# ColdState — Deterministic Knowledge Infrastructure (remote · cold-api.coldstate.ai)

Deterministic knowledge for AI agents: search, fetch, cite and verify a 48M-entry knowledge base.

- Trust score: 76/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-05

## Components

- remote · `cold-api.coldstate.ai`: 76/100 (this document), [markdown](https://verifymcp.io/servers/ai-coldstate-knowledge/cold-api.md), [page](https://verifymcp.io/servers/ai-coldstate-knowledge/cold-api)

## Channel facts

- Endpoint: `https://cold-api.coldstate.ai/mcp`
- Transports: `streamable-http`
- Auth: `required`
- 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 2026-10-05.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - 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**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 1226 tokens (~76/item across 16 items; 16 tools + 0 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**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% 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.
  - We read all 16 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the ColdState — Deterministic Knowledge Infrastructure MCP server?

ColdState — Deterministic Knowledge Infrastructure is a hosted endpoint at https://cold-api.coldstate.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-coldstate-knowledge 'https://cold-api.coldstate.ai/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ai-coldstate-knowledge": {
      "url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ai-coldstate-knowledge": {
      "type": "http",
      "url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ai-coldstate-knowledge]
url = "https://cold-api.coldstate.ai/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ai-coldstate-knowledge": {
      "type": "remote",
      "url": "https://cold-api.coldstate.ai/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ai-coldstate-knowledge --url 'https://cold-api.coldstate.ai/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ai-coldstate-knowledge:
    url: "https://cold-api.coldstate.ai/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ai-coldstate-knowledge": {
      "Transport": "http",
      "Url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ai-coldstate-knowledge -t streamable-http -u 'https://cold-api.coldstate.ai/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ai-coldstate-knowledge": {
      "type": "http",
      "url": "https://cold-api.coldstate.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.

### 2026-10-04 (score 76, +1)

No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-02 (score 75, +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.

### 2026-10-01 (score 74, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-30 (score 74)

First indexed and scored.

## MCP tools (16)

### `coldstate_search` (~134 tokens)

Search a ColdState index by collection name or index ID. Returns ranked results with Ψ scores and state classification (CRYSTALLINE/FLUID/REACTIVE/DECOHERENT). Provide exactly one of `collection` or `index_id`.

Input parameters:

- `collection` (string): Collection name to search (mutually exclusive with index_id)
- `index_id` (string): Index ID to search, e.g. idx_... (mutually exclusive with collection)
- `limit` (integer): Max results to return
- `offset` (integer): Offset for pagination
- `query` (string, required): The search query

### `coldstate_list_indexes` (~29 tokens)

List all your ColdState indexes with their status, mode, document count, and domain preset.

### `coldstate_browse_documents` (~93 tokens)

Browse documents in a ColdState index. Indexes are zero-knowledge, so each document is returned as your ref_id plus its state classification and E-score — no stored text. Map ref_id back to your own content.

Input parameters:

- `index_id` (string, required): Index ID, e.g. idx_...
- `limit` (integer): Max documents to return
- `offset` (integer): Offset for pagination

### `coldstate_explain` (~88 tokens)

Explain why a specific document ranked for a query. Returns a per-term relevance breakdown and an overall match summary — deterministic and reproducible.

Input parameters:

- `doc_id` (string, required): Document ID, e.g. "doc_42" or "42"
- `index_id` (string, required): Index ID, e.g. idx_...
- `query` (string, required): The search query to explain against

### `coldstate_search_global` (~129 tokens)

Search ColdState's global knowledge base (48.4M+ entries across 35 domains including SCIENCE, MEDICINE, TECHNOLOGY, HISTORY, etc). Returns deterministically ranked results with Ψ relevance scores and a state classification. Optionally filter by domain.

Input parameters:

- `domain` (string): Filter by knowledge domain (e.g. MEDICINE, SCIENCE, TECHNOLOGY, HISTORY, LAW, CODE). Case-insensitive.
- `limit` (integer): Max results to return
- `offset` (integer): Offset for pagination
- `query` (string, required): The search query

### `coldstate_domains` (~25 tokens)

List all available knowledge domains in ColdState's global knowledge base with entry counts.

### `coldstate_fetch` (~79 tokens)

Fetch a single knowledge-base entry verbatim by its stable id (e.g. "eng_000229f438f7cebd"). Deterministic retrieval — returns the full record plus a content_hash and kb_snapshot for reproducible citation.

Input parameters:

- `id` (string, required): Stable knowledge entry id, e.g. eng_... or soc_...

### `coldstate_cite` (~63 tokens)

Get a canonical, reproducible citation for a knowledge entry by id (title, domain, source, content_hash, kb_snapshot). Cite a fact so it can be re-verified later with coldstate_verify.

Input parameters:

- `id` (string, required): Stable knowledge entry id

### `coldstate_verify` (~81 tokens)

Verify a previously-cited knowledge fact is unchanged. Provide the entry id and the content_hash you stored earlier; returns whether it still matches the current knowledge base. The trust primitive for AI-to-AI fact-checking.

Input parameters:

- `content_hash` (string, required): The content_hash from a previous fetch/cite
- `id` (string, required): Stable knowledge entry id

### `coldstate_snapshot` (~38 tokens)

Get the current knowledge-base snapshot/version id. Pin this kb_snapshot for reproducibility: the same query against the same kb_snapshot returns identical results.

### `coldstate_related` (~87 tokens)

Find knowledge entries deterministically related to a given entry id via ColdState's concept-cluster graph. Returns same-cluster and neighboring-cluster entries, each tagged with its relation and a cross_domain flag. Same id ⇒ same neighbors.

Input parameters:

- `id` (string, required): Stable knowledge entry id, e.g. eng_... or soc_...
- `limit` (integer): Max related entries

### `coldstate_resolve` (~94 tokens)

Resolve a name, alias, or surface form to its canonical ColdState knowledge entry (id + title). Deterministic: an exact title match wins, else the top relevance-Ψ entry. Returns the canonical entry plus alternatives. Use the returned id with coldstate_fetch / coldstate_related.

Input parameters:

- `limit` (integer): Max alternative candidates
- `query` (string, required): The name/term/alias to resolve

### `coldstate_batch_search` (~80 tokens)

Run several knowledge-base queries in one call against a single consistent kb_snapshot. Returns each query with its ranked results — efficient and snapshot-consistent across the whole batch.

Input parameters:

- `domain` (string): Optional domain filter applied to all queries
- `limit` (integer): Max results per query
- `queries` (array, required): 1–10 queries

### `coldstate_stats` (~71 tokens)

Deterministic statistics. With a `query`: total matches + state distribution of the top results. Without: global knowledge-base stats (entry count, domains, snapshot).

Input parameters:

- `domain` (string): Optional domain filter (with query)
- `query` (string): Optional query to get coverage/state stats for

### `coldstate_capabilities` (~42 tokens)

Machine-readable manifest of this server: available tools, knowledge domains, current kb_snapshot, determinism guarantees, and limits. Call this first to self-configure.

### `coldstate_isomorph` (~93 tokens)

Cross-domain structural analog: given a knowledge entry id, find its closest structural twin in each OTHER domain ("same structure, different domain"). Deterministic. Use coldstate_resolve to turn a name into an id first.

Input parameters:

- `id` (string, required): Stable knowledge entry id, e.g. eng_... or soc_...
- `limit` (integer): Max cross-domain analogs (one per domain)

## Diagnostics

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

## Score history

- 2026-10-05: 76
- 2026-10-04: 76
- 2026-10-03: 75
- 2026-10-02: 75
- 2026-10-01: 74
- 2026-09-30: 74

## Common questions

### What is the ColdState — Deterministic Knowledge Infrastructure MCP server?

ColdState — Deterministic Knowledge Infrastructure is an MCP server listed in the public MCP registry as ai.coldstate/knowledge. Deterministic knowledge for AI agents: search, fetch, cite and verify a 48M-entry knowledge base. This page covers its hosted endpoint (https://cold-api.coldstate.ai/mcp).

### Is the ColdState — Deterministic Knowledge Infrastructure MCP server safe to use?

ColdState — Deterministic Knowledge Infrastructure scores 76 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 ColdState — Deterministic Knowledge Infrastructure MCP server expose?

ColdState — Deterministic Knowledge Infrastructure exposes 16 tools: coldstate_search, coldstate_list_indexes, coldstate_browse_documents, coldstate_explain, coldstate_search_global, and 11 more. Their descriptions and schemas cost roughly 1,226 tokens of context every time the server is loaded.

### Does the ColdState — Deterministic Knowledge Infrastructure MCP server require authentication?

No. We connected to ColdState — Deterministic Knowledge Infrastructure without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the ColdState — Deterministic Knowledge Infrastructure MCP server still maintained?

ColdState — Deterministic Knowledge Infrastructure is still listed as active in the MCP registry. We last reached this channel on 5 October 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://cold-api.coldstate.ai/mcp
- Authorisation metadata: https://cold-api.coldstate.ai/.well-known/oauth-protected-resource/mcp
- Website: https://services.coldstate.ai/
- Changelog RSS feed: https://verifymcp.io/servers/ai-coldstate-knowledge/cold-api.xml
- Changelog JSON feed: https://verifymcp.io/servers/ai-coldstate-knowledge/cold-api.json
- HTML version of this page: https://verifymcp.io/servers/ai-coldstate-knowledge/cold-api