[juliusmarminge]

Reopening a finished command's tool call made the server send its whole output again (up to 64K characters) every time. The command output subscription used idleTtlMs: 0, so a collapsed row stopped receiving frames for a running command. That's intended, but it also threw away the final output of finished commands, which never changes. The turnItem detail query, used by servers without output streaming and by MCP apps, also dropped finished items after 60 seconds.

• Subscriptions: createEnvironmentSubscriptionAtomFamily has a new completedTtlMs option. When completeWhen matches, the final value moves into a small cache atom, and the live subscription is released. Readers get the cached value for completedTtlMs after the last one leaves.
• Command output: commandOutput sets completeWhen: (view) => !view.running and caches finished output for 5 minutes. Running commands are unchanged: collapsing the row still ends their subscription immediately.
• turnItem: the query now routes to one of two families. A settled item's revision is its updatedAt, so its answer never goes stale (5-minute idle cache). Live items keep the 60-second cache. Call sites are unchanged.

Web and mobile both read these atoms, so both clients get this.

Runtime check (web dev server, a finished Replay command, counting orchestration.subscribeCommandOutput messages on the WebSocket while toggling the row open and closed six times):

	Subscribes for 3 opens
Without completedTtlMs	3
With this change	1

runtime.test.ts covers the subscription cache: a completed subscription reopened after idle removal subscribes once with completedTtlMs and twice without.

Done by Claude Opus 5.5 in Claude Code.

🤖 Generated with Claude Code

[macroscopeapp]

Approvability

Verdict: Approved at f9b5fec

Macroscope's review found this PR approvable — Finished command output is cached briefly so reopening a row avoids refetching, while live queries retain their existing behavior. The change is limited to client-side caching and does not alter command execution or persistent data.

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[coderabbitai]

Walkthrough

Client environment subscriptions can retain completed values for a configured duration. Command-output subscriptions retain completed results for five minutes. Turn-item queries select cache settings based on revision.

Changes: Client state caching

Layer / File(s)	Summary
Completed subscription cache packages/client-runtime/src/state/runtime.ts, packages/client-runtime/src/state/runtime.test.ts	Subscription options now support completedTtlMs. When both completeWhen and completedTtlMs are set, the subscription atom family can reuse a successful completed value until its retention period expires. Tests cover reopening with and without this option.
Command-output completion and retention packages/client-runtime/src/state/orchestration.ts	The command-output subscription completes when its view is no longer running and retains completed results for five minutes.
Revision-based turn-item queries packages/client-runtime/src/state/orchestration.ts	Requests without a revision or with revision "live" use a query family with 60-second stale and idle times. Other revisions use a family with infinite stale time and a five-minute idle TTL.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant Orchestration
  participant RpcSubscriptionFactory as createEnvironmentRpcSubscriptionAtomFamily
  participant SubscriptionFamily as createEnvironmentSubscriptionAtomFamily
  participant CompletedValue as completed-value atom
  Orchestration->>RpcSubscriptionFactory: Configure completion and completedTtlMs
  RpcSubscriptionFactory->>SubscriptionFamily: Forward subscription options
  SubscriptionFamily->>CompletedValue: Retain value after completion
  Orchestration->>SubscriptionFamily: Read subscription after reopen
  SubscriptionFamily->>CompletedValue: Return retained value

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Possibly related PRs

• pingdotgg/t3code#24586: This PR purges discarded temporary threads’ command output on the server. The current change retains completed command-output values on the client, so the two changes both affect command-output availability across lifecycle events.

Suggested labels: bugfix

Suggested reviewers: yash-singh1

Merge Risk: Minimal · up to f9b5f

Finished command output follows the expected completion path, and no actionable merge-blocking issue was established. Merge after normal checks.

Pre-merge checks: 3 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Description check		The description explains the problem, the changes, and the verification results. It does not provide the required scope and approval information.	Add a link to the triaged issue or discussion and the maintainer's explicit approval of the direction and scope. If this is a focused fix that qualifies for an exemption, explain why it is an obvious bug that needs no prior issue or discuss…

Passed checks: 3 passed

Check name	Status	Explanation
Title check		The title clearly identifies the main change: reopening a finished command row no longer refetches its output.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Review info

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• Source mode: Auto
• Repository: pingdotgg/t3code
• Branch: t3/command-output-cache
• File: .coderabbit.config.ts
• Commit: f9b5fec
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• Run ID: b0f5f337-adbf-4f31-85f7-6e646ba2cf69

Commits

Reviewing files that changed from the base of the PR and between 1fed70c and f9b5fec.

Files selected for processing: 3

• packages/client-runtime/src/state/orchestration.ts
• packages/client-runtime/src/state/runtime.test.ts
• packages/client-runtime/src/state/runtime.ts

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