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Send the phase of Responses answers back - #1236

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responses-assistant-phase
Oct 17, 2026
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crmne merged 1 commit into
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responses-assistant-phase

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@crmne crmne commented Oct 17, 2026 •

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Reworks #1231 by @yorzi: instead of replaying a phased turn from its raw output, the message keeps its phase (persisted in a new phase column, added by the install and 2.2 upgrade generators) and the Responses protocol sends it with the assistant item it rebuilds from the local transcript. Edits to a stored message still reach the request, and nothing replays raw unless the output's messages carry different phases.

New cassettes show OpenAI (gpt-5.4, with a tool call: commentary then final_answer) and DeepSeek (streamed, two turns) accepting the phase sent back.

Fixes #1230

Summary by CodeRabbit

  • New Features
    • Assistant answer phases are preserved across streamed and non-streamed responses, conversation history, and database storage.
    • When replaying conversations, phase information is included for compatible providers. Responses with differing phases retain their original content for replay.
  • Upgrade
    • The Rails upgrade adds a nullable phase field to messages. Existing data remains unchanged.

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Reviewing files that changed from the base of the PR and between 0d53eef and 119d543.

📒 Files selected for processing: 16
  • lib/ruby_llm/active_record/chat_methods.rb
  • lib/ruby_llm/active_record/message_methods.rb
  • lib/ruby_llm/message.rb
  • lib/ruby_llm/protocol.rb
  • lib/ruby_llm/protocol/stream_accumulator.rb
  • lib/ruby_llm/protocols/responses/chat.rb
  • lib/ruby_llm/protocols/responses/streaming.rb
  • spec/dummy/db/schema.rb
  • spec/ruby_llm/active_record/chat_methods_spec.rb
  • spec/ruby_llm/chat_model_switch_replay_spec.rb
  • spec/ruby_llm/generators/upgrade_generator_spec.rb
  • spec/ruby_llm/protocol/stream_accumulator_spec.rb
  • spec/ruby_llm/protocols/responses/chat_spec.rb
  • spec/ruby_llm/protocols/responses/streaming_spec.rb
  • spec/ruby_llm/providers/deepseek/responses_spec.rb
  • spec/ruby_llm/providers/openai/responses_spec.rb
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Reviewing files that changed from the base of the PR and between 87d17a2 and 622a0d6.

📒 Files selected for processing: 2
  • lib/ruby_llm/protocols/responses/chat.rb
  • spec/ruby_llm/protocols/responses/chat_spec.rb
🚧 Files skipped from review as they are similar to previous changes: 2
  • spec/ruby_llm/protocols/responses/chat_spec.rb
  • lib/ruby_llm/protocols/responses/chat.rb

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📝 Walkthrough

Assistant message phases now pass through Responses parsing and streaming, message persistence, and request rendering. Migration templates and schema updates add the phase column. Tests cover phase retention and follow-up requests.

Changes: Responses phase preservation

Layer / File(s) Summary
Message phase storage
lib/ruby_llm/message.rb, lib/ruby_llm/active_record/*, lib/generators/ruby_llm/.../templates/*, spec/dummy/db/*, spec/ruby_llm/active_record/chat_methods_spec.rb, spec/ruby_llm/generators/upgrade_generator_spec.rb, docs/_reference/upgrading.md
RubyLLM::Message stores and serializes phase. Active Record persists and reloads it when the column is supported. Install and upgrade migrations add the column, and upgrade rollback removes it.
Phase parsing and streaming
lib/ruby_llm/protocol/stream_accumulator.rb, lib/ruby_llm/protocols/responses/{chat,streaming}.rb, spec/ruby_llm/protocol/stream_accumulator_spec.rb, spec/ruby_llm/protocols/responses/{chat,streaming}_spec.rb
Responses parsing and final stream chunks carry assistant phases into messages. Raw output is retained when message items have different phases or when some items have no phase. Specs cover parsing, streaming, and replay behavior.
Phase replay on later requests
lib/ruby_llm/protocol.rb, lib/ruby_llm/protocols/responses/chat.rb, spec/ruby_llm/chat_model_switch_replay_spec.rb, spec/ruby_llm/protocols/responses/chat_spec.rb, spec/ruby_llm/providers/{deepseek,openai}/responses_spec.rb, spec/fixtures/vcr_cassettes/providers_{deepseek,openai}_responses_*.yml
Responses request rendering includes a message phase when present. Phase-bearing messages qualify as native content. Provider specs and cassettes cover follow-up conversations, including a tool call and streamed answers.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: kieranklaassen

Merge Risk: 🔵 Low · up to 622a0

Phase replay is not blocked by an established issue, but rolling back the dummy-app migration leaves its phase column behind. This is a bounded migration concern to fix or explicitly accept before merging.

Pre-merge checks: Passed 5 · Failed 2

Failed Failed checks: 2 warnings

Check name Status Explanation Resolution
Description check Warning The description explains the implementation, affected providers, persistence changes, replay behavior, and linked issue, but it omits the required template sections for type, scope, quality checks, ow… Add the missing template sections and complete the applicable checkboxes. Include the change type, scope confirmations, testing and documentation status, ownership confirmation, and API change classification.
Docstring Coverage Warning Docstring coverage is 16.67% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 24 functions across 17 files. Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed Passed checks: 5 passed
Check name Status Explanation
Title check Passed The title clearly summarizes the main change: sending the Responses API answer phase back in later requests.
Linked Issues check Passed The changes satisfy the coding requirements in #1230. RubyLLM::Message stores and persists phase. Responses parsing and streaming retain the phase. Responses replay renders the phase on rebuilt as…
Out of Scope Changes check Passed The changes remain within #1230. Schema generators, Active Record conversion, message storage, protocol parsing, replay rendering, streaming, tests, and cassettes directly support phase preservation a…
Review Evidence Stays Out Of The Repository Passed The changed-file inventory contains no image, video, audio, HTML comparison page, or recording files. The two added YAML files are VCR HTTP fixtures in spec/fixtures/vcr_cassettes; the corresponding…
Dependencies From Sources The Maintainer Controls Passed The pull request does not modify a manifest, lockfile, or package-manager configuration. The changed files contain application code, migrations, documentation, specs, and VCR cassettes. No added git U…
Full details: Linked Issues check

Explanation

The changes satisfy the coding requirements in #1230. RubyLLM::Message stores and persists phase. Responses parsing and streaming retain the phase. Responses replay renders the phase on rebuilt assistant items. Raw replay remains active when messages have different phases, including phased and unphased messages. Tests cover persistence, sync replay, streaming, edits, and provider responses for OpenAI and DeepSeek.

Full details: Out of Scope Changes check

Explanation

The changes remain within #1230. Schema generators, Active Record conversion, message storage, protocol parsing, replay rendering, streaming, tests, and cassettes directly support phase preservation and replay. No unrelated change is demonstrated.

Full details: Review Evidence Stays Out Of The Repository

Explanation

The changed-file inventory contains no image, video, audio, HTML comparison page, or recording files. The two added YAML files are VCR HTTP fixtures in spec/fixtures/vcr_cassettes; the corresponding provider specs use them for automated replay tests. They are project test data, not reviewer-only evidence.

Full details: Dependencies From Sources The Maintainer Controls

Explanation

The pull request does not modify a manifest, lockfile, or package-manager configuration. The changed files contain application code, migrations, documentation, specs, and VCR cassettes. No added git URL, fork dependency, patch, override, replace entry, or alternate registry is present.

Full details: Description check

Explanation

The description explains the implementation, affected providers, persistence changes, replay behavior, and linked issue, but it omits the required template sections for type, scope, quality checks, ownership, and API changes.

Resolution

Add the missing template sections and complete the applicable checkboxes. Include the change type, scope confirmations, testing and documentation status, ownership confirmation, and API change classification.

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👉 Steps to fix this

Actionable comments posted: 2


  • 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @lib/ruby_llm/protocols/responses/chat.rb:
- Around line 125-126: Update message_phases to retain a nil entry for each
message without a phase, so keep_raw_output? detects mixed phased and unphased
messages and preserves the raw output for replay.

Review comments at @spec/dummy/db/migrate/20261017130000_add_message_phase.rb:
- Line 5: Make the migration reversible by replacing the conditional
`add_column` statement with explicit `up` and `down` methods: add
`messages.phase` in `up` and remove it in `down`, so rollback drops the column.

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📥 Commits

Reviewing files that changed from the base of the PR and between effd1e7 and 87d17a2.

📒 Files selected for processing: 22
  • docs/_reference/upgrading.md
  • lib/generators/ruby_llm/install/templates/create_messages_migration.rb.tt
  • lib/generators/ruby_llm/upgrade/templates/upgrade_ruby_llm_to_2_2.rb.tt
  • lib/ruby_llm/active_record/chat_methods.rb
  • lib/ruby_llm/active_record/message_methods.rb
  • lib/ruby_llm/message.rb
  • lib/ruby_llm/protocol.rb
  • lib/ruby_llm/protocol/stream_accumulator.rb
  • lib/ruby_llm/protocols/responses/chat.rb
  • lib/ruby_llm/protocols/responses/streaming.rb
  • spec/dummy/db/migrate/20261017130000_add_message_phase.rb
  • spec/dummy/db/schema.rb
  • spec/fixtures/vcr_cassettes/providers_deepseek_responses_sends_the_phase_of_a_streamed_answer_back_on_the_next_turn.yml
  • spec/fixtures/vcr_cassettes/providers_openai_responses_sends_the_phase_of_each_answer_back_on_later_turns.yml
  • spec/ruby_llm/active_record/chat_methods_spec.rb
  • spec/ruby_llm/chat_model_switch_replay_spec.rb
  • spec/ruby_llm/generators/upgrade_generator_spec.rb
  • spec/ruby_llm/protocol/stream_accumulator_spec.rb
  • spec/ruby_llm/protocols/responses/chat_spec.rb
  • spec/ruby_llm/protocols/responses/streaming_spec.rb
  • spec/ruby_llm/providers/deepseek/responses_spec.rb
  • spec/ruby_llm/providers/openai/responses_spec.rb

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Comment thread lib/ruby_llm/protocols/responses/chat.rb Outdated
Comment thread spec/dummy/db/migrate/20261017130000_add_message_phase.rb
crmne pushed a commit that referenced this pull request Oct 17, 2026
A turn whose messages mix a phase with none would rebuild as one item
labelled with that phase, relabelling the unphased text. Raised in
review on #1236.
crmne pushed a commit that referenced this pull request Oct 17, 2026
OpenAI and DeepSeek label each Responses answer with a phase, which
OpenAI asks clients to send back. The message now keeps it, in a new
phase column, and the rebuilt assistant item carries it, so edited
messages still reach the request.

Closes #1230. By @yorzi.
@crmne
crmne force-pushed the responses-assistant-phase branch from 622a0d6 to 0d53eef Compare October 17, 2026 17:57
OpenAI and DeepSeek label each Responses answer with a phase, which
OpenAI asks clients to send back. The message now keeps it, in a new
phase column, and the rebuilt assistant item carries it, so edited
messages still reach the request.

Closes #1230. By @yorzi.

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[BUG] Responses replay drops the assistant phase of a turn with one reasoning item

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