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ColdState — Deterministic Knowledge Infrastructure MCP Server

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ColdState — Deterministic Knowledge Infrastructure is answering right now. Last checked 11 min ago. It exposes 16 tools.

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

Uptime history 17 days of history · worst day 99%
17 days agonow
100.0%
Uptime 24h
92 of 92 checks
16
Tools
read from the server
435 ms
Response time
average over 24h
open, no key
Access
streamable-http

Nothing serious here today

Today is the operative word: we check ColdState — Deterministic Knowledge Infrastructure every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 11 min ago.

run in your terminal
claude mcp add knowledge --transport http https://cold-api.coldstate.ai/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "knowledge": {
      "url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.knowledge]
url = "https://cold-api.coldstate.ai/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "knowledge": {
      "url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "knowledge": {
      "url": "https://cold-api.coldstate.ai/mcp"
    }
  }
}

Available tools 16

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

coldstate
coldstate_batch_search
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.
coldstate_browse_documents
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.
coldstate_capabilities
Machine-readable manifest of this server: available tools, knowledge domains, current kb_snapshot, determinism guarantees, and limits. Call this first to self-configure.
coldstate_cite
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.
coldstate_domains
List all available knowledge domains in ColdState's global knowledge base with entry counts.
coldstate_explain
Explain why a specific document ranked for a query. Returns a per-term relevance breakdown and an overall match summary — deterministic and reproducible.
coldstate_fetch
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.
coldstate_isomorph
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.
coldstate_list_indexes
List all your ColdState indexes with their status, mode, document count, and domain preset.
coldstate_related
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.
coldstate_resolve
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.
coldstate_search
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`.
coldstate_search_global
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.
coldstate_snapshot
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_stats
Deterministic statistics. With a `query`: total matches + state distribution of the top results. Without: global knowledge-base stats (entry count, domains, snapshot).
coldstate_verify
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.

Endpoints

URLTransportStateLatencyChecked
https://cold-api.coldstate.ai/mcp streamable-http answering 449 ms 11 min ago

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ColdState — Deterministic Knowledge Infrastructure — questions

Answers built from our own checks of this server.

What can ColdState — Deterministic Knowledge Infrastructure do?
It exposes 16 tools, read directly from the server on our last check. Among them: coldstate_batch_search, coldstate_browse_documents, coldstate_capabilities, coldstate_cite, coldstate_domains, coldstate_explain and 10 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is ColdState — Deterministic Knowledge Infrastructure working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 435 ms. The bar chart above shows every period we have measured.
How do I connect ColdState — Deterministic Knowledge Infrastructure?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does ColdState — Deterministic Knowledge Infrastructure need an API key?
No. ColdState — Deterministic Knowledge Infrastructure completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 16 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is ColdState — Deterministic Knowledge Infrastructure?
It answers our handshake in 435 ms on average, which is faster than 28% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.