## Summary
Phase 2 of the H1 → front-matter migration (`DOCS-483`; parent
`DOCS-477`). Makes the two reference-doc generators emit per-page
metadata as YAML front matter instead of a leading `# H1`, so generated
pages are self-describing and `make gen` stops reverting migrated pages
(Phase 3).
Phase 1 (`DOCS-482`) made the coder.com renderers prefer a front-matter
`title` (manifest fallback).
> [!NOTE]
> Rebased onto `main` and fully regenerated, and updated across two
rounds of Coder Agents Review — see **Review follow-ups** below.
## Changes
- **`scripts/clidocgen/command.tpl` + `gen.go` + `main.go`** — front
matter now carries `title` (from `fullName`) and `description` (from the
command's `Short`), and the leading `# H1` is dropped. The CLI index
page's front matter is taken from the manifest `Command Line` route
(title/description/icon_path).
- **`scripts/apidocgen/postprocess/main.go`** — reads the manifest and,
at write time, injects front matter carrying each section's `title` plus
any curated `description`, `state`, and `icon_path`. The API index
page's front matter is taken from the manifest `REST API` route.
- **`scripts/docgenenv`** (new shared code) — one `YAMLScalar`
front-matter escaper, one `Route`/`Manifest` schema +
`LoadManifest`/`FindRoute`, and one `FrontMatter(Route)` emitter, all
imported by both generators (no duplicated helpers, types, or emitters).
- Regenerated all **166 CLI + 31 API** reference pages.
### Metadata → front matter, and what stays in the manifest
Every *per-page* manifest field is mirrored into the page's front
matter: `title`, `description`, `state`, `icon_path`. The **structural**
fields stay in `manifest.json`:
- `children` — the nav tree (explicitly out of scope).
- `path` — the manifest's pointer to the file; a page carrying its own
path is redundant/error-prone, so it's treated like `children`.
The fields are **duplicated** into front matter and **`manifest.json` is
left unchanged**, so this is a **no-op for rendering today** (coder.com
strips front matter for `llms`, and Algolia + the renderer read only
`title`). Removing the fields from the manifest is the natural
follow-up, gated on the renderer reading them from front matter first.
### Why the API side changes the postprocessor, not the `.dot` templates
The issue text suggested editing
`scripts/apidocgen/markdown-template/*`. I deliberately did **not**,
because the postprocessor derives each page's **filename, section title,
and manifest route** from the leading `# {name}` line
(`extractSectionName`). Emitting front matter from the template would
break that extraction. Instead the widdershins templates still emit `#
{name}`, the postprocessor reads it (and now verifies it), and then
swaps the heading for a front-matter block as each section is written.
## Review follow-ups (Coder Agents Review)
### Round 1 — addressed in `e53d5e03` (all threads resolved)
- **CRF-1 / CRF-4** — de-duplicated the escaper and the
`route`/`manifest` schema + traversal into `scripts/docgenenv` (shared
by both generators).
- **CRF-2** — `YAMLScalar` now quotes YAML-reserved scalars
(`true/false/null/…`, numbers); no current value is affected.
- **CRF-3** — added unit tests: a `YAMLScalar` round-trip, `FindRoute`,
and `prependFrontMatter`.
- **CRF-5** — the CLI and API **index** pages now mirror their manifest
route's title/description/icon_path instead of a hardcoded
`coder`/`API`, fixing a rendered-heading regression (`REST API`/`Command
Line` were being overwritten).
- **CRF-6** — dropped the dead `#login` anchor in
`docs/support/support-bundle.md` (the migrated `login.md` no longer
mints that heading anchor).
- **CRF-7 / CRF-8 / CRF-11** — renamed to `prependFrontMatter`, switched
to `bytes.Cut`, and it now strips the first line only when it is the `#
{name}` heading (`extractSectionName` errors otherwise).
- **CRF-9** — removed the orphan `docs/reference/api/chat.md` (not in
the manifest, not linked; the real page is `chats.md`).
- **CRF-10** — the metadata read and the manifest rewrite now share one
`FindRoute` traversal.
- **CRF-13** — moot under squash-merge; this branch is a single
scopeless commit.
- **CRF-15** — the pre-existing `sort.Slice`/`slices.IsSorted`
comparator is left as-is per the review (out of scope; safe today
because section names are unique).
### Round 2 — addressed in `ee796e7107` (all threads resolved)
- **CRF-16** (P1) — removed three em-dashes from new doc comments (the
only `make lint` failure on the prior head); the emdash gate is green.
- **CRF-17 / CRF-18** — unified front-matter emission into one shared
`docgenenv.FrontMatter(Route)`, used by the API postprocessor directly
and by `command.tpl` via a `frontMatter` template func. This retires the
hand-written template YAML and the
`indexTitle`/`indexDescription`/`indexIconPath` closures, so a new
front-matter field is wired in one place, and it gives the CLI index the
`state` arm it previously lacked. Verified byte-identical: a full CLI +
API regen produces zero page changes.
- **CRF-19** — CLI child sort switched to `slices.SortFunc` +
`cmp.Compare` (typed comparator).
- **CRF-20** — reworded the `prependFrontMatter` comment:
`extractSectionName`'s fail-fast is the load-bearing guard; the prefix
check is a defensive backstop.
- **CRF-21** — added `icon_path`/`state` coverage in `docgenenv`'s
`TestFrontMatter/AllFields` (the branch the index page relies on,
previously at 0%).
- **CRF-22** — `YAMLScalar` no longer emits a trailing-space value as a
bare scalar (YAML strips it on read, so it would not round-trip); added
test coverage.
- **CRF-24** — the shared emitter removed the duplicated `cliIndexRoute`
doc comment; the rationale now lives in one place.
- **CRF-23** (Phase 3, out of scope here) — noted: the API generator
wipes and regenerates `reference/api/` from the manifest, so removing
curated metadata from the manifest in Phase 3 needs another source first
(a generator that preserves existing front matter, or metadata carried
alongside the swagger annotations).
- **Process (Mafu-san)** — the verification set below now leads with
`make lint`, the mandatory CI gate that the earlier list omitted.
## Cross-repo dependency
**Resolved — this PR no longer has a hard merge-ordering gate** (CRF-14
was right; the earlier "must merge after #968" note was stale).
The coder.com surfaces that would otherwise leak raw front matter from
`coder/coder` `main` are already front-matter-aware on merged PRs:
- **coder.com#964** (`DOCS-554`, llms-full.txt corpus + Algolia) —
**merged**.
- **coder.com#974** (`DOCS-574`, the `.md` proxy twin + `llms.txt` index
titles) — **merged**.
coder.com#968 (`DOCS-577`) was re-scoped to only the renderer
route-metadata generalization; it's a no-op on today's corpus and its
own description confirms the "deploy before the generators" constraint
no longer applies (that was driven by the llms corpus, now in #964).
Worth a final confirmation that #964/#974 are **deployed** before merge,
but there's no branch/PR ordering blocker left.
## Verification & evidence
AI was the primary author of this PR (see disclosure below); per the [AI
Contribution
Guidelines](https://coder.com/docs/about/contributing/AI_CONTRIBUTING)
here is manual verification.
- `make lint` (golangci-lint + the emdash gate) passes; `go build` / `go
vet` / `go test` are clean for the generators + `scripts/docgenenv`;
`pnpm check-docs` passes.
- `swagger.json`, `docs.go`, and `manifest.json` are **unchanged** —
metadata is duplicated into front matter; command/section names and
routes did not move.
- The diff is purely additive front matter
(`title`/`description`/`state`/`icon_path`) + the leading H1 removal; no
body reflow. A full CLI + API regen produces **zero** page changes
beyond the two index pages.
<details>
<summary>Terminal evidence</summary>
CLI `description` from the command's `Short` (`YAMLScalar` quotes when
needed, e.g. a `Short` with a colon):
```md
---
title: server
description: Start a Coder server
---
```
API pages inherit curated manifest metadata (only Agents/Chats have any
today):
```md
---
title: Chats
description: "REST endpoints for Coder Agents Chats API (programmatic agent sessions)."
state:
- early access
---
```
Diff scope + "no body changes" proof (uses an explicit `base..HEAD`
range, so it actually tests the claim):
```
$ git diff --shortstat origin/main
210 files changed, 1447 insertions(+), 344 deletions(-)
# = 166 CLI + 31 API reference pages + generators + scripts/docgenenv
# swagger.json / docs.go / manifest.json: NOT modified
# Every removed line under docs/reference is a leading "# H1"; nothing else:
$ git diff origin/main..HEAD -- docs/reference/ | grep '^-' | grep -v '^---' | grep -v '^-# '
(empty)
$ pnpm check-docs
Summary: 0 error(s)
```
</details>
Linear: DOCS-483
> This PR was created with AI assistance (Coder Agents).
Add a new Quickstart starter template that lets users pick programming
languages, editors, and an optional Git repo to clone. The template uses
Docker under the hood but presents a developer-focused experience: pick
your tools, start coding.
## What's included
- **Languages parameter** (multi-select): Python, Node.js, Go, Rust,
Java, C/C++
- **IDEs parameter** (multi-select): VS Code (Browser), VS Code Desktop,
Cursor, JetBrains, Zed, Windsurf
- **Git repo parameter**: Optional URL to clone on workspace start
- **JetBrains filtering**: Maps selected languages to relevant IDE codes
(Python → PyCharm, Go → GoLand, etc.)
- **Docker precondition check**: Uses `data "external"` +
`terraform_data` precondition to surface a friendly error when Docker is
unavailable, before the Docker provider fails with a cryptic message
- **4 presets**: Web Development, Backend (Go), Data Science, Full Stack
- **Single install script**: All languages install in one `coder_script`
to avoid apt-get lock conflicts (agent scripts run in parallel via
`errgroup`)
<details><summary>Design decisions</summary>
- **Docker as invisible backend**: Docker is required on the Coder
server but never mentioned in the user-facing parameter UI. The
experience is entirely "pick languages, pick editors, start coding."
- **`coder_script` over startup_script**: Language installs use a
templated script file (`install-languages.sh.tftpl`) driven by the
languages parameter. A single script avoids dpkg lock contention since
`coder_script` resources execute concurrently.
- **`data "external"` for Docker check**: The external provider probes
Docker availability independently of the Docker provider. If Docker is
down, the `terraform_data` precondition fails with a human-readable
message before any `docker_*` resource is evaluated. This depends on the
Docker provider connecting lazily (at resource eval time, not at
provider init), which current behavior confirms.
- **JetBrains filtering by language**: Rather than showing all 9
JetBrains IDEs, the template computes relevant IDE codes from the
language selection (e.g. Python → PY, Go → GO) and passes them as
`default` to the JetBrains module.
- **Arch-aware Go install**: The install script detects `uname -m` to
download the correct Go binary for amd64 or arm64.
</details>
<details><summary>Screenshots and recordings from the UI</summary>
<p>
<img width="1851" height="1471" alt="Screenshot 2026-05-05 at 2 14
20 PM"
src="https://github.com/user-attachments/assets/d4c9cdc5-d311-43a5-9e2e-f90b0019eda7"
/>
<img width="1851" height="1471" alt="Screenshot 2026-05-05 at 2 15
06 PM"
src="https://github.com/user-attachments/assets/cf3023fe-b6db-4503-a6c4-eaa0ec0659f8"
/>
https://github.com/user-attachments/assets/7507fd7d-ddb5-457a-9f7d-cbf89b36eb20
</p>
</details>
> [!NOTE]
> This PR was authored by Coder Agents.
This change adds a new `docker-devcontainer` template which allows you
to provision a workspace running in Docker, that also creates workspaces
via Docker running inside (DinD).
- **chore(examples/templates): rename `docker-devcontainer` to
`docker-envbuilder`**
- **feat(examples/templates): add `docker-devcontainer` example
template**
This PR changes template names and docs to follow the
`<provider>-<os/whatever>` format for all templates.
I've decided not to split this into multiple PRs because I'd have to
edit rebase the other PRs once one of them gets merged, this should be
relatively low-impact anyways.
This aligns with our goals to make templates more user-friendly.
Closes#15754
Nick Vigilante