Periodic Table 2026
REMOTE · THEPERIODICTABLE.ORG
Interactive periodic table with all 118 elements. Properties, comparisons, and more.
Available components
Last scanned (4 hours ago)
Scores higher than 58% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Health and Science
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. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability67
- AI-judged instruction clarity (good).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management17
- Stability observed for 5 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +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.
- 2 Nov 26 +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.
- 1 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- 31 Oct 26 70
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://theperiodictable.org/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=theperiodictable.org | CN=YR2,O=Let's Encrypt,C=US | 30 Sept 2026 | 29 Dec 2026 | RSA 2048 | SHA256-RSA | 6e806a52e67603d4a6a448897858a607b3e |
| SANs: theperiodictable.org, www.theperiodictable.org | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of theperiodictable.org. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| org. | present | 725, 26974 | 8, 8 | Verified |
| theperiodictable.org. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://theperiodictable.org/mcp | Verified | 200 | |
| http (plaintext) | http://theperiodictable.org/mcp | HTTPS enforced | 301 | https://theperiodictable.org/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
compare_elements Compare elements ~83
Side-by-side numeric properties of 2-10 elements, with units.
| Name | Type | Req | Description |
|---|---|---|---|
| elements | array | yes | 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) |
No output schema declared.
No examples provided.
get_element Get element ~117
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.
| Name | Type | Req | Description |
|---|---|---|---|
| element | string | yes | 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) |
No output schema declared.
No examples provided.
list_elements List elements ~259
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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) |
No output schema declared.
No examples provided.
search_elements Search elements ~120
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.
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | What to look for, e.g. "Fe", "26", "carb", "Sauerstoff", "金" |
No output schema declared.
No examples provided.
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.
remote · theperiodictable.org
claude mcp add --transport http changzhiai-periodic-table 'https://theperiodictable.org/mcp'
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.