When a workspace has no POSIX sh on PATH (typical for fresh Windows workspaces), the execute tool fails with a raw `exec: "sh": executable file not found in %PATH%` error the model cannot act on.
This change:
- Enriches the above error in chattool with remediation steps and a docs link.
- Documents the requirement in the Coder Agents architecture page.
> This PR was generated by Coder Agents on behalf of @johnstcn
> Mux opened this PR on behalf of Mike.
Fixes CODAGT-451
Adds optional `model_intent` metadata to the built-in execute tool
schema so tool calls can carry a short user-facing intent label without
duplicating the command or duration.
The Agents UI now composes that intent with the existing execute command
and duration fields, displaying labels like `Checking repository state
using git fetch origin for 2.3s` while keeping the shell command visible
as the audit-relevant action.
Existing execute calls without an intent keep the previous `Ran
<command>` fallback label, so only intent-bearing calls get the new
composed label.
- Moves `coderd/chatd/`, `coderd/gitsync/`, `enterprise/coderd/chatd/`
under `x/` parent directories to signal instability
- Adds `Experimental:` glue code comments in `coderd/coderd.go`
> 🤖 This PR was created with the help of Coder Agents, and was
reviewed by my human. 🧑💻
Cian Johnston