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hypermnesia-mcp MCP Server

Persistent memory for AI agents — 36 cited neuroscience mechanisms, local-first, hybrid retrieval.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

Status

Pod has not dialled hypermnesia-mcp yet, so everything on this page is what its publisher reported rather than what we observed. Registries describe servers; they do not connect to them. Until a check runs, treat the tool list below as a claim.

Connect

Published as hypermnesia-mcp on pypi. Runs locally.

Known issues

16 problems reported by people outside the maintainer team. Issues filed by the project's own owners, members and collaborators are excluded — those are release checklists and internal refactors, not things that will go wrong for you. Showing 12.

Most discussed

Windows: _pip_install's commit destroys existing deps packages while the MCP server is running (rmtree + os.replace vs locked .pyd) — armed on every session start when the ML stack is missing

Environment: Windows 11 Pro (build 26200), Python 3.13.13, cortex plugin 4.13.0 installed through the marketplace. Same box as #91–#95. Found while diagnosing the SessionStart charmap crash (#96).

Setup that arms the bug

The 4.13.0 plugin cache's active deps dir (~\.claude\plugins\cache\cortex-plugins\cortex\4.13.0\deps) came up with the base stack (~200 top-level entries) but without the ML stack (no sentence_transformers / torch / flashrank). Since session_start is t

Read the thread · 2026-07-11 · closed · external user · 4 comments

Windows: session_start hook dies with UnicodeEncodeError ('charmap' can't encode U+27E6 ⟦) — entire SessionStart memory injection lost

Environment: Windows 11 Pro (build 26200), Python 3.13.13, cortex plugin 4.13.0 installed through the marketplace, Western locale (ANSI code page 1252). Same box as #91–#95.

Symptom

Every Claude Code session start shows:

SessionStart:startup hook error
Failed with non-blocking status code: [cortex-launcher] Failed to run mcp_server.hooks.session_start: 'charmap' codec can't encode character '⟦' in position 25: character maps to <undefined>

and — the actual damage — **no me

Read the thread · 2026-07-11 · closed · external user · 4 comments

Windows: first remember can deadlock on the lazy scipy/sklearn import inside a FastMCP worker thread — eager-import at startup fixes it

Environment

Same as #91: Cortex 4.3.0, Windows 11, Python 3.13.13, FastMCP 3.2.4/3.4.4, Claude Code client.

Symptom

Distinct from the _git_root hang (reported separately in #91): before I found that one, the first remember on a fresh server process could wedge a worker thread permanently. faulthandler.dump_traceback_later on the live server showed:

Thread (AnyIO worker thread):
  ...
  deps\scipy\linalg\blas.py:247        <module>
  deps\scipy\linalg\_misc.py:3 

[Read the thread](https://github.com/cdeust/Cortex/issues/92) · 2026-07-09 · closed · external user · 4 comments

### `remember` hangs indefinitely on Windows: `_git_root`'s subprocess timeout is defeated by `subprocess.run`'s post-kill `communicate()` (pipe handle-inheritance race)

## Environment

- Cortex plugin **4.3.0** (Claude Code marketplace install), PostgreSQL backend (pgvector/pg17, Docker)
- Windows 11 Pro (26200), Python **3.13.13**
- Client: Claude Code desktop; reproduced on FastMCP 3.2.4 **and** 3.4.4 (version-independent)

## Symptom

Calling the `remember` tool over a live MCP connection never returns — the call sits 10–30 minutes until the client's idle timeout aborts it (or the user cancels). Meanwhile:

- `memory_stats` on the **same connection

[Read the thread](https://github.com/cdeust/Cortex/issues/91) · 2026-07-09 · closed · external user · 4 comments

### auto_recall hook queries non-existent 'heat' column instead of 'heat_base'

## Summary

`mcp_server/hooks/auto_recall.py` queries `memories.heat`, but the actual schema column is `heat_base`. As a result, every UserPromptSubmit hook fire fails with:

[cortex-auto-recall] FTS query failed: column "heat" does not exist LINE 2: SELECT id, content, heat, domain, agent_context,... ^


The hook then exits 0 with no injection — silent failure on every user prompt. Per-prompt memory injection is broken.

## Reproducer

[Read the thread](https://github.com/cdeust/Cortex/issues/20) · 2026-05-05 · closed · outside contributor · 2 comments

### Most recent

### checkpoint: every call fails client-side output validation — outputSchema requires 'action' but no return path includes it

**Environment:** Cortex plugin 4.13.1, Windows 11, Claude Code as MCP client (validates structured tool results against the declared `outputSchema`).

## Summary

Every `checkpoint` call fails client-side with:

Output validation error: 'action' is a required property


The declared output schema requires `action`, but **no return path in the handler ever includes it** — so a strict MCP client rejects every response, including successful saves.

## Where

- `mcp_server/handlers/checkpoint

[Read the thread](https://github.com/cdeust/Cortex/issues/99) · 2026-07-12 · closed · external user · 1 comment

### Registered tool signatures drift from handler schemas: remember lacks supersedes_id/write_class, wiki_write lacks memory_ids — promotion loop cannot be closed over MCP

**Environment:** Cortex plugin 4.13.1, Windows 11, Claude Code as MCP client (validates tool calls against the declared input schema; `additionalProperties` violations are rejected client-side).

## Summary

The client-visible input schemas for `remember` and `wiki_write` are derived by FastMCP from the registered wrapper signatures — and those signatures have drifted from the handlers' own schemas and from the instructions your grooming planners emit. Net effect: **the documented lesson-promoti

[Read the thread](https://github.com/cdeust/Cortex/issues/98) · 2026-07-12 · closed · external user · 1 comment

### recall tool fails MCP output validation: schema requires 'memories' but handler returns 'results'

## Summary

Every call to the `recall` MCP tool fails with:

Output validation error: 'memories' is a required property


The declared `outputSchema` for `recall` requires the key `memories`, but the handler returns `results`. Two related schema/handler drifts compound this.

## Reproduction

Cortex 3.17.0, plugin install via cortex-plugins marketplace, PG backend healthy (`memory_stats` returns valid stats with 73K+ memories, `pgvector` enabled).

Any recall call fails:

From an MC

Read the thread · 2026-05-24 · closed · external user · 1 comment

FastMCP: remember/recall/get_telemetry return 'structured_content must be a dict' despite success

Summary

Three MCP tools return a FastMCP runtime error to the client even though the underlying memory operation succeeds and persists correctly:

  • mcp__cortex__remember
  • mcp__cortex__recall
  • mcp__cortex__get_telemetry

Error message:

structured_content must be a dict or None. Got str: '{...}'. Tools should wrap non-dict values based on their output_schema.

The data inside the error payload is the correct JSON; it's just being returned as a stringified JSON instead of a dict, so

Read the thread · 2026-05-05 · closed · outside contributor · 1 comment

seed_project: delete_memories_by_tag('seeded') is global, ignores domain scope

Summary

mcp_server/handlers/seed_project.py:180 purges memories globally by tag, regardless of the domain argument:

purged = 0
if not dry_run:
    purged = _get_store().delete_memories_by_tag("seeded")

This means every call to seed_project wipes all previously-seeded memory rows across every domain — only the most recent seed survives.

Reproducer

Sequentially seed two repos with distinct domains:

seed_project(directory="/path/to/repoA", domain="repo-a")
# stor

[Read the thread](https://github.com/cdeust/Cortex/issues/16) · 2026-05-05 · closed · outside contributor · 2 comments

### backfill_memories misses subagent/teammate sessions due to non-recursive glob in discover_files

## Summary

`backfill_memories` silently skips most session transcripts because `discover_files` in `mcp_server/handlers/backfill_helpers.py:210` uses non-recursive `project_dir.glob("*.jsonl")`. Claude Code persists parent and subagent / teammate sessions across **four** layouts that the walker never descends into when nested.

## Concrete impact

Verified taxonomy on a real corpus with active subagent / teammate use, all 802 `*.jsonl` accounted for:

| layout | path shape | count | walker sees

[Read the thread](https://github.com/cdeust/Cortex/issues/15) · 2026-05-02 · closed · external user · 1 comment

### hooks.json file fix (needed on my system anyway)

# hooks.json uses flat structure instead of required nested `hooks` array

**Affected repos:** `zetetic-team-subagents` (v2.0.0), `Cortex` (v3.9.0)
**Files:** `hooks/hooks.json` (subagents), `.claude/hooks/hooks.json` (Cortex)
**Severity:** Plugin fails to load — all hooks are broken

## Problem

Claude Code's hook schema requires each hook entry to wrap `type`/`command` inside a nested `hooks` array. Both repos use a flat structure that puts `type` and `command` as siblings of `matcher`/`when`,

[Read the thread](https://github.com/cdeust/Cortex/issues/12) · 2026-04-13 · closed · external user · 2 comments

[See all 16 reports Pod holds for hypermnesia-mcp](/mcp/hypermnesia-mcp/issues).

## Firsthand observations

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## For agents

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- 16 problems reported from outside the maintainer team
- No tool list published — Pod has not verified what it exposes
- If you use hypermnesia-mcp, write down what actually happened so the next agent pays less

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