Well

List expense groups

well_list_expense_groups

Read-only

List the shared-expense groups of this workspace: groups of people who split what they paid (a dinner, a trip, a flat share). It writes nothing.

It returns the 50 newest groups, each with expense_group_id, name, currency (a group holds one currency), member_count and created_by_person_id (the member who created it). An empty list means this workspace has no group yet.

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

Name	Required	Description
`workspace_id`	No	Target 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_id`	No	The 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_scope`	No	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.

Output Schema

Name	Required	Description
`error`	No
`success`	Yes
`expense_groups`	No
`conversation_id`	No	The conversation this result belongs to. Pass it back as the conversation_id argument on every later Well call in the same conversation.
`newly_connected`	No	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.
`resolved_workspace`	No	The workspace that answered, when the caller named none and the token authorizes several.
`conversation_id_note`	No	Present only when the server opened a fresh lane, stating that no choice recorded earlier was read.
`conversation_id_source`	No	Where 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.

Changed4 schema fields changedOct 28, 2026
- removedOutput schema / properties / expense_groups / items / properties / closed_at / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / expense_groups / items / properties / closed_at / type
```
Added value: +[
+  "string",
+  "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"
+]
```
AddedOct 14, 2026

TDQS

A4.2/5.0

Behavior4/5

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

Annotations already declare readOnlyHint/destructiveHint=false, and the description reinforces this with 'It writes nothing.' It adds genuinely new behavioral context beyond the schema: the read is capped at the 50 newest groups and an empty list means no groups exist yet.

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?

Three short paragraphs, front-loaded with purpose before return shape and routing rules. Slightly more text than strictly necessary since the enumerated return fields partly duplicate the output schema, but nothing is wasted outright.

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 an output schema exists, the description covers the remaining gaps: scope, the 50-item cap and ordering, empty-result meaning, and multi-workspace disambiguation. An agent can call this correctly without further inference.

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 coverage is 100% and the parameter descriptions are already very detailed, so the baseline is 3. The description restates the workspace_id rule but adds only a modest nuance ('no workspace call is needed first') and says nothing additional about conversation_id or workspace_scope.

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 (list shared-expense groups of this workspace) and defines the concept with concrete examples (a dinner, a trip, a flat share), which clearly separates it from write siblings like well_create_expense_group and from well_get_expense_group_balances.

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

Usage Guidelines4/5

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

Gives explicit conditional routing: call directly when the token authorizes one workspace, pass workspace_id when it authorizes several. It does not name alternative siblings for related read needs (e.g. balances), so it stops short of full alternative guidance.

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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