[only21mil]

Problem

The Orchestration V2 README has a "Tracked Follow-Up: Durable Effect Outbox" section. It says side effects start from reactors that watch live events, and suggests adding a durable outbox later. The outbox already exists: EventSink writes effect requests in the same transaction as their events, and EffectWorker claims and runs them. The section's sample request type also doesn't match the real OrchestrationEffectRequestV2 union. Anyone reading the README gets the current design backwards.

Change

The section now describes the outbox as it works today, in one short paragraph:

• Commands write side-effect requests to the outbox in the same transaction as their events, and the effect worker runs them after the commit.
• Non-title effects for a thread run one at a time, in the order they were queued. Title-generation effects are ordered independently.
• It links to OrchestrationEffectRequestV2 for the list of requests, and to "Durable intent and side effects" in docs/internals/overview.md for recovery and the rules new code must follow.

The made-up request type and the old pipeline diagrams are removed rather than rewritten, so the design reasoning stays on the overview page.

Scope and approval

This is a small, focused fix for an obvious documentation error, under the CONTRIBUTING exception for obvious bugs, with no issue or discussion. It changes only docs/orchestration-v2/README.md, and no behavior changes.

Verification

Docs only: merging head 787b2d1 locally with main e63d80a (not pushed) changes no other file, so the run below covers both. I ran a T3 server from e63d80a on an empty test home with the free Replay (dev) provider, started one thread, sent a second message during its first turn (t3 thread start and t3 thread send), stopped the server, and read a read-only copy of its statev2.sqlite.

Before. main calls the outbox future work:

110:## Tracked Follow-Up: Durable Effect Outbox
112:The current app pipeline uses domain events plus reactors to trigger provider side effects:
124:This is valid, but it can become hard to trace because the provider side effect is implicit in a live subscription. If V2 needs stronger restart/recovery/debuggability, introduce a durable effect outbox for orchestration side effects:

Yet the same server's outbox table, after the two turns:

effect  effect_type          status     tries  enqueued      done          command               cmd_accepted  last_event
------  -------------------  ---------  -----  ------------  ------------  --------------------  ------------  ----------
1       provider-turn.start  succeeded  1      22:30:32.476  22:30:32.767  prepared-run.release  22:30:32.471  15
2       checkpoint.capture   succeeded  1      22:30:37.904  22:30:38.452  checkpoint.capture    22:30:37.924  76
3       provider-turn.start  succeeded  1      22:30:38.175  22:30:38.508
4       checkpoint.capture   succeeded  1      22:30:43.625  22:30:44.309  checkpoint.capture    22:30:43.652  133

Effect 1 carries the id of the command that committed events 12 to 15, written 5 ms after them. Effect 3 (the second turn's start) was written while effect 2 was still running, and that run went from starting to running at 38.474, after effect 2 finished at 38.452.

After. This PR's section says what the run shows. Full queries, output and the new paragraph:

Run output and the new section

$ sqlite3 -readonly -header -column statev2-copy.sqlite "SELECT o.rowid AS effect, o.effect_type, o.status, o.attempt_count AS tries, substr(o.created_at,12,12) AS enqueued, substr(o.completed_at,12,12) AS done, r.command_type AS command, substr(r.accepted_at,12,12) AS cmd_accepted, r.result_sequence AS last_event FROM orchestration_v2_effect_outbox o LEFT JOIN orchestration_command_receipts r USING (command_id) ORDER BY o.rowid"
effect  effect_type          status     tries  enqueued      done          command               cmd_accepted  last_event
------  -------------------  ---------  -----  ------------  ------------  --------------------  ------------  ----------
1       provider-turn.start  succeeded  1      22:30:32.476  22:30:32.767  prepared-run.release  22:30:32.471  15        
2       checkpoint.capture   succeeded  1      22:30:37.904  22:30:38.452  checkpoint.capture    22:30:37.924  76        
3       provider-turn.start  succeeded  1      22:30:38.175  22:30:38.508                                                
4       checkpoint.capture   succeeded  1      22:30:43.625  22:30:44.309  checkpoint.capture    22:30:43.652  133       

$ sqlite3 -readonly -header -column statev2-copy.sqlite "SELECT sequence, event_type, substr(occurred_at,12,12) AS at, json_extract(payload_json,'$.status') AS status FROM orchestration_events WHERE sequence BETWEEN 77 AND 84 ORDER BY sequence"
sequence  event_type                at            status    
--------  ------------------------  ------------  ----------
77        provider-thread.updated   22:30:38.167  not_loaded
78        turn-item.updated         22:30:38.167  completed 
79        run.updated               22:30:38.167  starting  
80        provider-session.updated  22:30:38.474  ready     
81        provider-thread.updated   22:30:38.474  active    
82        run.updated               22:30:38.474  running   
83        run-attempt.updated       22:30:38.474  running   
84        node.updated              22:30:38.474  running   

$ sqlite3 -readonly -header -column statev2-copy.sqlite "SELECT count(*) AS title_generation_effects FROM orchestration_v2_effect_outbox WHERE effect_type = 'thread-title.generate'"
title_generation_effects
------------------------
0

$ sqlite3 -readonly -header -column statev2-copy.sqlite "SELECT e.sequence, e.event_type, e.occurred_at, e.command_id = o.command_id AS same_command FROM orchestration_events e, orchestration_v2_effect_outbox o WHERE o.rowid=1 AND e.command_id=o.command_id ORDER BY e.sequence"
sequence  event_type                occurred_at               same_command
--------  ------------------------  ------------------------  ------------
12        checkpoint-scope.created  2026-11-11T22:30:32.471Z  1
13        node.updated              2026-11-11T22:30:32.471Z  1
14        turn-item.updated         2026-11-11T22:30:32.471Z  1
15        run.updated               2026-11-11T22:30:32.471Z  1

$ git show 787b2d1e3b:docs/orchestration-v2/README.md | grep -n -A2 '^## Durable Effect Outbox'
110:## Durable Effect Outbox
111-
112-Commands record side effects, such as starting a provider turn or capturing a checkpoint, as requests in a durable outbox, committed in the same transaction as their events. The effect worker runs them after the commit, so side-effect intent is persisted rather than implicit in a live event subscription. Non-title effects for a thread run one at a time in enqueue order, and title-generation effects are ordered independently. [`OrchestrationEffectRequestV2`](../../apps/server/src/orchestration-v2/EffectOutbox.ts) lists the requests, and [Durable intent and side effects](../internals/overview.md#durable-intent-and-side-effects) covers recovery and the constraints on new code.

In the code at e63d80a, EventSink.ts calls effectOutbox.enqueue inside the transaction that commits events, projections and the command receipt, and claimableCandidatePredicate in EffectOutbox.ts orders title and non-title effects separately per thread. Both links resolve.

Not checked

• Title-generation ordering rests on reading EffectOutbox.ts. The CLI takes the thread title from the message, so my run queued no title-generation effect.
• Other pages under docs/orchestration-v2/ were only searched for mentions of the outbox or reactors (there are none). They were not otherwise reviewed.

Prior PRs

None found. No open or closed PR changes this README section. The open docs PRs #25705, #26132 and #26133 edit other pages under docs/orchestration-v2/.

Generated with Claude Opus 5.5 and GPT-6.1 Sol in T3 Code Nightly

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Approvability

Verdict: Approved at 5b80095

Macroscope's review found this PR approvable — The documentation now describes the durable effect outbox as implemented behavior and links to implementation and recovery details. No runtime behavior, product defaults, or diagnostic suppressions change.

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Walkthrough

The README replaces a tracked follow-up proposal with a description of the durable effect outbox. It states that commands record side-effect requests with events and a worker executes them after commit.

Changes: Durable effect outbox documentation

Layer / File(s)	Summary
Document outbox behavior docs/orchestration-v2/README.md	Describes recording side-effect requests with events and running them after commit. Non-title effects for a thread run sequentially in enqueue order. Title-generation effects use independent ordering. Links to the request type and recovery documentation.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: Minimal · up to 787b2

This documentation-only change has no identified merge-blocking risk.

Pre-merge checks: 4

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main documentation change: it states that the durable effect outbox is now documented as existing behavior rather than future work.
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.
Description check		The PR updates the Orchestration V2 README's outbox section to describe the existing durable effect outbox, which the author says replaces an outdated follow-up proposal. The description follows the t…

Full details: Description check

Explanation

The PR updates the Orchestration V2 README's outbox section to describe the existing durable effect outbox, which the author says replaces an outdated follow-up proposal. The description follows the template's Problem, Change, Scope and approval, and Verification sections. The Problem and Change sections are clear and specific. Scope cites the CONTRIBUTING exception for obvious bugs and states the change is docs-only. Verification is detailed: it includes a reproduced run against a T3 server, SQLite query outputs, the before and after README text, and code references. The author also lists what was not checked. The template's trailing line asks for the model and harness used, and the description includes that ('Generated with Claude Opus 5.5 and GPT-6.1 Sol in T3 Code Nightly'). The PR title is not in the description, so the conventional commit title requirement cannot be assessed here. Overall the description is mostly complete and specific.

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Review comments at @docs/orchestration-v2/README.md:
- Line 112: Update the ordering sentence in the orchestration README to specify
that non-title effects for a thread run one at a time in enqueue order, while
title-generation effects are ordered independently. Keep the surrounding
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