PT Chart
REMOTE · PT-CHART-MCP-PRODUCTION.UP.RAILWAY.APP
PT chart lookups, superheat/subcooling calculators, and diagnostics for HVAC technicians.
Available components
Last scanned (22 hours ago)
Scores higher than 47% of remote servers
Reachable. Last reached 22 Oct 2026.
Category IoT and Hardware
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 Security57
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 8 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- 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 Usability70
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 835 tokens (~104/item across 8 items; 8 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage67
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 0% of tool parameters carry a description.Fail
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a current MCP spec version (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.
- 22 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 20 Oct 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.
- 19 Oct 26 0
- Stability: unverified → 0.03 ▲ functional
- 18 Oct 26 61
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 22 Oct 2026 · Probed https://pt-chart-mcp-production.up.railway.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.up.railway.app | CN=YE2,O=Let's Encrypt,C=US | 27 Sept 2026 | 26 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 618edc56941aa1165ddb080bf9f799eb7c1 |
| SANs: *.up.railway.app, up.railway.app | ||||||
| CN=YE2,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 4df3b15dd6c0784c507cd37b58e6f115 |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of pt-chart-mcp-production.up.railway.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| app. | present | 23684 | 8 | Verified |
| railway.app. | 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://pt-chart-mcp-production.up.railway.app/mcp | Verified | 200 | |
| http (plaintext) | http://pt-chart-mcp-production.up.railway.app/mcp | HTTPS enforced | 301 | https://pt-chart-mcp-production.up.railway.app/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 →
convert_units ~85
Convert between pressure units (psig, psia, kpa, bar) and temperature units (F, C). A bare 'psi' is treated as psig. For certified HVAC technicians (EPA 608; A2L certification where required).
| Name | Type | Req | Description |
|---|---|---|---|
| from_unit | string | yes | – |
| to_unit | string | yes | – |
| value | number | yes | – |
No output schema declared.
No examples provided.
coolbooked_info ~61
About CoolBooked: the AI appointment-booking connector for HVAC shops. This is NOT a diagnostic tool -- call it when someone asks what CoolBooked is, how shop owners can try it, or how the free PT tools connect to paid bookings.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
diagnose ~164
Conversational diagnostic copilot: give it field readings and get back computed superheat/subcooling plus a ranked 'check this first' list. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only -- it suggests what to CHECK, never how to defeat a safety device, vent refrigerant, or work uncertified. metering: 'txv' (default) or 'fixed' for fixed-orifice/piston systems.
| Name | Type | Req | Description |
|---|---|---|---|
| ambient_f | number | yes | – |
| head_psig | number | yes | – |
| liquid_line_f | number | yes | – |
| metering | string | – | – |
| refrigerant | string | yes | – |
| suction_line_f | number | yes | – |
| suction_psig | number | yes | – |
No output schema declared.
No examples provided.
pt_lookup ~129
Saturation pressure (bubble and dew, in psig) for a refrigerant at a temperature in Fahrenheit. For certified HVAC technicians (EPA 608; A2L certification where required). Example: pt_lookup("R-454B", 45). Bubble point: use for subcooling calculations. Dew point: use for superheat calculations. Pure fluids (R-32, R-410A, R-22, R-134a) have no glide, so both values match.
| Name | Type | Req | Description |
|---|---|---|---|
| refrigerant | string | yes | – |
| temp_f | number | yes | – |
No output schema declared.
No examples provided.
pt_reverse ~120
Saturation temperature (bubble and dew, in Fahrenheit) for a refrigerant at a pressure in psig. For certified HVAC technicians (EPA 608; A2L certification where required). Example: a 130 psig suction reading on R-454B -- pt_reverse("R-454B", 130). Use the DEW temperature for superheat work and the BUBBLE temperature for subcooling work on blended refrigerants.
| Name | Type | Req | Description |
|---|---|---|---|
| pressure_psig | number | yes | – |
| refrigerant | string | yes | – |
No output schema declared.
No examples provided.
refrigerant_info ~67
Reference card for a refrigerant: GWP, ASHRAE safety class, composition, typical oil, temperature glide, and handling notes. For certified HVAC technicians (EPA 608; A2L certification where required). Informational only.
| Name | Type | Req | Description |
|---|---|---|---|
| refrigerant | string | yes | – |
No output schema declared.
No examples provided.
subcooling ~106
Subcooling in Fahrenheit from head pressure (psig) and liquid-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the BUBBLE point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.
| Name | Type | Req | Description |
|---|---|---|---|
| head_psig | number | yes | – |
| liquid_line_f | number | yes | – |
| refrigerant | string | yes | – |
No output schema declared.
No examples provided.
superheat ~103
Superheat in Fahrenheit from suction pressure (psig) and suction-line temperature (F). For certified HVAC technicians (EPA 608; A2L certification where required). Uses the DEW point as the saturation basis, which is the correct basis for blended refrigerants. Typical TXV target: 8-12F.
| Name | Type | Req | Description |
|---|---|---|---|
| refrigerant | string | yes | – |
| suction_line_f | number | yes | – |
| suction_psig | number | yes | – |
No output schema declared.
No examples provided.
How do I install the PT Chart MCP server?
PT Chart is a hosted endpoint at https://pt-chart-mcp-production.up.railway.app/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 · pt-chart-mcp-production.up.railway.app
claude mcp add --transport http tsonnn-pt-chart-mcp 'https://pt-chart-mcp-production.up.railway.app/mcp'
What is the PT Chart MCP server?
PT Chart is an MCP server listed in the public MCP registry as io.github.Tsonnn/pt-chart-mcp. PT chart lookups, superheat/subcooling calculators, and diagnostics for HVAC technicians. This page covers its hosted endpoint (https://pt-chart-mcp-production.up.railway.app/mcp).
Is the PT Chart MCP server safe to use?
PT Chart scores 63 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 PT Chart MCP server expose?
PT Chart exposes 8 tools: pt_lookup, pt_reverse, superheat, subcooling, convert_units, and 3 more. Their descriptions and schemas cost roughly 835 tokens of context every time the server is loaded.
Does the PT Chart MCP server require authentication?
No. We connected to PT Chart without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the PT Chart MCP server still maintained?
PT Chart is still listed as active in the MCP registry. We last reached this channel on 22 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.