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fix: add preset support to MCP tools (#24694)

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The chat tools (`read_template`, `create_workspace`) did not surface or
respect template version presets. Presets were invisible to the LLM and
preset parameter defaults were never applied at workspace creation. The
`toolsdk` MCP surface had the same gap (ref #24695, now subsumed here).

## What this changes

- **`read_template`** returns presets with `id`, `name`, `default`,
`description`, `icon`, `parameters`, and `desired_prebuild_instances`
(when set), so the LLM can pick the right preset and prefer
prebuilt-backed ones.
- **`create_workspace`** accepts a `preset_id`. The wsbuilder applies
preset parameter defaults and may claim a prebuilt workspace.
- **`start_workspace`** does *not* accept a preset. Presets are a
creation-time choice; subsequent starts use the workspace's existing
version and parameters. Users who need a specific preset or version on
an existing chat can create the workspace out-of-band (CLI / UI / API)
with the desired configuration and attach the chat to it.
- **`toolsdk`** gains `GetTemplate` (with presets including
`desired_prebuild_instances`), preset support on `CreateWorkspace`, and
preset + `rich_parameters` support on `CreateWorkspaceBuild`. The
`template_version_preset_id` description warns about preset/version
affinity.


> 🤖 Generated with [Coder Agents](https://coder.com/agents) and reviewed by a human.

Co-authored-by: Max schwenk <maschwenk@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Cian Johnston
2026-05-01 10:57:52 +01:00
committed by GitHub
parent 90bee3aaef
commit 04cc983833
10 changed files with 1290 additions and 48 deletions
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coderd/export_test.go
+9
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@@ -2,3 +2,12 @@ package coderd
// InsertAgentChatTestModelConfig exposes insertAgentChatTestModelConfig for external tests.
var InsertAgentChatTestModelConfig = insertAgentChatTestModelConfig
// ChatStartWorkspace exposes chatStartWorkspace for external tests.
//
// chatStartWorkspace is intentionally unexported to keep symmetry with
// its sister chatCreateWorkspace. The alias lets external tests drive
// the RequireActiveVersion auto-update path end-to-end without
// stubbing the entire DB layer. The proper fix is to extract a pure
// request builder; tracked in CODAGT-292.
var ChatStartWorkspace = (*API).chatStartWorkspace