Matt Vollmer
ca879ffae6
Adds three new documentation pages for major shipped features that had no docs, and updates the platform controls index to reflect current state. ## New pages ### Extending Agents (`extending-agents.md`) Covers two workspace-level extension mechanisms: - **Skills** — `.agents/skills/<name>/SKILL.md` directory structure, frontmatter format, auto-discovery, `read_skill`/`read_skill_file` tools, size limits, lazy loading - **Workspace MCP tools** — `.mcp.json` format, stdio and HTTP transports, tool name prefixing, discovery lifecycle and caching ### MCP Servers (`platform-controls/mcp-servers.md`) Admin MCP server configuration: - CRUD via **Agents** > **Settings** > **MCP Servers** - Four auth modes: none, OAuth2 (with auto-discovery), API key, custom headers - Availability policies: `force_on`, `default_on`, `default_off` - Tool governance via allow/deny lists - Permission model and secret redaction ### Usage & Insights (`platform-controls/usage-insights.md`) Three admin dashboards: - **Usage limits** — spend caps with per-user and per-group overrides, priority hierarchy, enforcement behavior - **Cost tracking** — per-user rollup with token breakdowns, date filtering, per-model and per-chat drill-down ## Updated files - **`platform-controls/index.md`** — Moved MCP servers, usage limits, and analytics from "Where we are headed" into "What platform teams control today" with links to the new pages. Removed the tool customization roadmap section (now covered by MCP servers page). - **`manifest.json`** — Added nav entries for all three new pages. ## Resulting nav hierarchy ``` Coder Agents ├── Getting Started ├── Early Access ├── Architecture ├── Models ├── Platform Controls │ ├── Template Optimization │ ├── MCP Servers ← NEW │ └── Usage & Insights ← NEW ├── Extending Agents ← NEW └── Chats API ``` --- *PR generated with Coder Agents*
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MCP Servers
Administrators can register external MCP servers that provide additional tools for agent chat sessions. Configured servers are injected into or offered to users during chat depending on the availability policy.
This is an admin-only feature accessible at Agents > Settings > MCP Servers.
Add an MCP server
- Navigate to Agents > Settings > MCP Servers.
- Click Add.
- Fill in the configuration fields described below.
- Click Save.
Identity
| Field | Required | Description |
|---|---|---|
display_name |
Yes | Human-readable name shown to users in chat. |
slug |
Yes | URL-safe unique identifier, auto-generated from display name. |
description |
No | Brief summary of what the server provides. |
icon_url |
No | Emoji or image URL displayed alongside the server name. |
Connection
| Field | Required | Description |
|---|---|---|
url |
Yes | The MCP server endpoint URL. |
transport |
Yes | Transport protocol. streamable_http or sse. |
Availability
| Field | Required | Description |
|---|---|---|
enabled |
No | Master toggle. Disabled servers are hidden from non-admin users. |
availability |
Yes | Controls how the server appears in chat sessions. See Availability policies. |
model_intent |
No | When enabled, requires the model to describe each tool call's purpose in natural language, shown as a status label in the UI. |
Availability policies
| Policy | Behavior |
|---|---|
force_on |
Always injected into every chat. Users cannot opt out. |
default_on |
Pre-selected in new chats. Users can opt out. |
default_off |
Available in the server list but users must opt in. |
Authentication
Each MCP server uses one of four authentication modes. When you change the auth type, fields from the previous type are automatically cleared.
Secrets are never returned in API responses — boolean flags indicate whether a value is set.
None
No credentials are sent. Use this for servers that do not require authentication.
OAuth2
Per-user authorization. The administrator configures the OAuth2 provider, and each user independently completes the authorization flow.
Manual configuration — provide all three fields together:
| Field | Description |
|---|---|
oauth2_client_id |
OAuth2 client ID. |
oauth2_auth_url |
Authorization endpoint URL. |
oauth2_token_url |
Token endpoint URL. |
Optional fields:
| Field | Description |
|---|---|
oauth2_client_secret |
OAuth2 client secret. |
oauth2_scopes |
Space-separated list of scopes. |
Auto-discovery — leave oauth2_client_id, oauth2_auth_url, and
oauth2_token_url empty. The server attempts discovery in this order:
- RFC 9728 — Protected Resource Metadata
- RFC 8414 — Authorization Server Metadata
- RFC 7591 — Dynamic Client Registration
Users connect through a popup that redirects through the OAuth2 provider. Tokens are stored per-user and refreshed automatically. Users can disconnect via the UI or API to remove stored tokens.
API key
A static key sent as a header on every request.
| Field | Required | Description |
|---|---|---|
api_key_header |
Yes | Header name (e.g., Authorization). |
api_key_value |
Yes | Secret value sent in the header. |
Custom headers
Arbitrary key-value header pairs sent on every request. At least one header is required when this mode is selected.
Tool governance
Control which tools from a server are available in chat:
| Field | Description |
|---|---|
tool_allow_list |
If non-empty, only the listed tool names are exposed. An empty list allows all tools. |
tool_deny_list |
Listed tool names are always blocked, even if they appear in the allow list. |
Permissions
| Action | Required role |
|---|---|
| Create, update, or delete | Admin (deployment config) |
| View enabled servers | Any authenticated user |
| OAuth2 connect and disconnect | Any authenticated user |
Non-admin users only see enabled servers. Sensitive fields such as API keys and client secrets are redacted in API responses.