced most recently.

Returns customers (already defined as customers) and candidates (could be). Each row carries customer_kind (the record: "company" for a company, "person" for a private individual; pass it on to well_define_customer, and bill a "person" through the invoice's receiver person_id), entity_kind ("company" or "person"), entity_id, name, provenance, confidence (the share of the workspace's newest issued invoices addressed to the company, null when it has none in that window), definable with definable_reason when it is false, invoices_issued, first_invoiced, people_count, identity (which carries address when the company has one) and other_workspaces (the member's other workspaces that already hold this same company, each with workspace_id, workspace_name and held_as — "customer" or "own_company"; empty when it is held nowhere else).

With a query, query_kind is the kind Well proposes for a customer of that name that does not exist yet: "company" when the text carries a legal form (SAS, SARL, GmbH, Inc...), a SIREN, SIRET or VAT number, or a domain, else "person". The card shows it as a preselected Company / Private individual choice the user can change.

Pass include_external: true with a query when the graph holds no match: registry hits come back as candidates with provenance: "registry", and defining one adds the company to the workspace. Never pick a customer from a name alone; the user chooses on the card, then well_define_customer records the choice.

When the token authorizes one workspace, call this directly — no workspace call is needed first. When it authorizes several, this read will not guess which one you mean: pass workspace_id on the call.

Input Schema

NameRequiredDescriptionDefault
limitNoMax rows per lane (default 25).
queryNoWhat the user typed: a name, a registered name, a trade name or a domain.
workspace_idNoTarget workspace. Omit when the token authorizes one workspace. Required when it authorizes several: this read reports one workspace's own figures and will not choose which.
conversation_idNoThe conversation id returned by the previous Well result, in its meta under well/conversation_id, in its structuredContent, or in its JSON text block. Pass it back on every call in the same conversation, including a call a card makes, so the chosen workspace and the earlier answers still apply. It decides the conversation on its own: nothing the host states about the session replaces it. Omit it only on the first call of a conversation.
workspace_scopeNoRestrict this call to the family: the token's primary workspace plus the company workspaces under it that you are a member of. Unrelated authorized workspaces drop out of the read; row reads merge across the family, while a per-workspace figure still reports exactly one workspace.
include_externalNoAlso search the public company registries. Needs a query of at least 2 characters.

Output Schema

NameRequiredDescriptionDefault
errorNo
successYes
customersYes
candidatesYes
needs_pickNo
query_kindNo
error_reasonNo
own_company_idNo
conversation_idNoThe conversation this result belongs to. Pass it back as the conversation_id argument on every later Well call in the same conversation.
newly_connectedNoTools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. The connected-line rule says when to tell an entry; when it does, one line per entry, in the person's language: "<name> is connected.". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later.
resolved_workspaceNoThe workspace that answered, when the caller named none and the token authorizes several.
conversation_id_noteNoPresent only when the server opened a fresh lane, stating that no choice recorded earlier was read.
conversation_id_sourceNoWhere the conversation id came from: the host's own request meta, the caller's argument, or a fresh lane the server opened.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed25 schema fields changed
    • removedOutput schema / properties / candidates / items / properties / domain / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / candidates / items / properties / domain / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / candidates / items / properties / first_invoiced / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / candidates / items / properties / first_invoiced / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / candidates / items / properties / identity / additionalProperties / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / candidates / items / properties / identity / additionalProperties / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / candidates / items / properties / invoices_issued / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / candidates / items / properties / invoices_issued / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / candidates / items / properties / people_count / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / candidates / items / properties / people_count / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / customers / items / properties / domain / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / customers / items / properties / domain / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / customers / items / properties / first_invoiced / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / customers / items / properties / first_invoiced / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / customers / items / properties / identity / additionalProperties / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / customers / items / properties / identity / additionalProperties / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • removedOutput schema / properties / customers / items / properties / invoices_issued / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / customers / items / properties / invoices_issued / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / customers / items / properties / people_count / anyOf
      Removed value: -[
      -  {
      -    "type": "number"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / customers / items / properties / people_count / type
      Added value: +[
      +  "number",
      +  "null"
      +]
    • removedOutput schema / properties / own_company_id / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / own_company_id / type
      Added value: +[
      +  "string",
      +  "null"
      +]
    • changedOutput schema / properties / query_kind / anyOf
      Previous value: -[
      -  {
      -    "additionalProperties": false,
      -    "properties": {
      -      "evidence": {
      -        "enum": [
      -          "legal_form",
      -          "company_identifier",
      -          "domain",
      -          "none"
      -        ],
      -        "type": "string"
      -      },
      -      "identifier_type": {
      -        "anyOf": [
      -          {
      -            "enum": [
      -              "SIREN",
      -              "SIRET",
      -              "VAT"
      -            ],
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      },
      -      "kind": {
      -        "enum": [
      -          "company",
      -          "person"
      -        ],
      -        "type": "string"
      -      },
      -      "legal_form": {
      -        "anyOf": [
      -          {
      -            "type": "string"
      -          },
      -          {
      -            "type": "null"
      -          }
      -        ]
      -      }
      -    },
      -    "required": [
      -      "kind",
      -      "evidence",
      -      "legal_form",
      -      "identifier_type"
      -    ],
      -    "type": "object"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]New value: +[
      +  {
      +    "additionalProperties": false,
      +    "properties": {
      +      "evidence": {
      +        "enum": [
      +          "legal_form",
      +          "company_identifier",
      +          "domain",
      +          "none"
      +        ],
      +        "type": "string"
      +      },
      +      "identifier_type": {
      +        "anyOf": [
      +          {
      +            "enum": [
      +              "SIREN",
      +              "SIRET",
      +              "VAT"
      +            ],
      +            "type": "string"
      +          },
      +          {
      +            "type": "null"
      +          }
      +        ]
      +      },
      +      "kind": {
      +        "enum": [
      +          "company",
      +          "person"
      +        ],
      +        "type": "string"
      +      },
      +      "legal_form": {
      +        "type": [
      +          "string",
      +          "null"
      +        ]
      +      }
      +    },
      +    "required": [
      +      "kind",
      +      "evidence",
      +      "legal_form",
      +      "identifier_type"
      +    ],
      +    "type": "object"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / resolved_workspace / properties / name / anyOf
      Removed value: -[
      -  {
      -    "type": "string"
      -  },
      -  {
      -    "type": "null"
      -  }
      -]
    • addedOutput schema / properties / resolved_workspace / properties / name / type
      Added value: +[
      +  "string",
      +  "null"
      +]
  2. Changed2 schema fields changed
    • addedOutput schema / properties / own_company_id / anyOf
      Added value: +[
      +  {
      +    "type": "string"
      +  },
      +  {
      +    "type": "null"
      +  }
      +]
    • removedOutput schema / properties / own_company_id / type
      Removed value: -"string"
  3. Changed6 schema fields changed
    • addedOutput schema / properties / candidates / items / properties / customer_kind
      Added value: +{
      +  "enum": [
      +    "company",
      +    "person"
      +  ],
      +  "type": "string"
      +}
    • changedOutput schema / properties / candidates / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "people_count",
      -  "identity",
      -  "other_workspaces"
      -]New value: +[
      +  "customer_kind",
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity",
      +  "other_workspaces"
      +]
    • addedOutput schema / properties / customers / items / properties / customer_kind
      Added value: +{
      +  "enum": [
      +    "company",
      +    "person"
      +  ],
      +  "type": "string"
      +}
    • changedOutput schema / properties / customers / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "people_count",
      -  "identity",
      -  "other_workspaces"
      -]New value: +[
      +  "customer_kind",
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity",
      +  "other_workspaces"
      +]
    • addedOutput schema / properties / needs_pick
      Added value: +{
      +  "type": "boolean"
      +}
    • addedOutput schema / properties / query_kind
      Added value: +{
      +  "anyOf": [
      +    {
      +      "additionalProperties": false,
      +      "properties": {
      +        "evidence": {
      +          "enum": [
      +            "legal_form",
      +            "company_identifier",
      +            "domain",
      +            "none"
      +          ],
      +          "type": "string"
      +        },
      +        "identifier_type": {
      +          "anyOf": [
      +            {
      +              "enum": [
      +                "SIREN",
      +                "SIRET",
      +                "VAT"
      +              ],
      +              "type": "string"
      +            },
      +            {
      +              "type": "null"
      +            }
      +          ]
      +        },
      +        "kind": {
      +          "enum": [
      +            "company",
      +            "person"
      +          ],
      +          "type": "string"
      +        },
      +        "legal_form": {
      +          "anyOf": [
      +            {
      +              "type": "string"
      +            },
      +            {
      +              "type": "null"
      +            }
      +          ]
      +        }
      +      },
      +      "required": [
      +        "kind",
      +        "evidence",
      +        "legal_form",
      +        "identifier_type"
      +      ],
      +      "type": "object"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ]
      +}
  4. Changed4 schema fields changed
    • addedOutput schema / properties / candidates / items / properties / other_workspaces
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "held_as": {
      +        "enum": [
      +          "customer",
      +          "own_company"
      +        ],
      +        "type": "string"
      +      },
      +      "workspace_id": {
      +        "type": "string"
      +      },
      +      "workspace_name": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "workspace_id",
      +      "workspace_name",
      +      "held_as"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
    • changedOutput schema / properties / candidates / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "people_count",
      -  "identity"
      -]New value: +[
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity",
      +  "other_workspaces"
      +]
    • addedOutput schema / properties / customers / items / properties / other_workspaces
      Added value: +{
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "held_as": {
      +        "enum": [
      +          "customer",
      +          "own_company"
      +        ],
      +        "type": "string"
      +      },
      +      "workspace_id": {
      +        "type": "string"
      +      },
      +      "workspace_name": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "workspace_id",
      +      "workspace_name",
      +      "held_as"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
    • changedOutput schema / properties / customers / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "people_count",
      -  "identity"
      -]New value: +[
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity",
      +  "other_workspaces"
      +]
  5. Changed4 schema fields changed
    • addedOutput schema / properties / candidates / items / properties / people_count
      Added value: +{
      +  "anyOf": [
      +    {
      +      "type": "number"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ]
      +}
    • changedOutput schema / properties / candidates / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "identity"
      -]New value: +[
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity"
      +]
    • addedOutput schema / properties / customers / items / properties / people_count
      Added value: +{
      +  "anyOf": [
      +    {
      +      "type": "number"
      +    },
      +    {
      +      "type": "null"
      +    }
      +  ]
      +}
    • changedOutput schema / properties / customers / items / required
      Previous value: -[
      -  "entity_kind",
      -  "entity_id",
      -  "name",
      -  "domain",
      -  "provenance",
      -  "confidence",
      -  "definable",
      -  "definable_reason",
      -  "invoices_issued",
      -  "first_invoiced",
      -  "identity"
      -]New value: +[
      +  "entity_kind",
      +  "entity_id",
      +  "name",
      +  "domain",
      +  "provenance",
      +  "confidence",
      +  "definable",
      +  "definable_reason",
      +  "invoices_issued",
      +  "first_invoiced",
      +  "people_count",
      +  "identity"
      +]
  6. Changed1 schema field changed
    • changedOutput schema / properties / newly_connected / description
      Previous value: -"Tools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. Start the reply with one line per entry, in the person's language: \"<name> is connected.\". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later."New value: +"Tools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. The connected-line rule says when to tell an entry; when it does, one line per entry, in the person's language: \"<name> is connected.\". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later."
  7. Changed1 schema field changed
    • addedInput schema / properties / workspace_scope
      Added value: +{
      +  "description": "Restrict this call to the family: the token's primary workspace plus the company workspaces under it that you are a member of. Unrelated authorized workspaces drop out of the read; row reads merge across the family, while a per-workspace figure still reports exactly one workspace.",
      +  "enum": [
      +    "family"
      +  ],
      +  "type": "string"
      +}
  8. Changed1 schema field changed
    • addedOutput schema / properties / newly_connected
      Added value: +{
      +  "description": "Tools that connected to this workspace since the last result and that no session was told about yet, oldest first. Present only when at least one tool is new. Start the reply with one line per entry, in the person's language: \"<name> is connected.\". Never fold several entries into one sentence. Each entry comes back once, on one result only: never repeat its line later.",
      +  "items": {
      +    "additionalProperties": false,
      +    "properties": {
      +      "name": {
      +        "type": "string"
      +      },
      +      "service_id": {
      +        "type": "string"
      +      }
      +    },
      +    "required": [
      +      "name",
      +      "service_id"
      +    ],
      +    "type": "object"
      +  },
      +  "type": "array"
      +}
  9. Added

TDQS

A4.6/5.0
Behavior5/5

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

Annotations declare readOnlyHint=true but the description discloses that the call draws a card which can create a customer — a nuance beyond the annotation. It also documents default behavior with no `query` (most recently invoiced customers), the registry provenance path, and the preselected query_kind behavior, all of which shape how an agent should call it.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

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

The guidance is front-loaded and useful, but the middle paragraph enumerates a dozen return fields (`provenance`, `confidence`, `definable_reason`, `people_count`, `other_workspaces` and its sub-keys) that the output schema already carries — significant redundancy for a tool whose output schema is present. Trimming that would sharpen the definition considerably.

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?

Covers the calling decision, the query/external-registry path, workspace resolution, and the define-customer follow-up, which is what an agent needs to select and invoke correctly. It over-delivers on return-value detail despite having an output schema, but nothing essential is missing.

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

Parameters4/5

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

Schema coverage is 100%, so baseline is 3. The description still adds meaning the schema lacks: how `query` is derived from what the user typed, that `query_kind` is a proposal inferred from legal forms/SIREN/VAT/domain, and that `include_external` turns registry hits into candidates with `provenance: "registry"`. It does not mention `limit` or `conversation_id`, keeping it below 5.

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?

States a specific verb and resource with scope: customers the workspace bills, both company (B2B) and person (B2C), plus candidates for what could become a customer. It also distinguishes itself from well_define_customer by naming it as the recording step, so an agent can tell the read from the write.

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?

Gives concrete triggers ("who is this invoice for", "bill Acme"), explains what to pass in `query`, when to add `include_external: true`, and when `workspace_id` is required vs. omittable. It also states a hard constraint — never pick a customer from a name alone — with the alternative (user chooses on the card, then `well_define_customer`).

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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