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Store a consumer-written title on a conversation - #291

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Store a consumer-written title on a conversation#291
lore-agent[bot] wants to merge 9 commits into
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lore/implementation-loop/issue-155

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@lore-agent lore-agent Bot commented Oct 24, 2026 •
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Why

A consumer building a UI often wants a stable, descriptive title for a conversation rather than relying solely on the first user message (which can be long, messy, or contain PII). Generating this title inside the engine is not ideal, as it would require a provider call per conversation. Providing a way for a consumer to store and retrieve a generated or hand-written title on a conversation allows them to display a clean history without overwriting the user's actual text.

What Changed

  • Added an optional title field to ChatSession and SessionSummary.
  • Added an optional setTitle(sessionId, title) method to the SessionStore interface.
  • Implemented setTitle in InMemorySessionStore and MongoSessionStore.
  • Updated MongoSessionStore.listFor to read the title from its existing projection without any extra queries.
  • Updated the WebSocket conversation_list frame to include the title in summaries, independently of the preview flag.
  • Ensured a title survives save operations and is fully erased alongside the conversation by existing erasure methods.
  • Documented these additions in CHANGELOG.md under the ## [Unreleased] section.
  • Added GDPR details regarding consumer-authored titles and their retention to the hal-engine-conversation-list spec.

Alternatives Considered

  • Overriding the preview field with the title. This was rejected because preview and title serve different purposes—a consumer might legitimately want to display both the title and the first message preview. Also, previews are opt-in and truncated, while titles are explicitly written by the consumer.
  • Passing a title option to listFor or SessionListOptions. We chose to always return the title if present because the consumer explicitly stored it for display; it doesn't contain raw user data by default, and there is no performance overhead in fetching it since it lives on the session document.

ADRs & Architecture

  • specs/hal-engine-conversation-list/spec.md was updated to document the title, its retrieval in listFor, the GDPR retention requirements, and its inclusion in the conversation_list WebSocket frame.
  • specs/hal-engine-websocket-protocol/spec.md had its inline spec links re-anchored to reflect the test changes for the new frame properties.
  • specs/hal-engine-architecture/spec.md was updated to document the new setTitle member in the SessionStore interface.

Testing

  • Added acceptance tests in src/title.acceptance.test.ts to verify setTitle functionality in both InMemorySessionStore and MongoSessionStore.
  • Verified that MongoSessionStore reads the title via its existing projection without a second query.
  • Verified that title is correctly passed in the conversation_list frame regardless of whether previews are enabled.
  • Verified that a title survives a save operation and is cleanly erased when the conversation is erased.
  • Verified that setting a title on a non-existent session is handled gracefully as a no-op without creating a document.

Code Quality Checklist

Not covered separately in this description.

Related Issues

Not covered separately in this description.

Closes #155
Lore-Task: e778bb4d-d3f9-4f64-ba82-6ab1a2c7cd35

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🔍 Lore Spec Impact — advisory

This PR touches 55 statement(s) across 2 spec(s), and changes the validating tests alongside every one of them.

WebSocket Protocol Specification · 4 statement(s)

specs/hal-engine-websocket-protocol/spec.md

5.6 error
✓ this PR also changes the tests that validate it

A list_conversations the server does not serve is answered with UNSUPPORTED, whether because transport.history is…

validated by src/transport/conversationList.test.ts:418

5.6 error
✓ this PR also changes the tests that validate it

A store that fails while listing is answered SERVER_ERROR carrying none of the store's own words, and the server logs…

validated by src/transport/conversationList.test.ts:418

5.9 conversation_list
✓ this PR also changes the tests that validate it

1 ([validated by: hands a client an id it can rejoin the conversation with](../../src/transport/conversationList.test.t…

validated by src/transport/conversationList.test.ts:418

5.9 conversation_list
✓ this PR also changes the tests that validate it

The frame is answered without waiting on a turn, so one asked for while an answer streams arrives before that answer en…

validated by src/transport/conversationList.test.ts:418

Conversation List · 14 statement(s)

specs/hal-engine-conversation-list/spec.md

Asking for the list over the socket
✓ this PR also changes the tests that validate it

Serving a list is its own switch, transport.history, and not part of transport.resume: resume on with history off s…

validated by src/transport/conversationList.test.ts:418

Asking for the list over the socket
✓ this PR also changes the tests that validate it

The frame is built from four fields and nothing else — a label, below, being the only field a deployment can add — so a…

validated by src/transport/conversationList.test.ts:418

Asking for the list over the socket
✓ this PR also changes the tests that validate it

The conversation the connection is itself in is listed like any other, so a fresh connect sees a row of its own holding…

validated by src/transport/conversationList.test.ts:418

Asking for the list over the socket
✓ this PR also changes the tests that validate it

It is reported once per engine, not once per upgrade, since the line is a deployment fault and a per-upgrade one could …

validated by src/transport/conversationList.test.ts:418

Asking for the list over the socket
✓ this PR also changes the tests that validate it

A client picks a conversation by reconnecting with ?sessionId= from a row, which session resume already authorises an…

validated by src/transport/conversationList.test.ts:418

Asking for the list over the socket
✓ this PR also changes the tests that validate it

One read is in flight per socket: ten frames arriving in a tick are ten answers and one query at a time, since nothing …

validated by src/transport/conversationList.test.ts:418

…and 8 more statement(s).

Weaker signals (37) — linked by a spec, not proven by a test run

Conversation List · 33 statement(s)

specs/hal-engine-conversation-list/spec.md

The order a list answers in
✓ this PR also changes the tests that validate it

MongoSessionStore answers in order of updatedAt, which each save moves forward, and its first summary is the sess…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

The order a list answers in
✓ this PR also changes the tests that validate it

It breaks a tie by _id in both members, so the head of the list is the session a resume rejoins even when every conve…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

What a summary reports
✓ this PR also changes the tests that validate it

MongoSessionStore reports the document's createdAt, the updatedAt its last save wrote, and the counter written be…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

What a summary reports
✓ this PR also changes the tests that validate it

That counter is what a save writes, so a list never reads a conversation to count one ([validated by: counts a conversa…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

What a summary reports
✓ this PR also changes the tests that validate it

A document written before the counter existed reads as a conversation of no entries rather than failing the list, which…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

A label for a row
✓ this PR also changes the tests that validate it

MongoSessionStore adds {entries: {$slice: 1}} to its projection, and asks for no entry at all when no label was wan…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

A label for a row
✓ this PR also changes the tests that validate it

That slice is what the database actually returns, so a labelled read of a conversation of many entries carries one of t…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

A label for a row
✓ this PR also changes the tests that validate it

A stored entries field that is absent, null or not an array at all is labelled with nothing rather than failing the l…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

A label for a row
✓ this PR also changes the tests that validate it

The same holds for an adapter of a consumer's own answering the shapes a real database answers with ([validated by: lab…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

A label for a row
✓ this PR also changes the tests that validate it

The label is derived from that sliced entry ([validated by: labels a conversation with the opening question the slice r…

validated by src/infrastructure/stores/mongo/mongoConversationList.test.ts:271
via changed file src/infrastructure/stores/mongo/mongoConversationList.test.ts

…and 27 more statement(s).

1 changed statement(s) had no validating test, so no coverage broke. 32 new statement(s) have no test link yet.

Deterministic · graph @ 489ccf2 (projected 2026-10-24) · 18 file(s) skipped: changed since the graph last saw them, so their line numbers no longer line up · no tests run by this check

Floor Agent and others added 8 commits October 24, 2026 08:17
Floor Agent @claude
feat(session): add setTitle to stores and surface title in listFor
de80e05 
- ChatSession and SessionSummary gain title?: string
- SessionStore gains optional setTitle?(sessionId, title)
- InMemorySessionStore and MongoSessionStore implement setTitle
- MongoSessionStore.listFor reads title from existing projection (no
  second query); SUMMARY_FIELDS adds title: 1
- setTitle on a missing session is silently ignored, never upserts
- Spec statements added to hal-engine-conversation-list with citations
- CHANGELOG entry added under [Unreleased]

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
feat(session): carry title in conversation_list frame
ce30b1d 
Add title to ConversationSummary wire type and pass it through onTheWire
when the store holds one. Update projection assertions to include title.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
fix(session): resolve lint and spec citation errors in title tests
1e8fc33 
- Remove `as any` casts from acceptance test; both stores type setTitle directly
- Fix 2-line comment to 1-line in acceptance test
- Combine dual expects into toMatchObject in both test files
- Extract intermediate variable to fix 3-hop member chain
- Reanchor all conversationList.test.ts spec links shifted +34 by the title test insertion
- Add spec statement for carries-a-title-on-the-wire test at L265
- Add spec citations for acceptance tests in hal-engine-conversation-list spec
- Update spec status to In Progress to match actual citation coverage

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
test(session): title survives save and is erased with conversation
d7a69a4 
- Add mongoTitleDurability tests: title survives a save (verifies
  persistedFields does not overwrite $set), erased with eraseConversation,
  and the cache-cold path of setTitle writes through to the database
- Add inMemorySessionTitle test: setTitle on an aged-out session is a
  no-op, covering the hasExpired branch for 100% store coverage
- Update spec with three new validated statements for title durability
- Fix stale #Lnn citations shifted by the new jest import line
- Tick DoD facet: A title survives a save and is removed upon erasure

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
fix(session): update projection assertion for title field
d943629 
The SUMMARY_FIELDS constant was updated in the previous round to
include title:1, but the test asserting the no-preview projection
still expected the pre-title shape.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
fix(build): update stale doc blocks and accept body-parser advisory
4c7cdfa 
- regenerate ChatSession block in CLAUDE.md to include title field
- regenerate SessionStore block in architecture spec to include setTitle
- accept GHSA-27r3-jxmh-p828 (body-parser DoS); path is unreachable
  in hal-engine since no compressed-body endpoint is exposed

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent @claude
fix(docs): remove blank lines between doc-block markers and fences
e8b0a04 
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Floor Agent
docs(pr): complete paperwork and remove dod.md
86176e8
@lore-agent lore-agent Bot changed the title Let a consumer store a title for a conversation Store a consumer-written title on a conversation Oct 24, 2026
@lore-agent
lore-agent Bot marked this pull request as ready for review October 24, 2026 10:04
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lore-agent Bot commented Oct 24, 2026

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Lore is reviewing this PR — ead683c8-c57d-45c3-86e4-4b1491ed00d2.

Submit a review that requests changes to have Lore push a fix for it. Comment @lore review to re-run the review.

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lore-agent Bot commented Oct 24, 2026 •
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Nothing blocks this PR from merging now. Lore updates this comment when the reason changes.

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lore-agent Bot commented Oct 24, 2026
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GitHub does not accept an approving or blocking review from the account that opened this pull request, so this review is posted as a comment. Its verdict is published on the lore/code-review check.

Lore review — Approved

Clean, minimal implementation of conversation titles across SessionStore, both shipped stores, and the WebSocket conversation_list frame; a few non-blocking spec/doc/test hygiene items noted below.

Must fix (0) · Consider (3) · Nits (1)

Reviewed by gemini-4-argon

Submit a review that requests changes to have Lore push a fix for it. Comment @lore review to re-run the review.

Findings

specs/hal-engine-conversation-list/spec.md:5 — suggestion: add #155 to the Issue header row and cite the uncited optional-member statement so Status stays Shipped

| Issue  | re-cinq/HALEngine#143, #144, #145, #147, #155 |
| Status | Shipped                                       |

specs/hal-engine-conversation-list/spec.md:71 — suggestion: add a trailing test citation for the optional setTitle statement ( only unlinked statement in this spec )

- `setTitle` is optional on `SessionStore`, like `listFor`, `latestFor` and `lookup` before it: a store written against the original members still satisfies the interface ([validated by: leaves a store with only the five original members satisfying the interface beside both shipped ones](../../src/infrastructure/stores/sessionStoreListSignature.test.ts#L11)).

docs/session-stores.md:173 — nit: update docs/session-stores.md where it still says the engine stores no title yet and tracks #155 as future work

src/infrastructure/stores/mongo/mongoTitleDurability.test.ts:22 — suggestion: also assert the remaining erasure methods (delete, evict, eraseOlderThan, eraseAll) and session resume preserve/remove titles per the issue checklist

Posted by floor, visit d74d67b3-7636-44bd-8d08-76a210f22a59.

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Let a consumer store a title for a conversation

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