Charts by Szum
REMOTE · SZUM.IO · SCANNED SEP 21
Create, inspect, manage, and render charts and data visualizations as SVG/PNG or interactive embeds.
Available components
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 Security63
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (update_chart). See how to fix → View diagnostics → Fail
- 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 Usability84
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (excellent).Pass
- Context-footprint check failed: tool/resource definitions use about 2113 tokens (~132/item across 16 items; 13 tools + 3 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 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
- Structured output schemas are declared (100% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 15 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
- Supports UI / widget rendering.Pass
How do I install the Charts by Szum MCP server?
Charts by Szum is a hosted endpoint at https://szum.io/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 · szum.io
claude mcp add --transport http io-szum-charts 'https://szum.io/mcp'
{
"mcpServers": {
"io-szum-charts": {
"url": "https://szum.io/mcp"
}
}
} {
"servers": {
"io-szum-charts": {
"type": "http",
"url": "https://szum.io/mcp"
}
}
} [mcp_servers.io-szum-charts] url = "https://szum.io/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"io-szum-charts": {
"type": "remote",
"url": "https://szum.io/mcp",
"enabled": true
}
}
} openclaw mcp add io-szum-charts --url 'https://szum.io/mcp' --transport streamable-http
mcp_servers:
io-szum-charts:
url: "https://szum.io/mcp" {
"McpServers": {
"io-szum-charts": {
"Transport": "http",
"Url": "https://szum.io/mcp"
}
}
} assistant mcp add io-szum-charts -t streamable-http -u 'https://szum.io/mcp'
{
"mcpServers": {
"io-szum-charts": {
"type": "http",
"url": "https://szum.io/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
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.
- 26 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 25 Aug 26 0
- Stability: 0.97 → pass security
- 24 Aug 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.
- 11 Aug 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 6 Aug 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: good → fair functional
- 5 Aug 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “render_chart” rewrote its description, which is the text the model reads security
- Tool “save_chart” rewrote its description, which is the text the model reads security
- Tool “update_chart” rewrote its description, which is the text the model reads security
- Tool “validate_chart” rewrote its description, which is the text the model reads security
- Server version: 1.3.0 → 1.4.0 functional
- “render_chart” reworded the description of “config” cosmetic
- “save_chart” reworded the description of “config” cosmetic
- “update_chart” reworded the description of “config” cosmetic
- “validate_chart” reworded the description of “config” cosmetic
- 4 Aug 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “render_chart” rewrote its description, which is the text the model reads security
- Tool “save_chart” rewrote its description, which is the text the model reads security
- Tool “update_chart” rewrote its description, which is the text the model reads security
- Tool “validate_chart” rewrote its description, which is the text the model reads security
- Schema quality: pass → fail ▼ functional
- Server version: 1.2.0 → 1.3.0 functional
- “render_chart” added an optional parameter “acknowledgeWarnings” cosmetic
- “save_chart” added an optional parameter “acknowledgeWarnings” cosmetic
- “save_chart” added an optional parameter “idempotencyKey” cosmetic
- “update_chart” added an optional parameter “acknowledgeWarnings” cosmetic
- 3 Aug 26 0
- The server rewrote its instructions, which are the text every model session reads security
- Tool “validate_chart” rewrote its description, which is the text the model reads security
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 21 Sept 2026 · Probed https://szum.io/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=szum.io | CN=WE1,O=Google Trust Services,C=US | 29 Jul 2026 | 27 Oct 2026 | ECDSA 256 | ECDSA-SHA256 | 4792d293ad781f8e1385800ad091cb21 |
| SANs: szum.io, *.szum.io | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of szum.io. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| io. | present | 57355 | 8 | Verified |
| szum.io. | 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 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
| referrer-policy | strict-origin-when-cross-origin |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://szum.io/mcp | Verified | 200 | |
| http (plaintext) | http://szum.io/mcp | HTTPS enforced | 301 | https://szum.io/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 →
delete_chart Delete chart ~55
Use this when the user explicitly wants to permanently delete one saved chart. Deletion cannot be undone, and retrying an already completed deletion succeeds; requires authentication.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Opaque 32-character saved-chart id |
| Name | Type | Req | Description |
|---|---|---|---|
| deleted | boolean | yes | – |
No examples provided.
get_chart Get chart ~62
Use this when the user identifies a saved chart by id and wants to view it or retrieve its metadata and URLs. Displays the published chart when available and does not return its config; requires authentication.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Opaque 32-character saved-chart id |
| Name | Type | Req | Description |
|---|---|---|---|
| configUrl | string | yes | Owner-only chart-config endpoint |
| createdAt | string | yes | ISO-8601 creation timestamp |
| editUrl | string | yes | – |
| embedUrl | string | yes | Interactive-embed URL |
| id | string | yes | Opaque 32-character saved-chart id |
| imageUrl | string | yes | Rendered-image URL |
| manageUrl | string | yes | – |
| publishedAt | – | yes | ISO-8601 publish timestamp, or null when public URLs are dark |
| sizeBytes | integer | yes | Compressed size of the stored published config, excluding drafts; 0 means no published config has been stored yet |
| source | string | yes | Chart origin; an open set of string values |
| title | string | yes | Saved chart title |
| updatedAt | string | yes | ISO-8601 last-update timestamp |
| view | string | yes | – |
No examples provided.
get_chart_config Get chart config ~59
Use this when the user identifies a saved chart by id and needs its complete published Szum config for inspection or reuse. Does not return a newer editor draft; requires authentication.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Opaque 32-character saved-chart id |
| Name | Type | Req | Description |
|---|---|---|---|
| attribution | boolean | – | Show a small "Made with Szum" credit in the bottom-right. Always on for free and keyless renders; Creator and Pro omit it by default and set true to opt in. |
| color | – | – | – |
| data | array | – | – |
| footer | string | – | Caption below the chart (a source line, methodology note, date). URLs, bare domains, and [label](url) links in it are auto-detected and rendered as inline links on every surface. |
| format | string | yes | – |
| headerAlign | string | – | – |
| height | integer | – | – |
| locale | string | – | Locale identifier accepted by JavaScript Intl and associated with the chart content, such as en, pl, or zh-Hant. |
| margin | object | – | – |
| marks | array | yes | – |
| plotHeight | integer | – | – |
| plotWidth | integer | – | – |
| scale | integer | – | – |
| subtitle | string | – | – |
| theme | string | – | – |
| themeOverrides | object | – | – |
| title | string | – | – |
| version | string | yes | – |
| width | integer | – | – |
| x | object | – | – |
| y | object | – | – |
No examples provided.
get_examples Get example charts ~49
Use this when the model needs current, ready-to-use Szum chart configs or preferred semantic patterns. Optionally filters examples by mark type.
| Name | Type | Req | Description |
|---|---|---|---|
| mark_type | string | – | Filter examples by mark type |
| Name | Type | Req | Description |
|---|---|---|---|
| examples | array | yes | – |
No examples provided.
get_preview_state Get chart preview state ~64
Use this when the Szum chart App needs to restore a rendered preview as its current transient or saved view. It is read-only, owner-scoped when authenticated, and hidden from the model.
| Name | Type | Req | Description |
|---|---|---|---|
| previewId | string | yes | Opaque 16-character chart-preview id |
| Name | Type | Req | Description |
|---|---|---|---|
| chart | object | – | – |
| status | string | yes | – |
No examples provided.
list_charts List charts ~165
Use this when the user wants to find charts in their saved library. Returns paginated metadata and URLs, not chart configs; requires authentication. Draft-only editor charts have publishedAt null, hasDraft true, and sizeBytes 0 because sizeBytes measures only the stored published config, not draft storage.
| Name | Type | Req | Description |
|---|---|---|---|
| cursor | string | – | Opaque nextCursor from the previous page |
| limit | integer | – | Page size; defaults to 100 and has a maximum of 1000 |
| q | string | – | Case-insensitive title substring search; trimmed and limited to 100 characters |
| sort | string | – | Sort by creation time (default), update time, or title A-Z |
| source | – | – | Filter by one or more chart sources; omit to list all |
| Name | Type | Req | Description |
|---|---|---|---|
| items | array | yes | – |
| nextCursor | – | yes | Opaque cursor for the next page, or null on the last page |
| total | integer | – | Exact match count, present only for title searches |
No examples provided.
list_marks List mark types ~28
Use this when choosing or configuring chart mark types. Returns every available mark with its properties and defaults.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| marks | array | yes | – |
| shared | object | yes | – |
No examples provided.
list_themes List themes ~32
Use this when choosing a visual theme for a chart. Returns every available theme and guidance on where each works best.
Input schema present but exposes no named parameters.
| Name | Type | Req | Description |
|---|---|---|---|
| themes | array | yes | – |
No examples provided.
rename_chart Rename chart ~71
Use this when the user wants to change a saved chart's library title without changing its config, publication state, or public URLs; requires authentication.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | Opaque 32-character saved-chart id |
| title | string | yes | New saved-chart title; trimmed and limited to 200 characters |
| Name | Type | Req | Description |
|---|---|---|---|
| configUrl | string | yes | Owner-only chart-config endpoint |
| createdAt | string | yes | ISO-8601 creation timestamp |
| editUrl | string | yes | – |
| embedUrl | string | yes | Interactive-embed URL |
| id | string | yes | Opaque 32-character saved-chart id |
| imageUrl | string | yes | Rendered-image URL |
| manageUrl | string | yes | – |
| publishedAt | – | yes | ISO-8601 publish timestamp, or null when public URLs are dark |
| sizeBytes | integer | yes | Compressed size of the stored published config, excluding drafts; 0 means no published config has been stored yet |
| source | string | yes | Chart origin; an open set of string values |
| title | string | yes | Saved chart title |
| updatedAt | string | yes | ISO-8601 last-update timestamp |
| view | string | yes | – |
No examples provided.
render_chart Render chart ~269
Use this when the user wants to preview or generate a chart. Validate each generated or changed config once before rendering, saving, or updating. Do not revalidate unchanged input; a successful render preflights it for later saves or updates. Errors block; warnings require explicit user approval for the exact config. Suggestions do not block. Replace the complete config with suggestedConfig and revalidate before repair. Stores a 1 hour preview and returns public image URLs. Authenticated previews use the account's render allowance, and each image produced from a returned URL is another render. Anonymous previews are complimentary; their images use the anonymous image allowance.
| Name | Type | Req | Description |
|---|---|---|---|
| acknowledgeWarnings | boolean | – | Set true only after the user explicitly approves every warning returned for this exact config |
| config | string | yes | Complete chart config JSON. Mark field references must match row keys. Chronological annual values use "YYYY" strings on an explicit UTC scale. Bar and area value axes stay linear and include zero. E… |
| Name | Type | Req | Description |
|---|---|---|---|
| expiresAt | string | yes | – |
| format | string | yes | – |
| imageUrl | string | yes | – |
| mimeType | string | yes | – |
| title | string | yes | – |
| validation | object | yes | – |
| view | string | yes | – |
No examples provided.
save_chart Save chart ~290
Use this when the user wants to permanently save and publish a chart from a Szum config. Validate each generated or changed config once before rendering, saving, or updating. Do not revalidate unchanged input; a successful render preflights it for later saves or updates. Errors block; warnings require explicit user approval for the exact config. Suggestions do not block. Replace the complete config with suggestedConfig and revalidate before repair. Supply one idempotencyKey per intended chart and reuse it for retries. Returns permanent public Image and Embed URLs plus Edit and Studio links; requires authentication and saved-chart storage.
| Name | Type | Req | Description |
|---|---|---|---|
| acknowledgeWarnings | boolean | – | Set true only after the user explicitly approves every warning returned for this exact config |
| config | string | yes | Complete chart config JSON. Mark field references must match row keys. Chronological annual values use "YYYY" strings on an explicit UTC scale. Bar and area value axes stay linear and include zero. E… |
| idempotencyKey | string | – | Stable retry key of at most 255 characters; reuse only for the exact same config |
| Name | Type | Req | Description |
|---|---|---|---|
| editUrl | string | yes | – |
| embedUrl | string | yes | – |
| format | string | yes | – |
| id | string | yes | – |
| imageUrl | string | yes | – |
| manageUrl | string | yes | – |
| mimeType | string | yes | – |
| title | string | yes | – |
| validation | object | yes | – |
| view | string | yes | – |
No examples provided.
update_chart Update chart ~261
Use this when the user wants to replace and publish a saved chart's config while keeping its id and URLs. Validate each generated or changed config once before rendering, saving, or updating. Do not revalidate unchanged input; a successful render preflights it for later saves or updates. Errors block; warnings require explicit user approval for the exact config. Suggestions do not block. Replace the complete config with suggestedConfig and revalidate before repair. Refuses charts with unpublished editor changes; requires authentication and saved-chart storage.
| Name | Type | Req | Description |
|---|---|---|---|
| acknowledgeWarnings | boolean | – | Set true only after the user explicitly approves every warning returned for this exact config |
| config | string | yes | Complete chart config JSON. Mark field references must match row keys. Chronological annual values use "YYYY" strings on an explicit UTC scale. Bar and area value axes stay linear and include zero. E… |
| id | string | yes | Opaque 32-character saved-chart id |
| Name | Type | Req | Description |
|---|---|---|---|
| configUrl | string | yes | Owner-only chart-config endpoint |
| createdAt | string | yes | ISO-8601 creation timestamp |
| editUrl | string | yes | – |
| embedUrl | string | yes | Interactive-embed URL |
| id | string | yes | Opaque 32-character saved-chart id |
| imageUrl | string | yes | Rendered-image URL |
| manageUrl | string | yes | – |
| publishedAt | – | yes | ISO-8601 publish timestamp, or null when public URLs are dark |
| sizeBytes | integer | yes | Compressed size of the stored published config, excluding drafts; 0 means no published config has been stored yet |
| source | string | yes | Chart origin; an open set of string values |
| title | string | yes | Saved chart title |
| updatedAt | string | yes | ISO-8601 last-update timestamp |
| validation | object | yes | – |
| view | string | yes | – |
No examples provided.
validate_chart Validate chart config ~209
Use this when a chart config will be rendered, saved, or updated. Validate each generated or changed config once before rendering, saving, or updating. Do not revalidate unchanged input; a successful render preflights it for later saves or updates. Errors block; warnings require explicit user approval for the exact config. Suggestions do not block. Replace the complete config with suggestedConfig and revalidate before repair. Read-only, free, and fast.
| Name | Type | Req | Description |
|---|---|---|---|
| config | string | yes | Complete chart config JSON. Mark field references must match row keys. Chronological annual values use "YYYY" strings on an explicit UTC scale. Bar and area value axes stay linear and include zero. E… |
| Name | Type | Req | Description |
|---|---|---|---|
| diagnostics | array | yes | – |
| errors | array | yes | – |
| message | string | yes | – |
| suggestedConfig | object | – | Schema version 2026-03-20. Send this JSON to POST https://szum.io/validate to validate it or POST https://szum.io/chart to render a chart image. |
| valid | boolean | yes | – |
No examples provided.
What is the Charts by Szum MCP server?
Charts by Szum is an MCP server listed in the public MCP registry as io.szum/charts. Create, inspect, manage, and render charts and data visualizations as SVG/PNG or interactive embeds. This page covers its hosted endpoint (https://szum.io/mcp).
Is the Charts by Szum MCP server safe to use?
Charts by Szum scores 82 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 Charts by Szum MCP server expose?
Charts by Szum exposes 13 tools: render_chart, save_chart, list_charts, get_chart, get_chart_config, and 8 more. Their descriptions and schemas cost roughly 1,614 tokens of context every time the server is loaded.
Does the Charts by Szum MCP server require authentication?
No. We connected to Charts by Szum without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Charts by Szum MCP server still maintained?
Charts by Szum is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.