# Periodic Table 2026 (remote · theperiodictable.org)

Interactive periodic table with all 118 elements. Properties, comparisons, and more.

- Trust score: 72/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `theperiodictable.org`: 72/100 (this document), [markdown](https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable.md), [page](https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable)

## Channel facts

- Endpoint: `https://theperiodictable.org/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.6`

## 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 2026-11-05.

- **Endpoint Security**: 74/100
  - 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.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - 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**: 67/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 659 tokens (~164/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - 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 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 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 Periodic Table 2026 MCP server?

Periodic Table 2026 is a hosted endpoint at https://theperiodictable.org/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 changzhiai-periodic-table 'https://theperiodictable.org/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "changzhiai-periodic-table": {
      "url": "https://theperiodictable.org/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "changzhiai-periodic-table": {
      "type": "http",
      "url": "https://theperiodictable.org/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.changzhiai-periodic-table]
url = "https://theperiodictable.org/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "changzhiai-periodic-table": {
      "type": "remote",
      "url": "https://theperiodictable.org/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add changzhiai-periodic-table --url 'https://theperiodictable.org/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  changzhiai-periodic-table:
    url: "https://theperiodictable.org/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "changzhiai-periodic-table": {
      "Transport": "http",
      "Url": "https://theperiodictable.org/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add changzhiai-periodic-table -t streamable-http -u 'https://theperiodictable.org/mcp'
```

### Other

```json
{
  "mcpServers": {
    "changzhiai-periodic-table": {
      "type": "http",
      "url": "https://theperiodictable.org/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.

### 2026-11-05 (score 72, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-11-02 (score 71, +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.

### 2026-11-01 (score 70, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-31 (score 70)

First indexed and scored.

## MCP tools (4)

### `get_element` (~117 tokens)

Get element

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.

Input parameters:

- `element` (string, required): Symbol (Fe), atomic number (26) or name in any supported language (iron, Eisen, 铁)
- `locale` (string): Language for names and text: en, es, fr, de, zh, pt, ja, hi, ru (default en)

### `search_elements` (~120 tokens)

Search elements

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.

Input parameters:

- `limit` (integer): Maximum results (default 10)
- `locale` (string): Language for names and text: en, es, fr, de, zh, pt, ja, hi, ru (default en)
- `query` (string, required): What to look for, e.g. "Fe", "26", "carb", "Sauerstoff", "金"

### `list_elements` (~259 tokens)

List elements

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.

Input parameters:

- `block` (string): Block
- `category` (string): Category
- `group` (integer): Group (column), 1-18; lanthanides and actinides have none
- `limit` (integer): Maximum results (default 118)
- `locale` (string): Language for names and text: en, es, fr, de, zh, pt, ja, hi, ru (default en)
- `max` (number): Maximum value of `property` (inclusive), in its unit
- `min` (number): Minimum value of `property` (inclusive), in its unit
- `period` (integer): Period (row), 1-7
- `phase` (string): State at 25 °C, derived from the melting and boiling points
- `property` (string): Numeric property for min/max and sorting
- `sort` (string): Sort by `property` (default: atomic number)

### `compare_elements` (~83 tokens)

Compare elements

Side-by-side numeric properties of 2-10 elements, with units.

Input parameters:

- `elements` (array, required): The elements to compare
- `locale` (string): Language for names and text: en, es, fr, de, zh, pt, ja, hi, ru (default en)
- `properties` (array): Properties to include (default: all numeric properties)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable#diagnostics

## Score history

- 2026-11-05: 72
- 2026-11-04: 71
- 2026-11-03: 71
- 2026-11-02: 71
- 2026-11-01: 70
- 2026-10-31: 70

## Common questions

### What is the Periodic Table 2026 MCP server?

Periodic Table 2026 is an MCP server listed in the public MCP registry as io.github.changzhiai/periodic-table. Interactive periodic table with all 118 elements. Properties, comparisons, and more. This page covers its hosted endpoint (https://theperiodictable.org/mcp).

### Is the Periodic Table 2026 MCP server safe to use?

Periodic Table 2026 scores 72 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 Periodic Table 2026 MCP server expose?

Periodic Table 2026 exposes 4 tools: get_element, search_elements, list_elements, compare_elements. Their descriptions and schemas cost roughly 579 tokens of context every time the server is loaded.

### Does the Periodic Table 2026 MCP server require authentication?

No. We connected to Periodic Table 2026 without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Periodic Table 2026 MCP server still maintained?

Periodic Table 2026 is still listed as active in the MCP registry. We last reached this channel on 5 November 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://theperiodictable.org/mcp
- Website: https://theperiodictable.org/
- Changelog RSS feed: https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable.xml
- Changelog JSON feed: https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable.json
- HTML version of this page: https://verifymcp.io/servers/changzhiai-periodic-table/theperiodictable