diff --git a/README.md b/README.md
index fa613a0..0741a10 100644
--- a/README.md
+++ b/README.md
@@ -156,7 +156,7 @@ After installing, use these directly in your AI agent with `/` commands.
 | `/iblai-api-inference` | Run inference via the OpenAI-compatible API — POST OpenAI-format messages to any `provider/model` (e.g. `openai/gpt-5`) for a completion, SSE stream, or tool calls; list models. Direct REST, no agent needed. |
 | `/iblai-api-agent-session` | Talk to a deployed agent directly over REST/SSE (or WebSocket) and manage chat sessions — POST a prompt with attached metadata (`client_context`), list/read sessions and history exports. Direct-transport counterpart to `agent-chat`. |
 | `/iblai-api-agent-support` | Human-support tickets escalated from agent chats — list/filter tickets, read the reply thread, respond, change status, close or delete |
-| `/iblai-api-org` | Org-wide settings — default agent, help center URL, chat width, feature toggles |
+| `/iblai-api-org` | Org-wide settings — default agent, help center URL, chat width, feature toggles; custom domains (attach a hostname, point it at an SPA, soft/hard delete) |
 | `/iblai-api-management` | Org admin — Users, Groups, Roles, Policies, Teams, Alerts |
 | `/iblai-api-rbac` | RBAC — roles, policies, groups, permission checks, agent/team sharing, student toggles |
 | `/iblai-api-crm` | CRM — people, organizations, pipelines, deals (move/won/lost), activities, tags |
diff --git a/skills/iblai-api-org/SKILL.md b/skills/iblai-api-org/SKILL.md
index 6bfc857..e776002 100644
--- a/skills/iblai-api-org/SKILL.md
+++ b/skills/iblai-api-org/SKILL.md
@@ -1,13 +1,18 @@
 ---
 name: iblai-api-org
-description: Read and write an ibl.ai organization's org-wide settings via the platform API — the org metadata object holding Default Agent, Help Center URL, Chat Area Width, and feature toggles (Help/Accessibility menus, Community Agents, Report Inappropriate Content). Use when configuring org-wide behavior.
+description: Read and write an ibl.ai organization's org-wide settings via the platform API — the org metadata object holding Default Agent, Help Center URL, Chat Area Width, and feature toggles (Help/Accessibility menus, Community Agents, Report Inappropriate Content) — plus the org's custom domains (list, create, point a domain at an SPA, soft-delete/restore, hard delete). Use when configuring org-wide behavior or wiring a vanity domain to an org.
 ---
 
 # iblai-api-org
 
-Read and write an organization's org-wide settings from the API: settings that
-all live inside one org **metadata** object — Default Agent, Help Center URL,
-Chat Area Width, and the feature toggles. Use when configuring org-wide behavior.
+Read and write an organization's org-wide settings from the API. Two surfaces:
+
+- **Org settings** — Default Agent, Help Center URL, Chat Area Width, and the
+  feature toggles. These all live inside one **metadata** object.
+- **Custom domains** — the vanity hostnames pointed at this org, and which SPA
+  each one serves.
+
+Use when configuring org-wide behavior or attaching a domain to an org.
 
 ## Auth & conventions
 
@@ -18,16 +23,52 @@ Chat Area Width, and the feature toggles. Use when configuring org-wide behavior
   setting you **GET** the whole object, **merge** your changed key into it, and
   **PUT** the whole object back. Never drop existing keys — anything you omit is
   lost.
+- **Custom domains take the org key as a `platform_key` query/body field**, not
+  as a path segment — the value is still `$IBLAI_ORG`.
 - Not connected yet? Run **`/iblai-api-login`** first to populate `IBLAI_ORG`,
   `IBLAI_USERNAME`, and `IBLAI_API_KEY`.
+- Deleting a custom domain is destructive and outward-facing — **confirm with
+  the user first.**
+
+## Concepts — custom domains
+
+A custom domain row binds one hostname to one org **and one SPA**. `spa` is a
+fixed enum — `auth` · `skillsai` · `mentorai` · `analyticsai` (wire values, kept
+verbatim) — defaulting to `auth`. One hostname maps to exactly one SPA, so
+serving several apps on vanity domains means several rows.
+
+Two deletes exist and they are not the same:
+
+- **Soft delete** flips `is_deleted`, hiding the domain from the default listing
+  while keeping the row. It is reversible — send `is_deleted: false` to restore.
+- **Hard delete** removes the row permanently. Not reversible.
+
+`registered_with_dns_pro` is **not writable**. DNS/SSL provisioning is driven by
+a backend signal after the row is created; the flag reports that outcome and the
+`instructions` field carries the DNS setup steps to hand the operator. Creating a
+domain does not make it resolve — DNS still has to be pointed.
 
 ## Reads
 
+### Org settings
+
 - **GET** `https://api.iblai.app/dm/api/core/orgs/{org}/metadata/` — read all org settings.
 - **GET** `https://api.iblai.app/dm/api/search/orgs/{org}/users/{username}/mentors/` — source of valid Default Agent values.
 
+### Custom domains
+
+- **GET** `https://api.iblai.app/dm/api/custom-domains/?platform_key={org}` — list this org's domains. **Public endpoint — no auth required.** You must pass **either** `platform_key` **or** `domain` (a bare hostname lookup); sending neither is a `400`. Optional filters:
+  - `?include_deleted=true` — include soft-deleted rows (default excludes them).
+  - `?status=` — filter on DNS registration: `true` / `1` / `active` / `registered`, or `false` / `0` / `inactive` / `unregistered`.
+
+  Returns `{"custom_domains": [...], "count": n}`, or an empty object `{}` when the org has none — **not** a `404`. An unknown `platform_key` *is* a `404`.
+
+  Each domain object: `id`, `custom_domain`, `spa`, `spa_display`, `registered_with_dns_pro`, `dns_pro_display`, `instructions`, `is_deleted`, `platform_id`, `platform_key`, `platform_name`, `platform_metadata`, `created_at`, `updated_at`.
+
 ## Writes
 
+### Org settings
+
 - **PUT** `https://api.iblai.app/dm/api/core/orgs/{org}/metadata/` — save settings (send the whole object back with your key merged in):
   ```json
   {
@@ -44,6 +85,25 @@ Chat Area Width, and the feature toggles. Use when configuring org-wide behavior
     **Community Agents** / **Report Inappropriate Content** → boolean, keyed by
     the metadata-catalog slug assigned at runtime.
 
+### Custom domains
+
+- **POST** `https://api.iblai.app/dm/api/custom-domains/create/` — attach a domain to the org. Requires org admin.
+  ```json
+  {
+    "platform_key": "$IBLAI_ORG",
+    "custom_domain": "learn.example.com",
+    "spa": "mentorai"
+  }
+  ```
+  - `platform_key` and `custom_domain` **required** — omitting either is a `400`.
+  - `spa` optional, defaults to `auth`; an unrecognized value is a `400` listing the valid choices.
+  - `is_deleted` optional (create pre-soft-deleted; rarely useful).
+  - `201` → `{"message": …, "custom_domain": {…}}`. A hostname already in use anywhere on the platform is a `400` ("Domain already exists") — hostnames are globally unique, not per-org.
+- **PUT** `…/custom-domains/{domain_id}/status/` — repoint an existing domain at a different SPA: `{"spa": "skillsai"}`. `spa` is required; invalid values are `400`, unknown `domain_id` is `404`.
+- **PUT** `…/custom-domains/by-name/{domain_name}/status/` — the same change addressed by hostname instead of id, for when you know the domain but not its row id. Requires org admin.
+- **POST** `…/custom-domains/{domain_id}/deleted-status/` — soft delete or restore: `{"is_deleted": true}` hides it, `{"is_deleted": false}` brings it back. The field is required; omitting it is a `400`. **Confirm with the user first.**
+- **DELETE** `…/custom-domains/{domain_id}/delete/` — **hard** delete, permanent and irreversible. Returns the deleted row for the record. Prefer the soft delete above unless the user explicitly wants the row gone. **Confirm with the user first.**
+
 ## Example
 
 Set the Help Center URL while preserving every other key — read first, merge,
@@ -62,6 +122,19 @@ curl -X PUT \
   -d '{"metadata": {"…existing keys preserved…": "...", "help_center_url": "https://help.example.com"}}'
 ```
 
+Point a vanity domain at the agent SPA, then read back the DNS instructions:
+
+```bash
+# 1. attach the domain to this org
+curl -X POST "https://api.iblai.app/dm/api/custom-domains/create/" \
+  -H "Authorization: Api-Token $IBLAI_API_KEY" \
+  -H "Content-Type: application/json" \
+  -d "{\"platform_key\":\"$IBLAI_ORG\",\"custom_domain\":\"learn.example.com\",\"spa\":\"mentorai\"}"
+
+# 2. list the org's domains and read `instructions` for the DNS records to set
+curl -s "https://api.iblai.app/dm/api/custom-domains/?platform_key=$IBLAI_ORG"
+```
+
 ## Notes
 
 - The PUT replaces the metadata object — always GET first, merge your one key,
@@ -72,3 +145,13 @@ curl -X PUT \
   Community Agents, Report Inappropriate Content) are slugs assigned by the
   metadata catalog at runtime — read them off the GET response rather than
   hardcoding.
+- **Custom-domain reads are public; writes are not.** The list endpoint takes no
+  auth at all, so it is safe to call before `/iblai-api-login`. Every write needs
+  an admin token.
+- **An empty list comes back as `{}`, not `{"custom_domains": [], "count": 0}`** —
+  read defensively rather than indexing straight into `custom_domains`.
+- **Hostnames are globally unique.** "Domain already exists" on create can mean
+  another org holds it, not just this one — the error does not distinguish.
+- **Creating a row does not provision DNS or TLS.** That happens asynchronously
+  after create; poll `registered_with_dns_pro` (via the list endpoint) to see
+  whether it landed, and hand `instructions` to whoever controls the zone.