Chart Color System
REMOTE · CHART-COLOR-MCP.VERCEL.APP
Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only.
Available components
Last scanned (7 hours ago)
Scores higher than 93% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Design and Media
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 Security80
- 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. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- 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 (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 733 tokens (~183/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 Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage94
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 81% of tool parameters carry a description.Partial
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
Checks we ran (13)
- TLS certificate
- Authorization
- HTTPS
- HSTS header
- DNSSEC
- Transport
- Schema quality
- Stability
- Tool coverage
- Injection markers
- Destructive annotations
- Judged manipulation
- MCP protocol
Does not apply to this hosted endpoint (2)
- Supply Chain SecurityScored on package channels only. This is a hosted endpoint, so there is nothing to install or inspect.
- Provenance & TransparencyScored on package channels only. This is a hosted endpoint, so there is nothing to install or inspect.
The score does not measure everything. What the score does not measure →
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 0
- Stability: 0.97 → pass security
- 4 Nov 26 0
- Stability: pass → 0.97 functional
- 16 Oct 26 0
- Stability: 0.97 → pass security
- 15 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
- 13 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.
- 12 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 80 to 87. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 26 at this one. The score rises as the window fills, whether or not the server changes.
- 10 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 70 to 80. That category is still filling its 30-day observation window: 21 days of observed history at the previous scan, 24 at this one. The score rises as the window fills, whether or not the server changes.
- 7 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 60 to 70. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.
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://chart-color-mcp.vercel.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.vercel.app | CN=WR1,O=Google Trust Services,C=US | 31 Oct 2026 | 29 Jan 2027 | RSA 2048 | SHA256-RSA | 9c5f0e6a35c955e113044c86848e4cd5 |
| SANs: *.vercel.app | ||||||
| CN=WR1,O=Google Trust Services,C=US (CA) | CN=GTS Root R1,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | RSA 2048 | SHA256-RSA | 7fd9e2c2d2048a0474b627a26d0868a7 |
| CN=GTS Root R1,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 19 Jun 2020 | 28 Jan 2028 | RSA 4096 | SHA256-RSA | 77bd0d6cdb36f91aea210fc4f058d30d |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of chart-color-mcp.vercel.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | Trust anchor | 20326, 38696 | 8, 8 | Verified |
| app. | DS published | 23684 | 8 | Verified |
| vercel.app. | No DS | 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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000; includeSubDomains; preload |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://chart-color-mcp.vercel.app/mcp | Verified | 200 | |
| http (plaintext) | http://chart-color-mcp.vercel.app/mcp | HTTPS enforced | 308 | https://chart-color-mcp.vercel.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 →
audit_palette Audit a chart palette ~144
Audit existing chart colors for accessibility: pairwise OKLab separation under normal vision, deuteranopia, protanopia, tritanopia and achromatopsia, plus WCAG 2.2 non-text contrast (3:1) of every color against the chart background. Returns a pass / warn / fail verdict with the numbers behind it. Set ramp=true for sequential or diverging scales, whose steps are meant to be close.
| Name | Type | Req | Description |
|---|---|---|---|
| background | string | – | Chart background color |
| colors | array | yes | Palette colors in slot order (CSS syntax) |
| ramp | boolean | – | true for a sequential or diverging scale (skips pairwise separation) |
No output schema declared.
No examples provided.
build_ramp Build a sequential or diverging ramp ~132
Build an evenly spaced perceptual (OKLab) color scale: sequential from start to end, or diverging from start through mid to end. Returns the steps and a background-contrast audit (pairwise separation is not judged for ramps).
| Name | Type | Req | Description |
|---|---|---|---|
| background | string | – | – |
| end | string | yes | Last color (or the positive end) |
| kind | string | yes | – |
| mid | string | – | Middle color for a diverging scale; default a neutral near the background |
| start | string | yes | First color (or the negative end of a diverging scale) |
| steps | integer | – | – |
No output schema declared.
No examples provided.
simulate_palette Simulate colorblind vision ~88
Show what each color looks like to readers with deuteranopia, protanopia, tritanopia or achromatopsia (published Machado 2009 matrices), so an assistant can describe or render the palette as a colorblind reader sees it.
| Name | Type | Req | Description |
|---|---|---|---|
| colors | array | yes | Colors in slot order (CSS syntax) |
| modes | array | – | Vision modes to simulate; default all |
No output schema declared.
No examples provided.
solve_palette Solve a chart palette ~180
Generate a categorical chart palette of n colors (1-12) that maximizes perceptual separation under normal vision and colorblindness, with the given brand colors locked as anchors in slot order. Returns the palette, the worst pair distances, the engine's relaxation notes, a full accessibility audit against the background, and a link to open it in the app. Honest cap is 6 slots; above that the result says so.
| Name | Type | Req | Description |
|---|---|---|---|
| anchors | array | – | Brand or required colors, kept exactly, in slot order (CSS syntax) |
| background | string | – | Chart background color |
| grid | string | – | Gridline color; defaults to a light or dark gray to match the background |
| n | integer | – | Number of categorical slots |
| posture | string | – | kpi: few strong colors; comparative: balanced; exploratory: many muted |
No output schema declared.
No examples provided.
How do I install the Chart Color System MCP server?
Chart Color System is a hosted endpoint at https://chart-color-mcp.vercel.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 · chart-color-mcp.vercel.app
claude mcp add --transport http socraticstatic-chart-color-system 'https://chart-color-mcp.vercel.app/mcp'
What is the Chart Color System MCP server?
Chart Color System is an MCP server listed in the public MCP registry as io.github.socraticstatic/chart-color-system. Solve, audit and simulate colorblind-safe chart palettes. WCAG contrast, OKLab ΔE. Read-only. This page covers its hosted endpoint (https://chart-color-mcp.vercel.app/mcp).
Is the Chart Color System MCP server safe to use?
Chart Color System scores 86 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 Chart Color System MCP server expose?
Chart Color System exposes 4 tools: solve_palette, audit_palette, simulate_palette, build_ramp. Their descriptions and schemas cost roughly 544 tokens of context every time the server is loaded.
Does the Chart Color System MCP server require authentication?
No. We connected to Chart Color System without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Chart Color System MCP server still maintained?
Chart Color System 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.
What did VerifyMCP test on the Chart Color System MCP server?
VerifyMCP ran 13 checks on Chart Color System, covering TLS certificate, Authorization, HTTPS, HSTS header and 9 more. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.