ChronoGate

io.github.chronogate/chronogatechronogatestreamable-httpv0.1.0Scanned 1 hour ago

Timezone and business-day truth for agents: now, DST-safe convert, relative dates, holidays.

5 tools: 1 do something that can't be undone, 3 change things and 1 only read.

Reads private data · 0
Reads text others write · 3
Can send data out · 1
2 findings

Anlyon alternative

4 of these tools change something. Run those as governed actions.

Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.

Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.

Import an OpenAPI spec →

Tools

Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.

5 tools

Can't be undone 1Sends, pays, publishes or merges: once done, it cannot be taken back.Claude Code: ask

convertConvert an ISO-8601 instant (or naive local with from=) between IANA zones, handling DST.Can send data out1 finding
Why it is in this group
- The name "convert" says "convert": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Findings
- Warn
  The server marks "convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
  Matched text
  annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "convert" says "convert": a word for a change.
  What this check looks for
Description, as the server wrote it
Convert an ISO-8601 instant (or naive local with from=) between IANA zones, handling DST.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false

Changes things 3Creates or changes something that can be changed back.Claude Code: ask

add_business_daysAdd N business days to a start date, skipping weekends and public holidays.Reads text others write1 finding
Why it is in this group
- The name "add_business_days" says "add": a word for a change.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Findings
- Warn
  The server marks "add_business_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
  Matched text
  annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "add_business_days" says "add": a word for a change.
  What this check looks for
Description, as the server wrote it
Add N business days to a start date, skipping weekends and public holidays.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
is_business_dayWhether a YYYY-MM-DD date is a business day in a country (weekend + Nager.Date public holidays).Reads text others writeNo findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Whether a YYYY-MM-DD date is a business day in a country (weekend + Nager.Date public holidays).
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true
nowCurrent instant plus wall-clock time in an IANA timezone (e.g.No findings
Why it is in this group
- Nothing in its name or description says what it does, so it is counted as a write.
- The server marks it read-only (readOnlyHint: true), but an annotation never lowers a class.
Description, as the server wrote it
Current instant plus wall-clock time in an IANA timezone (e.g. America/Chicago). Includes offset and DST flag.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false

Only reads 1Looks things up and changes nothing.Show 1 read-only tool

resolve_expressionResolve expressions like "next Tuesday 3pm", "tomorrow 9am", or "in 2 business days" in a timezone.Reads text others writeNo findings
Why it is in this group
- The name "resolve_expression" says "resolve": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it
Resolve expressions like "next Tuesday 3pm", "tomorrow 9am", or "in 2 business days" in a timezone.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: true

This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.

Exfil surface

Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.

No private-data, untrusted-input, outbound path in this server alone: no tool is tagged private-data.

Reads private data0: Reads files, mail, messages, databases, secrets, calendars or repositories.
Reads text others write3: Brings in text someone else can write: web pages, inbound email, messages, issues and comments.; add_business_days
is_business_day
resolve_expression
Can send data out1: Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.; convert

Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.

Findings

Matches of fixed checks, with the text they matched.

2 warn

Warnconvert
The server marks "convert" read-only (readOnlyHint: true), and its own name, description or input give the class "irreversible".
Matched text
annotations: {"readOnlyHint":true,"openWorldHint":false}; The name "convert" says "convert": a word for a change.
What this check looks for
Warnadd_business_days
The server marks "add_business_days" read-only (readOnlyHint: true), and its own name, description or input give the class "write".
Matched text
annotations: {"readOnlyHint":true,"openWorldHint":true}; The name "add_business_days" says "add": a word for a change.
What this check looks for

History

Changes to its tool definitions and to its remote endpoint, newest first.

No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.

All changes to this server

Install

Pinned to version 0.1.0. Values in angle brackets are yours to fill in.

claude mcp add --transport http chronogate https://chronogate-self.vercel.app/mcp

claude mcp add --transport http chronogate https://chronogate-self.vercel.app/mcp

Run in a terminal.

Claude Code permissions

Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.

.claude/settings.json

{
  "permissions": {
    "allow": [
      "mcp__chronogate__resolve_expression"
    ],
    "ask": [
      "mcp__chronogate__now",
      "mcp__chronogate__convert",
      "mcp__chronogate__is_business_day",
      "mcp__chronogate__add_business_days"
    ],
    "deny": []
  }
}

Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as chronogate. Review it before you use it.

Capability tags behind 4 rules

mcp__chronogate__convert outbound
mcp__chronogate__resolve_expression untrusted-input
mcp__chronogate__is_business_day untrusted-input
mcp__chronogate__add_business_days untrusted-input

Keep the decision: fail CI when the tools change, follow every change, or show a badge.

Pin in CI

Fail a build when the tools you reviewed are not the tools the server serves today.

curl -s "https://anlyon.dev/api/v1/servers/io.github.chronogate/chronogate/verify?hash=7c0587b2de502f7f63d23f081f67ba56d6ee98161ee0078d69ce65619f29324e" | jq -e '.changed == false'

Pinned hash 7c0587b2de50, from Nov 1, 2026, 22:18 UTC.

Watch

Get told when its tools change: a new tool, a new description, a new class.

https://anlyon.dev/servers/io.github.chronogate/chronogate/changes.xml

An Atom feed. Works in any feed reader or Slack's RSS app.

Badge

[![anlyon.dev](https://anlyon.dev/badge/io.github.chronogate/chronogate.svg)](https://anlyon.dev/servers/io.github.chronogate/chronogate)

Source: MCP Registry · repository. Synced Nov 1, 2026, 22:18 UTC.