fix(setup): fix the agent sandbox and give the agent more facts (6/6)

[atornsii]

This fixes problems that test runs found.

Sandbox (run 8)

• Resolving a path reads the metadata of each parent folder. The sandbox denied it, so realpath, uv, and git failed with "Operation not permitted", and the agent fell back to pip. The parents of each open folder now allow metadata reads, but not their contents.
• ~/.local/share/uv is now writable, because uv writes there when it inspects a managed Python.
• The sandbox now closes /private/tmp, where the agent found another program's files. Each run gets its own temporary folder there, which OpenCode gets as TMPDIR.
• The loopback proxy no longer writes "http: proxy error" lines into the wizard's screen.

Facts (runs 5, 7, and 8)

The facts message now gives the LaunchDarkly project and environment, and the names (never the values) of the model provider keys that are set in the environment or in the project's .env. It tells the agent not to look for keys, print the environment, or ask for a key, and to use $TMPDIR. Before, the agent spent about 25 tool calls finding the project, and it printed the environment or asked the user to paste a key. ldcli setup agent takes --project and --environment for the same facts.

Testing

Sandbox tests now also check realpath in the project, a closed file in /private/tmp, and a writable run folder. uv python find, realpath, git status, and OpenCode work in the sandbox in the test app. New tests cover the provider key names and the facts.

Diagram

flowchart TD
  subgraph facts [Facts for the agent]
    cmds["commands.go<br/>startAgent: project, environment"]:::chg
    cmdag["cmd/setup/agent.go<br/>agentTask with project, environment<br/>--project, --environment"]:::chg
    keys["provider_keys.go<br/>ProviderKeys, dotEnvNames"]:::new
    task["agent.go<br/>Task.ProjectKey, EnvironmentKey<br/>Task.ProviderKeys"]:::chg
    prompt["prompt.go<br/>BuildFacts: project, environment<br/>key names, TMPDIR note"]:::chg
    cmds -->|agentTask| cmdag
    cmdag -->|ProviderKeys| keys
    cmdag -->|fills Task| task
    prompt -->|reads Task| task
  end
  subgraph box [Sandbox and screen]
    srv["server.go<br/>TMPDIR = box.TempDir"]:::chg
    sb["sandbox.go<br/>parentFolders<br/>RunTemp, sharedTemp<br/>.local/share/uv writable"]:::chg
    proc[["opencode serve<br/>own TMPDIR"]]:::ext
    tmp[["/private/tmp<br/>closed, except the run folder"]]:::ext
    proxy["relay_proxy.go<br/>ErrorLog: discard"]:::chg
    srv -->|sandboxCommand| sb
    srv -->|sets TMPDIR| proc
    sb -.->|profile rules| tmp
  end
  classDef new fill:#e6f0fa,stroke:#1d6fb8,stroke-width:2px,color:#19202b
  classDef chg fill:#fbf1e1,stroke:#a86a12,stroke-width:2px,color:#19202b
  classDef earlier fill:#ffffff,stroke:#7a8494,stroke-dasharray:5 4,color:#19202b
  classDef ext fill:#eceefa,stroke:#4e5a9c,stroke-width:2px,color:#19202b

Loading

Blue boxes are new files, orange boxes are changed files, dashed boxes are files from an earlier PR, and purple boxes are outside ldcli. A solid arrow goes from the caller to the code that it calls. A dashed arrow shows data that moves without a direct call.

The facts group starts in the wizard. commands.go passes the selected project and environment to agentTask, which also calls ProviderKeys to get the names of the provider keys that are set. agentTask puts these values in the Task, and BuildFacts writes them into the first message. In the sandbox group, sandboxCommand now creates a run folder in /private/tmp and closes the rest of that folder. It returns the run folder as TempDir, and server.go gives it to OpenCode as TMPDIR. The profile also allows metadata reads on parent folders, so realpath, uv, and git work. relay_proxy.go stops writing proxy errors on the wizard screen.

The two groups do not depend on each other. The facts group changes the wizard from #895 and the prompt from #897. The sandbox group changes files from #896 and #897.

Stack

This is one of six PRs for the ldcli setup agent. Review and merge them in order, after #877 (Go 1.26):

1. OpenCode adapter
2. Wizard agent step
3. macOS sandbox
4. AI SDK and relay
5. OpenCode handler
6. Run fixes

They replace #876 and #878.

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