# HoldKit (remote · holdkit.peerfoundry.ai)

Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.

- Trust score: 66/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `holdkit.peerfoundry.ai`: 66/100 (this document), [markdown](https://verifymcp.io/servers/ai-peerfoundry-holdkit/holdkit.md), [page](https://verifymcp.io/servers/ai-peerfoundry-holdkit/holdkit)

## Channel facts

- Endpoint: `https://holdkit.peerfoundry.ai/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## 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 2026-11-05.

- **Endpoint Security**: 63/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (inbox.ack).
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 72/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (fair).
  - Tool/resource definitions use about 734 tokens (~48/item across 15 items; 14 tools + 1 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 17/100
  - Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 67/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 0% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

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

HoldKit is a hosted endpoint at https://holdkit.peerfoundry.ai/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 ai-peerfoundry-holdkit 'https://holdkit.peerfoundry.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ai-peerfoundry-holdkit": {
      "url": "https://holdkit.peerfoundry.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ai-peerfoundry-holdkit": {
      "type": "http",
      "url": "https://holdkit.peerfoundry.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ai-peerfoundry-holdkit]
url = "https://holdkit.peerfoundry.ai/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-peerfoundry-holdkit": {
      "type": "remote",
      "url": "https://holdkit.peerfoundry.ai/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ai-peerfoundry-holdkit --url 'https://holdkit.peerfoundry.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ai-peerfoundry-holdkit:
    url: "https://holdkit.peerfoundry.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ai-peerfoundry-holdkit": {
      "Transport": "http",
      "Url": "https://holdkit.peerfoundry.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ai-peerfoundry-holdkit -t streamable-http -u 'https://holdkit.peerfoundry.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ai-peerfoundry-holdkit": {
      "type": "http",
      "url": "https://holdkit.peerfoundry.ai/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.

### 2026-11-05 (score 66, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-04 (score 65, +4)

- [security] Tool “idem.begin” rewrote its description, which is the text the model reads
- [security] Tool “idem.commit” rewrote its description, which is the text the model reads
- [security] Tool “inbox.ack” rewrote its description, which is the text the model reads
- [security] Tool “inbox.create” rewrote its description, which is the text the model reads
- [security] Tool “inbox.poll” rewrote its description, which is the text the model reads
- [security] Tool “inbox.wait” rewrote its description, which is the text the model reads
- [security] Tool “keys.create” rewrote its description, which is the text the model reads
- [security] Tool “kv.delete” rewrote its description, which is the text the model reads
- [security] Tool “kv.get” rewrote its description, which is the text the model reads
- [security] Tool “kv.set” rewrote its description, which is the text the model reads
- [security] Tool “lock.acquire” rewrote its description, which is the text the model reads
- [security] Tool “lock.release” rewrote its description, which is the text the model reads
- [security] Tool “timer.cancel” rewrote its description, which is the text the model reads
- [security] Tool “timer.set” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 36 → 48
- [functional] The server now declares the “resources” capability
- [functional] First check of Schema quality: 100
- [functional] New resource “recipe”

### 2026-11-02 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-01 (score 60, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-31 (score 60)

First indexed and scored.

## MCP tools (14)

### `keys.create` (~38 tokens)

Create caller key

Mint a pf_ caller key bound to one HoldKit namespace. The raw key is shown once. Pass this key on every later tools/call.

### `inbox.create` (~34 tokens)

Create inbox

Create an inbox. Returns webhook and A2A URLs. Call keys.create once. Pass the key on every tools/call.

### `inbox.poll` (~51 tokens)

Poll inbox

Read inbox events after a cursor. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `cursor` (integer)
- `inbox_id` (string, required)
- `limit` (integer)

### `inbox.ack` (~44 tokens)

Ack inbox

Mark inbox events done. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `event_ids` (array, required)
- `inbox_id` (string, required)

### `inbox.wait` (~69 tokens)

Wait inbox

Poll an inbox. block_ms is accepted and capped at 0 in this MVP, so the call returns current events. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `block_ms` (integer)
- `cursor` (integer)
- `inbox_id` (string, required)

### `timer.set` (~64 tokens)

Set timer

Schedule a durable timer. Delivery URLs must be public https. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `delay_s` (integer, required)
- `inbox_id` (string)
- `payload` (string, required)
- `url` (string)

### `timer.cancel` (~34 tokens)

Cancel timer

Cancel a timer. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `timer_id` (string, required)

### `lock.acquire` (~54 tokens)

Acquire lock

Take a lease lock. Returns a fencing token. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `name` (string, required)
- `owner` (string)
- `ttl_s` (integer, required)

### `lock.release` (~44 tokens)

Release lock

Release a lock with its fencing token. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `fencing` (integer, required)
- `name` (string, required)

### `idem.begin` (~69 tokens)

Begin idempotency

Start an idempotency key or return the prior outcome. fingerprint is a hex hash. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `fingerprint` (string, required)
- `key` (string, required)
- `scope` (string, required)
- `ttl_s` (integer)

### `idem.commit` (~85 tokens)

Commit idempotency

Store the outcome reference for an idempotency key. scope (max 64) and owner are optional. When owner is omitted, the caller key hash is sent. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `key` (string, required)
- `owner` (string)
- `result_ref` (string, required)
- `scope` (string)

### `kv.get` (~34 tokens)

Get value

Read a small value. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `key` (string, required)

### `kv.set` (~59 tokens)

Set value

Write a small value with a TTL. Emails and card numbers are rejected. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `key` (string, required)
- `ttl_s` (integer, required)
- `value` (string, required)

### `kv.delete` (~33 tokens)

Delete value

Delete a value. Call keys.create once. Pass the key on every tools/call.

Input parameters:

- `key` (string, required)

## Diagnostics

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

## Score history

- 2026-11-05: 66
- 2026-11-04: 65
- 2026-11-03: 61
- 2026-11-02: 61
- 2026-11-01: 60
- 2026-10-31: 60

## Common questions

### What is the HoldKit MCP server?

HoldKit is an MCP server listed in the public MCP registry as ai.peerfoundry/holdkit. Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments. This page covers its hosted endpoint (https://holdkit.peerfoundry.ai/mcp).

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

HoldKit scores 66 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 HoldKit MCP server expose?

HoldKit exposes 14 tools: keys.create, inbox.create, inbox.poll, inbox.ack, inbox.wait, and 9 more. Their descriptions and schemas cost roughly 712 tokens of context every time the server is loaded.

### Does the HoldKit MCP server require authentication?

No. We connected to HoldKit without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the HoldKit MCP server still maintained?

HoldKit is still listed as active in the MCP registry. We last reached this channel on 5 November 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://holdkit.peerfoundry.ai/mcp
- Website: https://peerfoundry.ai/
- Changelog RSS feed: https://verifymcp.io/servers/ai-peerfoundry-holdkit/holdkit.xml
- Changelog JSON feed: https://verifymcp.io/servers/ai-peerfoundry-holdkit/holdkit.json
- HTML version of this page: https://verifymcp.io/servers/ai-peerfoundry-holdkit/holdkit