HoldKit
REMOTE · HOLDKIT.PEERFOUNDRY.AI
Idempotency keys, locks, timers, and inboxes for agents over MCP. No payments.
Available components
Last scanned (2 hours ago)
Scores higher than 52% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Workflow Automation
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. How we score → Why this is hard to score →
Endpoint Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (inbox.ack). See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability72
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (fair).Partial
- Tool/resource definitions use about 734 tokens (~48/item across 15 items; 14 tools + 1 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management17
- Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (2026-07-28).Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +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.
- 4 Nov 26 +4
- 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 security
- Schema quality: 36 → 48 ▼ functional
- The server now declares the “resources” capability functional
- First check of Schema quality: 100 functional
- New resource “recipe” functional
- 2 Nov 26 +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.
- 1 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- 31 Oct 26 60
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://holdkit.peerfoundry.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=peerfoundry.ai | CN=WE1,O=Google Trust Services,C=US | 31 Oct 2026 | 29 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | 75be6c5a6643926613ffd8060e9980ae |
| SANs: peerfoundry.ai, holdkit.peerfoundry.ai, *.holdkit.peerfoundry.ai | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of holdkit.peerfoundry.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 1814, 3799 | 8, 8 | Verified |
| peerfoundry.ai. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=86400; includeSubDomains |
| x-content-type-options | nosniff |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://holdkit.peerfoundry.ai/mcp | Verified | 200 | |
| http (plaintext) | http://holdkit.peerfoundry.ai/mcp | HTTPS enforced | 301 | https://holdkit.peerfoundry.ai/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
idem.begin Begin idempotency ~69
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.
| Name | Type | Req | Description |
|---|---|---|---|
| fingerprint | string | yes | – |
| key | string | yes | – |
| scope | string | yes | – |
| ttl_s | integer | – | – |
No output schema declared.
No examples provided.
idem.commit Commit idempotency ~85
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.
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | – |
| owner | string | – | – |
| result_ref | string | yes | – |
| scope | string | – | – |
No output schema declared.
No examples provided.
inbox.ack Ack inbox ~44
Mark inbox events done. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| event_ids | array | yes | – |
| inbox_id | string | yes | – |
No output schema declared.
No examples provided.
inbox.create Create inbox ~34
Create an inbox. Returns webhook and A2A URLs. Call keys.create once. Pass the key on every tools/call.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
inbox.poll Poll inbox ~51
Read inbox events after a cursor. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| cursor | integer | – | – |
| inbox_id | string | yes | – |
| limit | integer | – | – |
No output schema declared.
No examples provided.
inbox.wait Wait inbox ~69
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.
| Name | Type | Req | Description |
|---|---|---|---|
| block_ms | integer | – | – |
| cursor | integer | – | – |
| inbox_id | string | yes | – |
No output schema declared.
No examples provided.
keys.create Create caller key ~38
Mint a pf_ caller key bound to one HoldKit namespace. The raw key is shown once. Pass this key on every later tools/call.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
kv.delete Delete value ~33
Delete a value. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | – |
No output schema declared.
No examples provided.
kv.get Get value ~34
Read a small value. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | – |
No output schema declared.
No examples provided.
kv.set Set value ~59
Write a small value with a TTL. Emails and card numbers are rejected. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| key | string | yes | – |
| ttl_s | integer | yes | – |
| value | string | yes | – |
No output schema declared.
No examples provided.
lock.acquire Acquire lock ~54
Take a lease lock. Returns a fencing token. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| name | string | yes | – |
| owner | string | – | – |
| ttl_s | integer | yes | – |
No output schema declared.
No examples provided.
lock.release Release lock ~44
Release a lock with its fencing token. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| fencing | integer | yes | – |
| name | string | yes | – |
No output schema declared.
No examples provided.
timer.cancel Cancel timer ~34
Cancel a timer. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| timer_id | string | yes | – |
No output schema declared.
No examples provided.
timer.set Set timer ~64
Schedule a durable timer. Delivery URLs must be public https. Call keys.create once. Pass the key on every tools/call.
| Name | Type | Req | Description |
|---|---|---|---|
| delay_s | integer | yes | – |
| inbox_id | string | – | – |
| payload | string | yes | – |
| url | string | – | – |
No output schema declared.
No examples provided.
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.
remote · holdkit.peerfoundry.ai
claude mcp add --transport http ai-peerfoundry-holdkit 'https://holdkit.peerfoundry.ai/mcp'
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.