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whatsmcp

by com.whatsmcp
OverviewDiscussionsAdmin

Follow Channel

wa_follow_channel

Follow a WhatsApp Channel from one of your accounts using its link.

Input Schema

NameRequiredDescriptionDefault
account_idYesthe account to follow from, as returned by wa_list_accounts
channel_linkYesthe channel link (https://whatsapp.com/channel/…) or bare invite key

Output Schema

NameRequiredDescriptionDefault
itemsNothe rows of a list operation
statusYesok (the operation succeeded) or refused (see refusal; for wa_update_group, applied lists the changes that took effect before it)
appliedNowa_update_group only: the settings that were changed, in order — on a refusal, the ones that took effect before it
refusalNopresent only when status is refused
summaryNoa human-readable result
group_jidNothe new group's JID (wa_create_group only) — use it as wa_send_message's 'to'
invite_linkNothe group's invite link (wa_create_group or wa_get_group_invite_link)

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changed
    • changedOutput schema / properties / refusal / properties / account_status / description
      Previous value: -"when the number is not working: its status — starting, not_running, whatsapp_down, suspended, pairing, unlinked or locked"New value: +"when the number is not working: its status — starting, not_running, whatsapp_down (telegram_down for a Telegram account), suspended, pairing, unlinked or locked"
  2. Changed1 schema field changed
    • addedOutput schema / properties / refusal / properties / candidates
      Added value: +{
+  "description": "on an account_ambiguous refusal: the accounts to choose from — retry with one of these as account_id",
+  "items": {
+    "additionalProperties": false,
+    "properties": {
+      "account_id": {
+        "description": "the id to retry with as account_id",
+        "type": "string"
+      },
+      "name": {
+        "description": "the account's WhatsApp display name",
+        "type": "string"
+      },
+      "phone": {
+        "description": "the account's phone number, E.164",
+        "type": "string"
+      },
+      "status": {
+        "description": "whether the number works right now — live, connecting, or why not, as wa_list_accounts reports it",
+        "type": "string"
+      }
+    },
+    "required": [
+      "account_id"
+    ],
+    "type": "object"
+  },
+  "type": [
+    "null",
+    "array"
+  ]
+}
  3. Changed3 schema fields changed
    • addedOutput schema / properties / refusal / properties / account_status
      Added value: +{
+  "description": "when the number is not working: its status — starting, not_running, whatsapp_down, suspended, pairing, unlinked or locked",
+  "type": "string"
+}
    • addedOutput schema / properties / refusal / properties / account_status_reason
      Added value: +{
+  "description": "the detail of account_status, e.g. no_egress, stopped, no_plan",
+  "type": "string"
+}
    • addedOutput schema / properties / refusal / properties / since
      Added value: +{
+  "description": "when the number stopped working, RFC3339, when known",
+  "type": "string"
+}
  4. First observed

TDQS

B3.4/5.0
Behavior3/5

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

Annotations already declare readOnlyHint=false, idempotentHint=false, and destructiveHint=false, so the mutation profile is covered. The description adds only that it is account-scoped and link-driven, but says nothing about the practical consequence of the non-idempotent flag (what happens on a repeat follow) or any rate limits.

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?

A single front-loaded sentence with no filler and the action stated first. The phrase "from one of your accounts" slightly duplicates the account_id parameter, but overall it is tightly scoped.

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 values need no explanation, and the two parameters are fully documented. What is missing for a non-idempotent mutation is the expected outcome when the follow is repeated or fails, which an agent would need before invoking.

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 both parameters explain themselves, including the accepted link format and the cross-reference to wa_list_accounts. The description adds no meaning beyond that, so the baseline of 3 applies.

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?

States a specific verb (Follow) and resource (WhatsApp Channel) plus the key input (its link), so an agent can distinguish it from wa_join_group or wa_list_channels. It stops short of explicitly naming those siblings, which keeps it from 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?

"from one of your accounts using its link" implies the prerequisites, but the description never states when to use this versus wa_list_channels or wa_join_group, nor what to do if the channel is already followed. Usage is implied rather than guided.

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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