02.7: Short-Term Memory

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このページは生成AIによって作成された下書きです。内容は確認済みですが、正確な情報はソースコードもあわせてご確認ください。

The short-term memory contributor retrieves recent conversation summaries and category blocks across server channels and emits cadence-gated tool nudges.

Flow and ownership

The contributor buildShortTermMemoryContext in src/utils/text/context/memories.ts coordinates memory retrieval and prompt construction:

1. Preconditions and gating:
   • Requires a triggering user ID. Returns an empty result if absent.
   • When automatic short-term memory is disabled (short_term_memory_enabled === false), the bot suppresses the cadence nudge and the write tool. Existing memory content still renders so operators can curate memories manually.
2. Channel memory retrieval:
   • Same-channel memory: Retrieves the active running summary or category block for the current channel.
   • Other-channel memories: Retrieves up to three recent conversation summaries from other channels (MAX_OTHER_CHANNEL_MEMORIES = 3), sorted by update recency.
   • Privacy filtering: Excludes other-channel memories originating from private channels unless stm_privacy_bypass is active.
   • Cross-server memory: Folds in memories from other servers when the user has opted in via their personal settings.
3. Render modes:
   • crude_summary (default): Emits the summary or category block followed by recent raw messages.
   • supersede: When a summary or category block exists, raw messages for that channel are omitted.
4. Unified cadence nudge (nudgeItem):
   • Emits a prompt hint instructing the model to invoke {short_term_memory_tool} after responding.
   • Gated by turnsSinceRefresh >= refreshCadence (default 5). The same counter and condition govern both initial creation and ongoing refresh.
   • Suppressed when the model lacks tools (has_tools === false), the provider is NovelAI, or an explicit long-term memory command is detected (explicitLongTermMemoryIntent === true). The model is the turn’s planned model (channel or persona override included), not the server default.
   • The nudge and the same-channel block carry requiresToolCalling, so a fallback attempt that sends no tools drops both while other-channel memories stay.
   • Carries an empty completionText projection, so NovelAI request fitting also excludes a nudge built for another model before a personal override or fallback; actual memory contents remain eligible.
   • Returned out-of-band alongside nudgeInjectionDepth (default 2, placing it before the latest user/bot turn pair).
5. Content placement: Same-channel memory younger than 60 minutes, or any block carrying other-channel content, receives the STM_TAIL_SLOT marker. Native assembly defers that content even when the configured depth is -1. Stale same-channel-only content keeps its configured placement, with -1 remaining above history.

Positional injection contract

applyPromptLayoutInserts in src/utils/text/context/promptLayout.ts compares the fresh block’s tail-slot position with its configured dialogue-item depth and chooses the position closer to the end. Saved depths retain their item-based meaning. The cadence nudge keeps its independent depth. Registry order places STM content before its nudge when the positions coincide. These rules apply after native or preset assembly; presets cannot pull fresh STM into an early marker.

Constraints and rationale

• Out-of-band delivery: Preserving nudgeItem and deferred memoryInjectionItems outside contextItems ensures that preset reassembly does not pull recency-sensitive notes into the system prefix.
• Explicit memory intent suppression: When a user explicitly asks the bot to remember or store information permanently, the short-term memory nudge is suppressed so the model selects create_long_term_memory instead.
• Fail-safe execution: Any error during short-term memory assembly logs a warning and returns an empty list, preventing memory lookup failures from aborting the turn.

Source pointers

• src/utils/text/context/memories.ts: buildShortTermMemoryContext and freshness calculations.
• src/utils/cache/shortTermMemoryCache.ts: in-process short-term memory cache.
• src/utils/db/repositories/ShortTermMemoryRepository.ts: durable database persistence.
• src/utils/chat/contextPipeline.ts: appendTailDirectives positional dialogue splicing.
• src/utils/text/context/promptLayout.ts: positional insertion and tail-slot comparison.
• Short-Term Memory Pipeline: Working memory capture, category upgrades, and cache lifecycles.