feat(chatd): add user-level custom prompt for agent chats#22896
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feat(chatd): add user-level custom prompt for agent chats#22896
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Adds a user-level custom prompt option for agent chats. Users can set
a personal prompt that is injected into every chat as a system message,
allowing them to customize the agent's behavior (e.g., preferred
language, coding style, verbosity).
The prompt is stored in the existing user_configs table (no migration
needed) and resolved at runtime so updates take effect immediately on
ongoing chats. It is wrapped in <user-instructions> tags and injected
after workspace instructions, giving it the highest positional weight
among system-level instructions while remaining subordinate to the
base system prompt.
API:
- GET /api/v2/users/{user}/chat-prompt
- PUT /api/v2/users/{user}/chat-prompt
Changes:
- New SQL queries: GetUserChatCustomPrompt, UpdateUserChatCustomPrompt
- SDK types: UserChatCustomPromptResponse, UpdateUserChatCustomPromptRequest
- HTTP handlers with 128 KiB size limit (same as deployment prompt)
- dbauthz: ReadPersonal/UpdatePersonal authorization
- chatd: resolveUserPrompt() injected in both runChat and ReloadMessages
Contributor
Documentation CheckUpdates Needed
Automated review via Coder Tasks |
Move the user-level custom prompt endpoints from /api/v2/users/{user}/
to /api/experimental/chats/config/ alongside other chat configuration:
- GET /api/experimental/chats/config/user-prompt
- PUT /api/experimental/chats/config/user-prompt
Changes:
- Handlers moved from coderd/users.go to coderd/chats.go
- Use httpmw.APIKey(r).UserID instead of httpmw.UserParam(r)
- SDK types + client methods moved from codersdk/users.go to
codersdk/chats.go
- Routes registered under /chats/config alongside system-prompt
- Swagger annotations removed (experimental endpoints are hidden
from docs gen)
hugodutka
approved these changes
Mar 10, 2026
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Adds a user-level custom prompt to the database.
I'll be doing a follow-up for the UI, as we currently do not have user-level settings (it's just admin). I'll also make it very obvious for chats where there is a user-level prompt, but I don't know how yet.