# polymnemo (remote · polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io)

Shared cross-LLM long-term memory over MCP: semantic recall, sessions, and media (pgvector).

- Trust score: 37/100 (low)
- Change this week: −24
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io`: 37/100 (this document), [markdown](https://verifymcp.io/servers/pcbz-polymnemo/polymnemo.md), [page](https://verifymcp.io/servers/pcbz-polymnemo/polymnemo)

## Channel facts

- Endpoint: `https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.2.7`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-09-20.

- **Endpoint Security**: 92/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - The endpoint enforces authorisation, advertised via RFC 9728 protected-resource metadata.
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server supports Client ID Metadata Documents, the current MCP client-registration mechanism.
- **Transport & Reachability**: 0/100
  - Transport blocked by authentication: the endpoint requires auth we don't have to verify streamable-http.
- **Schema Quality & AI Usability**: 0/100
  - Schema blocked by authentication: the endpoint requires auth we don't have to read it.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 0/100
  - Tool coverage blocked by authentication: the endpoint requires auth we don't have to read its tools.
- **Tool Safety**: 0/100
  - Tool safety blocked by authentication: the endpoint requires auth we don't have to read its tools.
- **Capabilities**: 0/100
  - Capabilities blocked by authentication: the endpoint requires auth we don't have to read them.

**Unverified: 6 categories.** Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### How do I install the polymnemo MCP server?

polymnemo is a hosted endpoint at https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http pcbz-polymnemo 'https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "pcbz-polymnemo": {
      "url": "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pcbz-polymnemo": {
      "type": "http",
      "url": "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.pcbz-polymnemo]
url = "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pcbz-polymnemo": {
      "type": "remote",
      "url": "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pcbz-polymnemo --url 'https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  pcbz-polymnemo:
    url: "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "pcbz-polymnemo": {
      "Transport": "http",
      "Url": "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add pcbz-polymnemo -t streamable-http -u 'https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "pcbz-polymnemo": {
      "type": "http",
      "url": "https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-09-15 (score 37, −24)

- [security regression] Endpoint reachability: reachable → behind authorisation
- [security regression] Stability: 0.13 → unverified
- [security regression] Tool safety: pass → unverified
- [security regression] Transport: pass → unverified
- [security improvement] Authorization: fail → pass
- [security] First check of Authorization: pass
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified
- [functional] First check of Schema quality: unverified

### 2026-09-14 (score 61, 0)

- [functional] Server version: 1.1.3 → 1.1.4

### 2026-09-13 (score 61, +1)

- [functional] Server version: 1.1.1 → 1.1.3

### 2026-09-12 (score 60, 0)

- [functional] Server version: 1.0.1 → 1.1.1

### 2026-09-11 (score 60, +1)

- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 1.0.0 → 1.0.1

### 2026-09-10 (score 59)

First indexed and scored.

## MCP tools (12)

### `ping` (~45 tokens)

Ping

Health / connectivity check.

Returns server identity plus the active pluggable layers, so a client (or
MCP Inspector) can confirm the connection and see how the server is wired.

### `remember` (~92 tokens)

Remember

Store a memory for later semantic recall.

Large content is split into smaller chunks on write (one vector each), so
this may create several ids. `namespace` groups memories (defaults to the
shared namespace); `tags`/`source` are optional metadata.

Returns `{ids, chunks, namespace}`.

Input parameters:

- `content` (string, required)
- `namespace`
- `source`
- `tags`

### `recall` (~110 tokens)

Recall

Search memories by meaning and return the closest matches.

Results are ranked by similarity and bounded by `limit` (default 8). Use the
returned `next_cursor` with `has_more` to page further — you decide whether
the results are enough. `namespace` selects the collection (defaults to the
shared namespace).

Returns `{items, total, has_more, next_cursor}`.

Input parameters:

- `cursor`
- `limit` (integer)
- `namespace`
- `query` (string, required)

### `list_memories` (~74 tokens)

List Memories

List stored memories newest-first (no search query).

\`namespace` selects the collection (defaults to the shared namespace). Page
with `next_cursor` / `has_more`. Returns `{items, total, has_more, next_cursor}`.

Input parameters:

- `cursor`
- `limit` (integer)
- `namespace`

### `get_memory` (~39 tokens)

Get Memory

Fetch a single memory by its id (from `remember`/`recall`/`list_memories`).

Input parameters:

- `id` (string, required)

### `update` (~38 tokens)

Update

Replace a memory's content (re-embeds it). Returns the updated memory.

Input parameters:

- `content` (string, required)
- `id` (string, required)

### `forget` (~32 tokens)

Forget

Delete a memory by id. Returns `{id, deleted}` (deleted=false if absent).

Input parameters:

- `id` (string, required)

### `save_session` (~90 tokens)

Save Session

Persist a session's full content under `session_id` for later reload.

Content is stored as ordered, losslessly-reassemblable chunks (also embedded,
so it's searchable via `recall`). Re-saving the same `session_id` replaces it.
Returns `{session_id, chunks, chars, namespace}`.

Input parameters:

- `content` (string, required)
- `namespace`
- `session_id` (string, required)

### `load_session` (~83 tokens)

Load Session

Reload a saved session's content, one character page at a time.

Page with `page` (0-based) while `has_more` is true. Returns
\`{session_id, content, page, page_size, total_chars, has_more}`.

Input parameters:

- `page` (integer)
- `page_size` (integer)
- `session_id` (string, required)

### `create_upload` (~160 tokens)

Create Upload

Register a file / image / video memory and get a URL to upload its bytes.

The bytes never go through this channel: `description` is embedded so the file
is findable via `recall`. **PUT** the raw bytes to `upload_url` sending
\`upload_headers` (the signed Content-Type). **Then call `confirm_upload`** —
the memory stays hidden from `recall` (and the size cap is enforced) until you
do. Media defaults to a private namespace. Returns
\`{memory_id, object_key, upload_url, upload_headers, content_type, namespace}`.

Input parameters:

- `content_type` (string, required)
- `description` (string, required)
- `filename` (string, required)
- `namespace`

### `confirm_upload` (~86 tokens)

Confirm Upload

Confirm a media upload after you've PUT the bytes.

Verifies the object exists, records its real size + checksum (and rejects an
over-limit upload), then makes the memory findable via `recall` /
downloadable. `id` is from `create_upload`. Returns
\`{memory_id, confirmed, size_bytes, content_type}`.

Input parameters:

- `id` (string, required)

### `get_download_url` (~62 tokens)

Get Download Url

Get a short-lived URL to download a media memory's bytes.

\`id` is the media memory's id (from `create_upload` / `recall`). Returns
\`{memory_id, url, content_type}`.

Input parameters:

- `id` (string, required)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/pcbz-polymnemo/polymnemo#diagnostics

## Score history

- 2026-09-20: 37
- 2026-09-19: 37
- 2026-09-18: 37
- 2026-09-17: 37
- 2026-09-16: 37
- 2026-09-15: 37
- 2026-09-14: 61
- 2026-09-13: 61
- 2026-09-12: 60
- 2026-09-11: 60
- 2026-09-10: 59

## Common questions

### What is the polymnemo MCP server?

polymnemo is an MCP server listed in the public MCP registry as io.github.PCBZ/polymnemo. Shared cross-LLM long-term memory over MCP: semantic recall, sessions, and media (pgvector). This page covers its hosted endpoint (https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp).

### Is the polymnemo MCP server safe to use?

polymnemo scores 37 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the polymnemo MCP server expose?

polymnemo exposes 12 tools: ping, remember, recall, list_memories, get_memory, and 7 more. Their descriptions and schemas cost roughly 911 tokens of context every time the server is loaded.

### Does the polymnemo MCP server require authentication?

Yes. polymnemo asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the polymnemo MCP server still maintained?

polymnemo is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/mcp
- Authorisation metadata: https://polymnemo.purpleground-26f6d744.westus2.azurecontainerapps.io/.well-known/oauth-protected-resource/mcp
- Repository: https://github.com/PCBZ/polymnemo
- Changelog RSS feed: https://verifymcp.io/servers/pcbz-polymnemo/polymnemo.xml
- Changelog JSON feed: https://verifymcp.io/servers/pcbz-polymnemo/polymnemo.json
- HTML version of this page: https://verifymcp.io/servers/pcbz-polymnemo/polymnemo