diff --git a/module/move/assistant/design/Commands.md b/module/move/assistant/design/Commands.md
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+# Commands
+
+## Legend
+
+- `<...>` - argument.
+- `<..?>` - optional argument.
+- `<...=...>` - argument with default value.
+- `!` - command requires a set of messages, however that set is hard to encode in CLI.
+
+## OpenAI
+
+### Users
+
+```shell
+assistant openai users list
+assistant openai users modify <id> <role>
+assistant openai users retrieve <id>
+assistant openai users delete <id>
+```
+
+### Projects
+
+```shell
+assistant openai projects list <include_archived=false>
+assistant openai projects create <name>
+assistant openai projects retrieve <id>
+assistant openai projects modify <id> <new_name>
+assistant openai projects archive <id>
+```
+
+### Project users
+
+```shell
+assistant openai project-users list <project_id>
+assistant openai project-users create <project_id> <user_id> <role>
+assistant openai project-users retrieve <project_id> <user_id>
+assistant openai project-users modify <project_id> <user_id> <role>
+assistant openai project-users delete <project_id> <user_id>
+```
+
+### Project API keys
+
+```shell
+assistant openai project-api-keys list <project_id>
+assistant openai project-api-keys retrieve <project_id> <key_id>
+assistant openai project-api-keys delete <project_id> <key_id>
+```
+
+### Assistants
+
+```shell
+assistant openai assistants create <model> <name?> <description?> <instructions?>
+assistant openai assistants list
+assistant openai assistants retrieve <id>
+assistant openai assistants modify <id> <model?> <name?> <description?> <instructions?>
+assistant openai assistants delete <id>
+```
+
+### Threads
+
+```shell
+assistant openai threads create
+assistant openai threads retrieve <id>
+assistant openai threads delete <id>
+```
+
+### Messages
+
+```shell
+assistant openai messages create <thread_id> <role> <content>
+assistant openai messages list <thread_id>
+assistant openai messages retrieve <thread_id> <message_id>
+assistant openai messages modify <thread_id> <message_id>
+assistant openai messages delete <thread_id> <message_id>
+```
+
+### Chat
+
+```shell
+!assistant openai chat create-completion
+```
+
+### Runs
+
+```shell
+assistant openai runs create <thread_id> <assistant_id>
+assistant openai runs list <thread_id>
+assistant openai runs retrieve <thread_id> <run_id>
+assistant openai runs cancel <thread_id> <run_id>
+```
+
+## Anthropic
+
+### Messages
+
+```shell
+!assistant anthropic messages create
+```
+
diff --git a/module/move/assistant/design/Entities.mmd b/module/move/assistant/design/Entities.mmd
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+graph TD
+    subgraph OpenAI
+      U[Users]
+      P[Projects]
+      PAK[Project API keys]
+      A[Assistants]
+      T[Threads]
+      M[Messages]
+      R[Runs]
+
+      P -- has (through Project Users) --> U
+      P -- has --> PAK
+
+      T -- has --> M
+
+      T -- has --> R
+
+      A -. are called in .-> R
+
+      R -. generate .-> M
+    end
diff --git a/module/move/assistant/design/Entities.png b/module/move/assistant/design/Entities.png
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diff --git a/module/move/assistant/design/Scenarios.md b/module/move/assistant/design/Scenarios.md
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+# Scenarios
+
+## OpenAI
+
+### Projects
+
+#### Create and add users to a new project
+
+```shell
+assistant openai projects create 'AnotherAI'
+```
+
+Administrator will receive the project ID (referred as `<project_id>`).
+
+Then, to add users to the projects, administrator should know their IDs (referred as `<user1_id>` and `<user2_id>`).
+
+```shell
+assistant openai project-users create <project_id> <user1_id> owner
+assistant openai project-users create <project_id> <user2_id> member
+```
+
+Now, to check that the list of users is filled correctly, one can use:
+
+```shell
+assistant openai project-users list <project_id>
+```
+
+To list project API keys, one can use:
+
+```shell
+assistant openai project-api-keys list <project_id>
+```
+
+#### Project "rebranding"
+
+Consider situation:
+
+1. Owner of the organization is changed.
+2. New owner decided to rename the project.
+3. Also new owner decided to delete and add new employees to the project.
+
+Changing the organization owner is done like this:
+
+```shell
+assistant openai users modify <new_onwer_id> owner
+assistant openai users modify <old_owner_id> reader
+```
+
+To rename the project and reassign employees, these commands are used:
+
+```shell
+assistant openai projects modify <project_id> 'AnotherAwesomeAI'
+assistant openai project-users delete <project_id> <old_employee_id>
+assistant openai project-users create <project_id> <new_employee_id> member
+```
+
+
+### Assistants
+
+#### Make new assistant
+
+```shell
+assistant openai assistants create gpt-4o-mini CoolBot 'CoolBot is a helpful assistant.' 'You are a helpful assistant.'
+```
+
+This command will return assistant ID.
+
+#### Chat with the assistant
+
+To chat with OpenAI assistant, one should do this:
+
+1. Create a thread. Thread is like a chat.
+2. Write a message in thread (e.g. a question).
+3. Run the assistant in the thread.
+
+```shell
+assistant openai threads create
+```
+
+This command will return the new thread ID (referred as `thread_id`). To call an assistant, you need to know its ID.
+
+```shell
+assistant openai messages create <thread_id> user '2 + 2 = ?'
+assistant openai runs create <thread_id> <assistant_id>
+```