About Papez
Papez is an MCP server published by Astrix-Labs in the RAG category: open-source causal graph memory for AI agents. 85.55 on LoCoMo under a frozen, reproducible protocol. MCP server with ACT-R scoring, spreading activation, and active forgetting.
The repository has 31 stars and 5 forks, with the last commit 4 days ago. Recent commit activity is the strongest signal that reported issues will get attention.
Install
uvx papezpip install papezgit clone https://github.com/Astrix-Labs/papezThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Tools (24)
delete_memoryPermanently delete a memory (writer+ for space memories)
Parameters not published.
list_core_memoriesList core memories, optionally filtered by category. Optional `space`.
Parameters not published.
memory_amendRecord a correction: creates a new memory that **supersedes** an existing one. The old memory is kept (decayed in recall), not deleted. Optional `refs` / `tags` (omitted: copied from the old memory; given: replace). Stays in the old memory's space.
Parameters not published.
memory_explainExplain a memory's score. Includes a `score_model` block (formula + live per-force breakdown + staleness note), `removal_impact`, and the memory's `refs`, `tags`, `space`.
Parameters not published.
memory_recallRecall memories by natural language query (vector + keyword + graph spreading activation). Supports `verbosity: "concise"` or `"light"` for lightweight payloads. Optional `tags_any`, `ref_type`, `space`, `spaces`, `include_personal`, `category`, `exclude_superseded`.
Parameters not published.
memory_retire_by_refRetire the memories citing a removed source (`ref_type`, `ref_id`). `mode="amend"` (default) or `"delete"`. Optional `space`.
Parameters not published.
memory_searchFiltered vector search by status, category, date (`since`), last-active date (`active_since`), entity, and now `tags_any`, `tags_all`, `ref_type`, `ref_id`. Pass an **empty query** to enumerate by recency instead (no embedder needed) — with `since`/`active_since` this answers "what's new since I last looked" without knowing what to query for. Optional `space`, `spaces`, `include_personal`.
Parameters not published.
memory_statsGet memory system statistics over what you can see. Optional `space`.
Parameters not published.
memory_storeStore a new memory. Use `related` for writer-specified **typed** edges (`{id, type}`); `related_to` is legacy and always creates `caused_by`. Optional `category`, `refs`, `tags`, `space`, `external_id`, `on_existing` (`amend` default, `skip`, `error`). May return `possible_conflicts` (heuristic hints).
Parameters not published.
memory_store_batchStore up to 100 memories into one space in one call. Validates every item first (all or nothing), supports `ref_index` links to earlier items, returns one result per item. Safe to retry when every item has an `external_id`.
Parameters not published.
Show all 24 tools
memory_traverseWalk the causal graph from a node. Returns reachable **nodes and the edges** of the induced subgraph (`source/target/type/weight/created_by`) — a superset of the BFS tree, so paths can be reconstructed. Honors `edge_types`. Optional `space`, `spaces`, `include_personal`. An invisible start node returns `not_found`.
Parameters not published.
pin_memoryPin a memory so it's never forgotten (writer+ for space memories)
Parameters not published.
promote_to_orgPromote a private memory to org visibility (not for space memories)
Parameters not published.
promote_to_spaceCopy one of your personal memories into a space (writer+). Optional `keep_original`.
Parameters not published.
set_core_preferencesSet user preferences for core memory categories
Parameters not published.
space_createCreate a Mind Space; you become its owner. `name`, optional `slug`, `org_id`, `description`, `forgetting_policy`, `llm_inference_enabled`, `show_service_names`.
Parameters not published.
space_erasePermanently delete a space and everything in it (owner, `confirm_slug`, optional `dry_run`)
Parameters not published.
space_getOne space, with member and memory counts (reader+)
Parameters not published.
space_listList your spaces with your role and counts. Optional `include_archived`.
Parameters not published.
space_member_addAdd a user or service with a role, or change an existing member's role (owner)
Parameters not published.
space_member_listList members (reader+)
Parameters not published.
space_member_removeRemove a member (owner; the last user owner can't be removed)
Parameters not published.
space_updateChange name, description, `forgetting_policy`, `llm_inference_enabled`, `show_service_names` (owner)
Parameters not published.
unpin_memoryUnpin a previously pinned memory (writer+ for space memories)
Parameters not published.
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