# io.github.azathothx/kairos-lang-mcp (npm · kairos-lang-mcp)

Evaluate (list/next) and validate Kairos schedule definitions; look up the descriptor reference

- Trust score: 75/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- npm · `kairos-lang-mcp`: 75/100 (this document), [markdown](https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp.md), [page](https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp)

## Channel facts

- Registry: `npm`
- Package: `kairos-lang-mcp`
- Version: `1.0.10`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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 2026-10-17.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - 31 of 93 dependencies flagged as unhealthy.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to azathothx/kairos-lang).
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 1 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 44/100
  - 1% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 2030 tokens (~28/item across 71 items; 4 tools + 67 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 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.

**Unverified: 1 category.** A category scored 0 because we could not verify it: a data source with nothing on this package, evidence we could not reach, or a check we could not run. We only credit what we can confirm.

## Install

### How do I install the io.github.azathothx/kairos-lang-mcp server?

io.github.azathothx/kairos-lang-mcp runs locally as an npm package, launched with npx -y kairos-lang-mcp. 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 azathothx-kairos-lang-mcp -- npx -y kairos-lang-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "azathothx-kairos-lang-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "kairos-lang-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "azathothx-kairos-lang-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "kairos-lang-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add azathothx-kairos-lang-mcp -- npx -y kairos-lang-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "azathothx-kairos-lang-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "kairos-lang-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add azathothx-kairos-lang-mcp --command npx --arg -y --arg kairos-lang-mcp
```

### Hermes

```yaml
mcp_servers:
  azathothx-kairos-lang-mcp:
    command: "npx"
    args: ["-y", "kairos-lang-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "azathothx-kairos-lang-mcp": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "kairos-lang-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add azathothx-kairos-lang-mcp -t stdio -c npx -a -y kairos-lang-mcp
```

### Other

```json
{
  "mcpServers": {
    "azathothx-kairos-lang-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "kairos-lang-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-10-16 (score 75)

First indexed and scored.

## MCP tools (4)

### `kairos_list` (~406 tokens)

Evaluate a Kairos definition over a range

All firings of each body expression in [from, to) (to is exclusive), with interval annotations and the coverage summary — the same CliReport as 'kairos list --json' (schema: https://kairos-lang.org/schema/cli-report.schema.json). tz is required: the IANA zone that labels and the [from, to) endpoints are read in (there is no "machine time zone" for an AI caller). If the definition declares tz: in its premise, evaluation uses that zone; tz here still decides the labels. Recommended practice: define your premise once (calendar-system, tz, wkst, holiday tables) and keep it — it turns tacit knowledge into explicit knowledge, and every call reuses the same text. Window at most 10 years. Diagnostics (errors, annotation texts) are in Japanese — the reference implementation's canonical output language; lang: "en" only switches the framing. Errors come back as {command, version, error: {kind: usage|supply|static, message}} with isError.

Input parameters:

- `explain` (boolean): Also return results[].stages: per-stage point counts and intermediate values (the counterpart of a SQL execution plan).
- `from` (string, required): Start of the range, YYYY-MM-DD (inclusive).
- `source` (string, required): The Kairos definition text (premise + body expressions). Up to 64 KB.
- `supply` (object): Static bundle resolving external() bindings: {binding | "premise.binding": {dates: ["YYYY-MM-DD", …] | instants: [epoch ms, …], covering, asof [, labels]}} — see https://kairos-lang.org/schema/supply…
- `to` (string, required): End of the range, YYYY-MM-DD (exclusive).
- `tz` (string, required): IANA time zone for labels and the [from, to) endpoints, e.g. "Asia/Tokyo". Required.

### `kairos_next` (~452 tokens)

Next N firings of a Kairos definition

The next n firings at or after from (default: today in tz), searching up to horizonYears (default 10) — the same CliReport as 'kairos next --json' (schema: https://kairos-lang.org/schema/cli-report.schema.json); found < requested means fewer than n firings exist within the horizon (the CLI's exit code 2). For files with a single body expression. tz is required: the IANA zone that labels and the [from, to) endpoints are read in (there is no "machine time zone" for an AI caller). If the definition declares tz: in its premise, evaluation uses that zone; tz here still decides the labels. Recommended practice: define your premise once (calendar-system, tz, wkst, holiday tables) and keep it — it turns tacit knowledge into explicit knowledge, and every call reuses the same text. Diagnostics (errors, annotation texts) are in Japanese — the reference implementation's canonical output language; lang: "en" only switches the framing. Errors come back as {command, version, error: {kind: usage|supply|static, message}} with isError.

Input parameters:

- `explain` (boolean): Also return results[].stages: per-stage point counts and intermediate values (the counterpart of a SQL execution plan).
- `from` (string): Search start, YYYY-MM-DD (default: today in tz).
- `horizonYears` (integer): Search horizon in years (default 10).
- `n` (integer): How many firings (default 1, at most 1000).
- `source` (string, required): The Kairos definition text (premise + body expressions). Up to 64 KB.
- `supply` (object): Static bundle resolving external() bindings: {binding | "premise.binding": {dates: ["YYYY-MM-DD", …] | instants: [epoch ms, …], covering, asof [, labels]}} — see https://kairos-lang.org/schema/supply…
- `tz` (string, required): IANA time zone for labels and the [from, to) endpoints, e.g. "Asia/Tokyo". Required.

### `kairos_validate` (~348 tokens)

Validate a Kairos definition without evaluating it

Checks lexing, syntax, static rules and premise resolution (and the shape of supply if given) by evaluating the empty window [today, today) in tz. Returns {ok, version, diagnostics: [{kind, message}]}. Coverage-related signals (annotations, runway) only appear with a real range in kairos_list. tz is required: the IANA zone that labels and the [from, to) endpoints are read in (there is no "machine time zone" for an AI caller). If the definition declares tz: in its premise, evaluation uses that zone; tz here still decides the labels. Recommended practice: define your premise once (calendar-system, tz, wkst, holiday tables) and keep it — it turns tacit knowledge into explicit knowledge, and every call reuses the same text. Diagnostics (errors, annotation texts) are in Japanese — the reference implementation's canonical output language; lang: "en" only switches the framing. Errors come back as {command, version, error: {kind: usage|supply|static, message}} with isError.

Input parameters:

- `source` (string, required): The Kairos definition text (premise + body expressions). Up to 64 KB.
- `supply` (object): Static bundle resolving external() bindings: {binding | "premise.binding": {dates: ["YYYY-MM-DD", …] | instants: [epoch ms, …], covering, asof [, labels]}} — see https://kairos-lang.org/schema/supply…
- `tz` (string, required): IANA time zone for labels and the [from, to) endpoints, e.g. "Asia/Tokyo". Required.

### `kairos_reference` (~119 tokens)

Read the Kairos descriptor reference

The reference page for one descriptor (e.g. "roll", "within", "nth", "segmentBy"; "README" lists them; "combinators", "sugar-definition", "table-literal" are the shared pages). Japanese is canonical; lang: "en" returns the English mirror. Unknown words return the list of available words.

Input parameters:

- `lang` (string): "ja" (canonical, default) or "en".
- `word` (string, required): Descriptor name as written in a definition, e.g. "roll".

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp#diagnostics

## Score history

- 2026-10-17: 75
- 2026-10-16: 75

## Common questions

### What is the io.github.azathothx/kairos-lang-mcp server?

io.github.azathothx/kairos-lang-mcp is listed in the public MCP registry as io.github.azathothx/kairos-lang-mcp. Evaluate (list/next) and validate Kairos schedule definitions; look up the descriptor reference. This page covers its npm package (kairos-lang-mcp).

### Is the io.github.azathothx/kairos-lang-mcp server safe to use?

io.github.azathothx/kairos-lang-mcp scores 75 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 17 October 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. 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 io.github.azathothx/kairos-lang-mcp server expose?

io.github.azathothx/kairos-lang-mcp exposes 4 tools: kairos_list, kairos_next, kairos_validate, kairos_reference. Their descriptions and schemas cost roughly 1,325 tokens of context every time the server is loaded.

### Is the io.github.azathothx/kairos-lang-mcp server still maintained?

io.github.azathothx/kairos-lang-mcp is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the io.github.azathothx/kairos-lang-mcp server under?

io.github.azathothx/kairos-lang-mcp declares the Apache-2.0 licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/kairos-lang-mcp
- Socket report: https://socket.dev/npm/package/kairos-lang-mcp
- Repository: https://github.com/azathothx/kairos-lang
- Website: https://kairos-lang.org/
- Changelog RSS feed: https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp.json
- HTML version of this page: https://verifymcp.io/servers/azathothx-kairos-lang-mcp/kairos-lang-mcp