diff --git a/PLAN.md b/PLAN.md
index 6abb280..f65c677 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -13,6 +13,11 @@ Build an OpenClaw plugin that models organization hierarchy and agent identities
 ## 3) Storage Strategy
 - **Structure & identity data**: in-memory + JSON persistence (no memory_store)
 - **Shared memory**: memory_store keyed by scope (`org:{id}`, `dept:{id}`, `team:{id}`)
+- **Filesystem resources** (plugin install dir `~/.openclaw/yonexus`):
+  - `yonexus/organizations/<org-name>/` contains: `teams/`, `docs/`, `notes/`, `knowledge/`, `rules/`
+  - On **create_organization**: create `<org-name>` folder and its subfolders
+  - On **create_team**: create `organizations/<org-name>/teams/<team-name>/` with `agents/`, `docs/`, `notes/`, `knowledge/`, `rules/`
+  - On **assign_identity**: create `organizations/<org-name>/teams/<team-name>/agents/<agent-id>/` with `docs/`, `notes/`, `knowledge/`, `rules/`
 
 ## 4) Permissions Model (B)
 Roles:
@@ -46,11 +51,12 @@ Permission matrix (recommended):
 ```
 
 ## 6) Tool/API Surface (MVP)
+- `create_organization(name)`
 - `create_department(name, orgId)`
 - `create_team(name, deptId)`
 - `register_agent(agentId, name)`
 - `assign_identity(agentId, deptId, teamId, meta)`
-- `set_supervisor(agentId, supervisorId)`
+- `set_supervisor(actor, agentId, supervisorId)`
 - `whoami(agentId)` → identities + supervisor + roles
 - `query_agents(filters, options)` → list; supports `eq | contains | regex`