Periodic Table 2026
io.github.changzhiai/periodic-tablechangzhiaistreamable-httpv1.0.5Scanned
Interactive periodic table with all 118 elements. Properties, comparisons, and more.
4 tools: 4 only read.
- Reads private data · 1
- Reads text others write · 0
- Can send data out · 0
- No findings
Anlyon alternative
Run the operations that matter 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.
4 tools
Only reads 4Show 4 read-only tools
compare_elementsSide-by-side numeric properties of 2-10 elements, with units.No findings
Why it is in this group
- The name "compare_elements" says "compare": a word for reading.
Description, as the server wrote it Side-by-side numeric properties of 2-10 elements, with units.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
get_elementEverything the Interactive Periodic Table knows about one element: classification, physical and chemical properties with units, electron configuration, discovery, a short summary a…Reads private dataNo findings
Why it is in this group
- The name "get_element" says "get": a word for reading.
What it can reach
- private-dataThe description's first sentence says "table": it reads databases.
Description, as the server wrote it Everything the Interactive Periodic Table knows about one element: classification, physical and chemical properties with units, electron configuration, discovery, a short summary and a longer introduction (uses, production, history, safety), plus the link to its page.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
list_elementsList elements, optionally filtered by category, block, period, group, state at 25 °C or a numeric property range, and sorted by a property.No findings
Why it is in this group
- The name "list_elements" says "list": a word for reading.
Description, as the server wrote it List elements, optionally filtered by category, block, period, group, state at 25 °C or a numeric property range, and sorted by a property. Without filters it lists all 118 elements in atomic-number order. Elements with no value for the range or sort property are left out.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
search_elementsFind elements by symbol, atomic number, or full or partial name in any supported language.No findings
Why it is in this group
- The name "search_elements" says "search": a word for reading.
Description, as the server wrote it Find elements by symbol, atomic number, or full or partial name in any supported language. Use it when a name is misspelled, partial or in another language.
Annotations the server declares
- readOnlyHint: true
- openWorldHint: false
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 untrusted-input or outbound.
- Reads private data1
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write0
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
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.
No check matched anything in these tool definitions. That is not a safety guarantee.
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.
Install
Pinned to version 1.0.5. Values in angle brackets are yours to fill in.
claude mcp add --transport http periodic-table https://theperiodictable.org/mcpclaude mcp add --transport http periodic-table https://theperiodictable.org/mcpRun 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.
{
"permissions": {
"allow": [
"mcp__periodic-table__get_element",
"mcp__periodic-table__search_elements",
"mcp__periodic-table__list_elements",
"mcp__periodic-table__compare_elements"
],
"ask": [],
"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 periodic-table. Review it before you use it.
Capability tags behind 1 rule
- mcp__periodic-table__get_element private-data
Pin
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.changzhiai/periodic-table/verify?hash=a5edcd1e4219799925cdda68a7565dd2c9bbd9e928734667297219f7f029821e" | jq -e '.changed == false'Pinned hash a5edcd1e4219, from Oct 30, 2026, 23:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.github.changzhiai/periodic-table/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/io.github.changzhiai/periodic-table)Source: MCP Registry. Synced Oct 30, 2026, 23:18 UTC.