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coder/docs/ai-coder/agents
Matt Vollmer ca879ffae6 docs: add extending-agents, mcp-servers, and usage-insights pages (#23810)
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
```

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*PR generated with Coder Agents*
2026-03-30 12:46:34 -04:00
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