Memory Pipeline

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The memory pipeline manages state writes around a chat turn. It records recent conversation turns in working memory, handles model-authored summary upgrades, and persists long-term facts to the database through tool calls.

The pipeline splits into two distinct paths:

Short-term memory (STM): captures conversation turns into an in-process cache after each generation turn, with optional model-authored summary or category upgrades via the update_short_term_memory tool.
Long-term memory (LTM): executes database writes when the model invokes create_long_term_memory or update_long_term_memory during the tool loop.

An intent detection gate checks whether the user asked to remember information permanently, steering the model toward LTM tools instead of STM upgrades.

Intent detection gate

The gate function hasExplicitLongTermMemoryIntent() in src/utils/memory/explicitLongTermMemoryIntent.ts runs during turn context initialization in src/utils/chat/contextPipelineIntent.ts. It normalizes the user message using NFKC formatting and checks it against localized phrases defined in EXPLICIT_MEMORY_PACK_KEY (src/utils/text/localeIntentPacks.ts).

When explicit intent matches:

streamingContext.explicitLongTermMemoryIntent is set to true.
UpdateShortTermMemoryTool.isAvailableForContext() returns false, removing the STM upgrade tool from the offered tool definitions.
The prompt nudge built in buildShortTermMemoryContext() (src/utils/text/context/memories.ts) is omitted.
If invoked directly, UpdateShortTermMemoryTool.execute() rejects execution.

flowchart TD
    UserMessage["Incoming User Message"] --> IntentGate["Intent Detection Gate<br/>hasExplicitLongTermMemoryIntent()"]
    IntentGate -- Explicit intent --> SetIntentFlag["Set explicitLongTermMemoryIntent<br/>Suppress STM upgrade tool & prompt nudge"]
    IntentGate -- Normal message --> ToolLoop["Tool Loop Execution"]
    SetIntentFlag --> ToolLoop
    ToolLoop -- create_long_term_memory / update_long_term_memory --> LTMPath["LTM Database Writes<br/>server_memories / personal_memories"]
    ToolLoop -- update_short_term_memory --> STMUpgrade["STM Summary Upgrade<br/>short_term_memories upsert"]
    ToolLoop --> PostTurn["Post-Turn Effects<br/>runPostTurnEffects()"]
    PostTurn --> PassiveSTM["Passive STM Capture<br/>storeShortTermMemory()"]

Sub-pipelines

Sub-pipeline	Stages	Scope
STM	01: Passive Capture 02: Summary Upgrade	Working memory: in-process cache turns and durable `short_term_memories` rows
LTM	01: Memory Creation 02: Memory Update & Delete	Permanent storage: database writes for server and personal memory tables

Cross-references

Post-turn write caller: Run Generation Turn: Post-Turn Effects triggers passive STM capture after generation completes.
Tool execution caller: Execute Tool Call runs tool-initiated memory updates.
STM reader: Short-Term Memory Context formats working memory entries for prompt assembly.
Server memory reader: Server Memories Context formats server-wide memories for prompt assembly.
Personal memory reader: Participants Context hydrates personal memories for each participant.

Memory taxonomy

Type	Storage	TTL	Write path	Context consumer
STM crude turns	In-process cache (`Map`)	Entry: 12 hours, or 24 when summary text exists	Passive turn capture (`storeShortTermMemory`)	STM context assembly
STM summary / categories	In-process cache and `short_term_memories` table	Cache: 24 hours with summary text, otherwise 12 hours; database: separate retention	Tool call (`update_short_term_memory`)	STM context assembly (takes priority over crude turns)
LTM server memory	`server_memories` table	Permanent	Tool call (`create_long_term_memory`)	Server memories context assembly
LTM personal memory	`personal_memories` table	Permanent	Tool call (`create_long_term_memory`)	Participants context assembly

Shared constraints and lifecycle

Feature flags

LTM tools: both create_long_term_memory and update_long_term_memory require self_teaching_enabled = true in TomoriState.config. When disabled, tool execution aborts without writing to the database.
STM automation: short_term_memory_enabled disables the update tool and cadence nudge. Existing memory content still renders, allowing manually curated summaries to remain useful. NovelAI does not receive the update tool.

Privacy guards

Triggerer privacy: if the triggering user has PrivacyLevel.FULL, passive STM capture aborts immediately.
Target user privacy: if a target user has PrivacyLevel.PARTIAL or PrivacyLevel.FULL, personal memory creation and updates return a privacy restriction error.
Persona lineage: LTM records are partitioned by persona_lineage_id. Creation is blocked if persona_lineage_id === 0 because zero is reserved for global memories.

Cache invalidation ownership

STM writes: live cache entries update in place before database persistence, so no secondary cache invalidation is required.
Server LTM writes: Both tools invalidate Tomori state after database success. Server creation currently awaits its Discord notification first, so a notification failure can leave cached state stale. Update and deletion invalidate before notification.
Personal LTM writes: both tools call invalidateUserCache(userId) after successful database writes, so subsequent prompt assemblies fetch fresh records.