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LTM 01: Memory Creation

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The memory creation stage handles model-initiated persistence of new facts, preferences, or instructions into the database.

Flow and ownership

Section titled “Flow and ownership”

When the model identifies information worth preserving across conversations, it invokes create_long_term_memory managed by MemoryTool in src/tools/functionCalls/memoryTool.ts.

Execution proceeds through several validation and routing steps:

  1. Parameter validation: checks that memory_content is a non-empty string, that memory_scope is either server_wide or target_user, and that self_teaching_enabled is active in TomoriState.config.
  2. Target user resolution: for target_user scope, resolveUserTarget() (src/utils/discord/targetResolver.ts) matches the requested name against known users and guild members.
    • Ambiguous matches or missing users return an error result to the model.
    • If the target resolves to the bot itself, scope falls back to server_wide.
    • If the target is a Matrix bridge user, {user} is replaced with the bridge user’s display name and scope falls back to server_wide because bridge accounts lack internal user records.
  3. Content sanitization and limits: sanitizeUnknownTemplatePlaceholders() strips unrecognized brace tokens while retaining {user} and {bot}. validateMemoryContent() verifies length against MAX_MEMORY_LENGTH (default 1000 characters).
  4. Privacy enforcement: for personal scope, userRepository.getPrivacyLevel() inspects the target user. If the user configured PrivacyLevel.PARTIAL or PrivacyLevel.FULL, creation halts with a privacy restriction notice.
  5. Lineage guard: persona lineage ID 0 is rejected because zero is reserved for global memories.
  6. Atomic capacity and persistence: both scopes call their repository’s addWithEviction. Under an owner lock, the repository recounts the scope against MAX_SERVER_MEMORIES or MAX_PERSONAL_MEMORIES (both default to 100). Personal counts include global rows. Below the cap it inserts normally; at the cap, enabled decay with available RAG and resolved embedding credentials and model for the turn permits replacing the least recently reinforced dormant memory without manual protection in that exact lineage. Never-reinforced rows come first, with creation time and ID breaking ties. Memories added or edited through /memories or /personal memories and Global personal rows are protected; imported and pre-release rows remain eligible. If retrieval prerequisites are missing or no eligible row exists, the save is refused. Deletion and insertion share one transaction, so a failed save preserves the old memory.
  7. Cache invalidation and notification: both scopes invalidate their existing state cache after successful persistence, before sending the confirmation. Notification failure is non-fatal. Eviction confirmations include saved and forgotten content and follow the memory-notice visibility setting. Hidden notices go to the thought log; Minimal notices show only the title in conversation and mirror the full card to the thought log when configured. Expanded content exceeding Discord’s embed limit is delivered as an ephemeral notice.txt attachment.

Ordinary saves return memory_saved_successfully with the new memory ID. Replacement saves return memory_saved_with_eviction and content_forgotten, so the model also receives the removed text. Each eviction emits memory_eviction to both metric sinks with only scope (server or personal) and decay_days. Model saves set manually_written = false. Adds and edits through /memories and /personal memories set it to true, including saves that only change channels or tags and saves of unchanged, previously unprotected content. This protection does not change dormancy.

Stable proxy identities retain personal memory scope because they own synthetic user rows. Creation and updates also check all linked hosts through getMessageProxyHostProtection(). Full host privacy, a server blacklist, or unresolved host links block writes. A new identity may receive a one-time public bio snapshot under lineage 0 through bioSeeding.ts; it uses the same host guard and invalidates cache only after a successful write. See message-proxy integration.

Constraints and rationale

Section titled “Constraints and rationale”
  • Lineage isolation: records are partitioned by persona_lineage_id. Personas sharing a character lineage share memories, while distinct character lineages remain isolated.
  • Cache invalidation ordering: Both scopes invalidate after database success and before notification, so a Discord failure cannot leave the saved state stale.
  • Capacity controls: limits defined in src/utils/misc/memoryLimits.ts prevent database bloat and control token consumption during prompt construction.

Source pointers

Section titled “Source pointers”
  • src/tools/functionCalls/memoryTool.ts: MemoryTool parameter validation, scope resolution, and execution flow.
  • src/utils/discord/targetResolver.ts: user name matching and bridge fallback handling.
  • src/utils/db/repositories/ServerMemoryRepository.ts: queries and limit verification for server memories.
  • src/utils/db/repositories/PersonalMemoryRepository.ts: queries and limit verification for personal memories.
  • src/utils/cache/tomoriStateCache.ts and src/utils/cache/userCache.ts: cache invalidation functions.