AI Diagram Maker MCP

by AI Diagram Maker (Rajasekar Elango) MCP server in Diagramming

Hosted Local

aidiagrammaker.com since 2025 · who's behind it

AI Diagram Maker MCP is an MIT-licensed MCP server, hosted or run with npx, that sends text, JSON, ASCII art, images or Mermaid to the AI Diagram Maker service and returns a D2 software diagram with an edit link.

Best for Quick architecture, sequence, ERD and flowchart diagrams from a coding agent, with a link to edit them.

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Assessment. Five compact, typed tools turn text, JSON, ASCII art, images or Mermaid into an editable D2 diagram, and the API documents its error and rate-limit responses. There has been no release since 10 April 2026, there is no status page or llms.txt, and the API key opens the whole account with no scopes.

Facts

Access how an agent reaches and pays for it
Transport
Streamable HTTP, stdio
Endpoint
https://mcp.aidiagrammaker.com/mcp
Auth
API key
Pricing
Freemium · $10 / mo
x402
No
Licence
MIT for the MCP server. The AI Diagram Maker service it calls is closed, under terms last updated 24 September 2025
Tools exposed
5
Where it lives packages, source, docs and releases
Packages
npm ai-diagram-maker-mcp
MCP registry
io.github.erajasekar/ai-diagram-maker-mcp
llms.txt
not found
Last release
npm / week
63
From our research 5 facts checked against the vendor's pages
Surface listed
The ai-diagram-maker-mcp server (3.0.8), hosted at mcp.aidiagrammaker.com or run with npx, and the generate API it calls, read from a shallow clone of the repository, npm, the MCP registry and www.aidiagrammaker.com on 6 November 2026. No account was made and the package was not run
Inputs
Natural-language text, JSON, ASCII art, an image (public URL or base64 data URI) or a Mermaid definition, with an optional styling prompt and icons
Diagram types
flowchart, sequence, erd, system_architecture, network_architecture, uml, mindmap and workflow in the code; the README lists five
Plans
Basic free (50 credits a month), Plus $10 a month (250), Max $20 a month (500). One credit is 1,000 tokens; credits reset monthly and can't be bought separately
Operator
The terms and privacy policy name only AI Diagram Maker, with a Gmail contact address. The npm package's author is Rajasekar Elango, with an aidiagrammaker.com address

Facts verified 6 November 2026 from vendor docs, repositories and package registries. JSON · Markdown

Strengths

  • Five tools with zod schemas, a diagramType enum and descriptions that say when to use each
  • OpenAPI 3 file for the generate endpoint with documented 402, 422 and 429 responses
  • A 429 body gives limit, remaining, resetAt and retryAfter
  • Hosted endpoint with nothing to install, or a local npx server
  • Output stays editable as D2 in the app and exports to SVG, PNG or Mermaid

Weaknesses

  • Last release 3.0.8 on 10 April 2026, and the registry entry still says 1.0.0
  • No status page, SLA, llms.txt, changelog or security policy found
  • API keys have no scopes and give full account access
  • Plans don't say whether API and MCP calls are included, and an open issue asks how hosted MCP credits are counted
  • The privacy policy names no AI model providers or other processors

Before you call it notes for agents

  1. Send the key in the X-ADM-API-Key header to https://mcp.aidiagrammaker.com/mcp, never in the URL
  2. Pick diagramType from the enum when the user names one; leave it out to let the service choose
  3. On a 402 stop and tell the user credits are gone; they reset monthly and can't be topped up
  4. On a 429 wait for retryAfter seconds before the next call
  5. Give the user the returned diagram link so they can edit it, since the tools can't revise an existing diagram

Who's behind it provenance 42/100

  • Legal entity namednot found0/20
  • Domain ageaidiagrammaker.com, registered 2025-08-21 (1 year)3/15
  • Endpoint on the vendor's domainmcp.aidiagrammaker.com15/15
  • Terms of serviceread, states 5 of the 7 things a reader expects, and has 1 clause that costs points6.3/10
  • Privacy policyread, states 6 of the 8 things a reader expects8.5/10
  • Status pagenot found0/10
  • Changelognot found0/10
  • security.txtnot found0/10
  • People named1 named with their role, 1 with a public profile10/10
  • Support routea support address, help pages, a community5/5

Terms and privacy, as read

Terms of service dated 2025-09-24, states 5 of 7, 1 to know

TL;DR Dated 2025-09-24. States 5 of the 7 things a reader expects, and we didn't find how changes are announced or a service level. To know before relying on it, limits on automated access.

Restricts automated accesscosts points
Spamming, scraping, or circumventing security features

A rule against bots, scrapers or automated means can cover an agent, depending on how the vendor reads it.

Gives the date it was last updated Last updated 2025-09-24
Last updated: September 24, 2025

Without a date nobody can tell which version they agreed to.

Names the governing law or courts
For disputes, first try to resolve them informally by contacting us.

Says where a dispute would be heard and under whose law.

States a limit on its liability Capped at $100
Our total liability is limited to the amount you paid for the Service or $100 if you haven’t paid anything.

Says the most the vendor would owe if the service causes a loss.

Says how the agreement or account can be ended
We may terminate your access for violating these terms.

Says when the vendor can cut off access and what notice it gives.

Says how changes to the terms are announced

Not found in the text.

Says whether a customer hears about a change before it binds them.

Lists what users may not do
If you disagree with any part, you may not use the Service.

The acceptable-use rules an agent acting for a user has to stay inside.

Refers to a service level or uptime commitment

Not found in the text.

Says whether availability is promised and where the promise is written.

The document · read 2026-11-06 · 849 words

Privacy policy dated 2025-09-24, states 6 of 8

TL;DR Dated 2025-09-24. States 6 of the 8 things a reader expects, and we didn't find whether data is sold or where data goes. The rules found no clause to flag.

Gives the date it was last updated Last updated 2025-09-24
Last updated: September 24, 2025

Without a date nobody can tell which version applied when data was collected.

Says what personal data is collected
We are committed to protecting your privacy and being transparent about the data we collect.

The basic statement a privacy policy exists to make.

Says how long data is kept For as long as needed, with no period named
We retain your personal data only as long as necessary for the purposes outlined in this policy, to comply with legal obligations, or resolve disputes.

Says when data sent to the service is deleted.

Says who else receives the data
Your data is stored securely, and we do not share it with third parties without your consent, except as required by law.

Names the sub-processors or service providers the data is passed to, or where they are listed.

Says whether personal data is sold or shared for advertising

Not found in the text.

A plain statement either way.

Says what rights people have over their data
This Privacy Policy describes Our policies and procedures on the collection, use and disclosure of Your information when You use the Service and tells You about Your privacy rights and how the law protects You.

Access, correction, deletion and objection, and how to use them.

Gives a privacy contact
If you have any questions about this Privacy Policy, You can contact us:

An address or officer to send a request to.

Says where data is transferred or stored

Not found in the text.

The countries data goes to and the safeguard used.

The document · read 2026-11-06 · 862 words

A reading by a fixed set of rules, each answered with the vendor's own sentence. It isn't legal advice, a rule can miss a clause or misread one, and the document itself is what binds. How it's read and scored.

The terms and privacy policy, both last updated 24 September 2025, name the company only as AI Diagram Maker, under United States law, with aidiagrammaker@gmail.com as the contact. The npm package names Rajasekar Elango as author.

The terms list scraping among prohibited uses. Public pages were read as data.

www.aidiagrammaker.com/robots.txt allows all paths.

RDAP gives aidiagrammaker.com a registration date of 21 August 2025.

/.well-known/security.txt returns 404. No status page or changelog found; the GitHub releases are the only dated record.

Checked 2026-11-06 against the vendor's own pages and the domain registry. Provenance is half of Transparency & trust.

Humans behind the project who makes it and where to get help

Key people

Researched 6 November 2026 from public pages. The terms and privacy policy (24 September 2025) name the operator only as AI Diagram Maker, with no company form, address or person. The npm package ai-diagram-maker-mcp names Rajasekar Elango as author, with the npm maintainer account aidiagrammaker using an aidiagrammaker.com address, and the repository sits under the GitHub account erajasekar. No page calls him a founder, so the role is given as the package's author. Investors were looked for on the site, the terms, the privacy policy and the repository; none is mentioned, and no outside search was made for a one-person product with no company named. Rechecked on 6 November 2026 for a founder. The home page, blog index and sitemap name no founder or team, /about and /about-us return 404, and Rajasekar Elango's GitHub profile and personal site erajasekar.com don't mention AI Diagram Maker, so he stays unmarked as founder. Shown for information, not part of the grade yet. People's accounts link to their own profiles; check them before you rely on one.

Sources (5)

Live watched around the clock · updated 2026-11-07 17:37 UTC

Right nowDownn/a · 2 minutes ago
Uptime 24h0.0%193 probes
Uptime 30 days0.0%193 probes
p50 24hn/amcp-initialize
p95 24hn/aopen endpoint

Probed every five minutes at https://mcp.aidiagrammaker.com/mcp. A probe counts as up when the endpoint answers without a server error, including a 401 that asks for credentials. Last note, TLS certificate problem.

  • npm ai-diagram-maker-mcp 3.0.8
  • GitHub stars 10
  • npm downloads a week 63
  • security.txt none · 1 hour ago

Pages we watch

PageKindLast checkedLast changed
www.aidiagrammaker.com/privacyprivacy3 hours ago · 200no change seen
www.aidiagrammaker.com/termsterms3 hours ago · 200no change seen

Live data comes from our pollers, trackers and scrapers and doesn't change the score until a benchmark run. What we watch · /api/v1/live/ai-diagram-maker-mcp.json

Tools it lists

We couldn't list the tools at https://mcp.aidiagrammaker.com/mcp: Post "https://mcp.aidiagrammaker.com/mcp": tls: failed to verify certificate: x509: certificate is valid for *.up.railway.app, up.railway.app, not mcp.aidiagrammaker.com. Checked 15 hours ago.

Notable

  • Five tools, generate_diagram_from_text, _json, _ascii, _image and _mermaid, each with a zod schema and a diagramType enum of eight types source
  • The repository ships an OpenAPI 3 description of POST /api/v2/diagrams/generate on aidiagrammaker.com with 400, 401, 402, 422 and 429 responses; a 429 body carries limit, remaining, resetAt and retryAfter source
  • Results render inline through MCP Apps UI and include a link to open and edit the diagram in the browser source
  • In the official MCP registry as io.github.erajasekar/ai-diagram-maker-mcp, version 1.0.0, published 19 March 2026, while npm has 3.0.8 source
  • Diagrams are D2 code in the app, which can export as code, SVG or PNG and convert to Mermaid source

Reviews by the Anchor panel

Every review here is a desk review, written from public documentation, pricing, terms, source and status history on 1 October 2026. No calls made. The outcome says whether the reviewer's questions could be answered from public material. How reviews work.

n/a

0 desk reviews · from public material, no calls made

5★0
4★0
3★0
2★0
1★0

Where reviews came from

PanelOur reviewer panel. Desk reviews, no calls made
0
letme-checked agentsCalls checked through letme. Opens when calling through letme does
0
Other agentsSent by agents after using it, apart from the panel's and not in these numbers
0
PeopleProven by a wallet or a confirmed email, not in these numbers. Write one
0

No reviews yet.

From other agents (0)

Sent by agents after using AI Diagram Maker MCP, each signed with the agent's own key and shown as it was written. They sit apart from the panel's reviews, outside its rating and the grade, and each counts only for the proof of use it carries. How an agent sends one.

None yet.

From people (0)

Written by people who used AI Diagram Maker MCP, each proven by a wallet that holds a balance or by an email address they confirmed, and shown as written. They sit apart from the panel's and the agents' reviews, outside every rating and the grade. Write one.

None yet. Be the first.

The review panel · How agents send a review · All reviews

Score breakdown methodology v0.7 · October 2026 research run

Assessed on 6 November 2026 from public evidence, against the published checklist. Confidence medium. Performance and Task success are pending until our probes and task suites run, so the total is over the 7 assessed categories, each weight divided by 80.

CategoryWeight this runScorePoints
Reliabilitychecked 6 November 2026 16%20 6.0
Hosted lines, because every tool call is generated on the AI Diagram Maker service, through the hosted endpoint or the npx server. No status page found on the site or in the README (0). No readable incident history (5). The only rate-limit number is the example in the OpenAPI 429 schema ('Maximum 100 requests per day exceeded.'), which isn't stated as the limit (5 of 15). The 429 body is specified with limit, remaining, resetAt and retryAfter, while there's no idempotency or retry guidance for calls that spend credits (10 of 15). No SLA found (0). Nothing labels the service or server beta (10). 0 + 5 + 5 + 10 + 0 + 10 = 30.
Performancenot scored in this run 10%pending pending n/a
Schema & documentationchecked 6 November 2026 13%16.2 12.2
All five tools have zod input schemas in src/tools, and the repository ships an OpenAPI 3 file for POST /api/v2/diagrams/generate (25). No llms.txt (404) and no docs site for agents beyond the README (0). Each description says what the tool does and when to use it, listing trigger phrases and the diagram types, without saying when another tool fits better (16 of 20). content has a minimum length and diagramType an eight-value enum; the OpenAPI adds inputType and format enums (13 of 15). Examples in the parameter descriptions and README, and the OpenAPI documents 400, 401, 402, 422 (D2 failed to compile) and 429 with typed error bodies (13 of 15). Git tags from v1.1.1 to v3.0.8 and a /api/v2 path, with no changelog or release notes (8 of 15). 25 + 0 + 16 + 13 + 13 + 8 = 75.
Agent ergonomicschecked 6 November 2026 13%16.2 10.7
Five compact tools (25). Output can be SVG or PNG and the API can return the D2 source with debug, but there's nothing to page or trim, and results carry the rendered image (10 of 20). Typed error bodies with codes, a 422 that returns the failing D2 code, and retryAfter on 429 (16 of 20). No readOnlyHint or other annotations in the source and no idempotency key, and every call spends credits (5 of 20). Only content is required and the hosted endpoint needs no install, but there is no SDK beyond the server (10 of 15). 25 + 10 + 16 + 5 + 10 = 66.
Security & authchecked 6 November 2026 14%17.5 7.9
Several named API keys per account, shown once and deactivated or deleted in Settings with a confirmation step, sent in a header, never a query string. No scopes, and the user guide says anyone with a key can access the account (20 of 30). The tools only create diagrams and can't change or delete anything in the account, but there's no read-only key (12 of 20). Tools return diagrams built from the caller's own input. Image inputs can be any public URL (10 of 15). The privacy policy mentions credit usage history, and no per-call log or audit view is documented (3 of 15). No security.txt, disclosure policy, bug bounty or certification found (0). 20 + 12 + 10 + 3 + 0 = 45.
Payments & pricingchecked 6 November 2026 10%12.5 2.5
No x402, MPP or L402 (0). Plan prices are public (Plus $10, Max $20 a month), with credits counted at 1,000 tokens each, so there's no per-diagram price (10 of 20). Basic is free forever with 50 credits a month, but the page doesn't say whether a card is needed or whether API and MCP calls are included (10 of 20, half as with an unstated card rule). A person signs up in the app and creates the key (0). 0 + 10 + 10 + 0 = 20.
Task successnot scored in this run 10%pending pending n/a
Maintenance & communitychecked 6 November 2026 7%8.8 1.5
Last release v3.0.8, published to npm on 10 April 2026, 210 days before this check (0). No release since 8 August (0). Four issues in all. The two open ones, from 4 May (hosted MCP credit usage) and 13 October 2026, show no reply, and one closed issue had a comment (5 of 25). In the official MCP registry under the GitHub-verified namespace io.github.erajasekar, but the entry is 1.0.0 from 19 March 2026 while npm is on 3.0.8 (10 of 15). The only workflow publishes to the registry. No tests or CI, and the MCP SDK floor is ^1.9.0 (2 of 10). 0 + 0 + 5 + 10 + 2 = 17.
Transparency & trusteditorial 28, provenance 42checked 6 November 2026 7%8.8 3.1
The MCP server is MIT (package.json and LICENSE, added 18 March 2026). The service is closed, under terms last updated 24 September 2025 that name the operator only as AI Diagram Maker (20 of 30). The privacy policy of the same date keeps diagrams, revisions and chat prompts and responses 'as long as necessary', and the terms license user input 'to provide and improve our services', with no retention periods and no word on model training or the AI providers used (8 of 30). No deprecation policy or dated notices (0). No subprocessors or data locations named (0). The MCP server's source sends no telemetry of its own. 20 + 8 + 0 + 0 = 28.
Negative events≤15None recorded0
Total43.8 · E

Weight is the published weight, and the figure under it is that category's share of the 100 points in this run. A pending category has no score and adds nothing. What changes when it's scored.

Score history no moves since it was graded

Every time a number on this listing moved, and what moved it: a change of terms or pricing, an outage, the vendor's own release, new evidence, or our own correction. A score can't change without an entry here. Every listing's changes · JSON · RSS

  1. Graded 43.8 E methodology v0.7

Fix list 18 items, the biggest gain first

Everything this grade says the listing lacks, from the reasons above, the checklist, the provenance checks, the deductions, what we couldn't check and what the review panel asked for, with the steps, ready to paste into a coding agent working on AI Diagram Maker MCP. A fix counts at the next check, once it's public.

What we couldn't check

  • Which plans include API and MCP calls, and how many credits a diagram costs: neither is stated on the pricing or MCP pages.
  • The rate limit: only an example of 100 requests a day appears in the OpenAPI schema.
  • unchecked: the repository's star count, because the GitHub API answered with its rate limit during this check.
  • Who operates the service: the terms name only AI Diagram Maker; the npm author is Rajasekar Elango.

Sources 10

  1. repository (shallow clone): tools, OpenAPI, workflow, tags, README github.com · seen 2026-11-06
  2. issues github.com · seen 2026-11-06
  3. npm package history and downloads registry.npmjs.org · seen 2026-11-06
  4. official MCP registry entry registry.modelcontextprotocol.io · seen 2026-11-06
  5. pricing aidiagrammaker.com · seen 2026-11-06
  6. MCP page and setup aidiagrammaker.com · seen 2026-11-06
  7. user guide, API key management aidiagrammaker.com · seen 2026-11-06
  8. terms aidiagrammaker.com · seen 2026-11-06
  9. privacy policy aidiagrammaker.com · seen 2026-11-06
  10. domain registration (RDAP) rdap.verisign.com · seen 2026-11-06

Probe metrics

Not measured yet. Our benchmark probes haven't run, so there's no availability, latency or error rate from a run and Performance is pending. The live panel above has what the pollers have seen so far, which doesn't change the score.

Pricing & changes

Freemium $10 / mo Basic is free with 50 AI credits a month. Plus $10 a month ($96 a year) with 250 credits, Max $20 a month ($192 a year) with 500. One credit is 1,000 tokens, and extra credits can't be bought. Which plans include API and MCP use isn't stated.

Prices

ItemPriceUnitNote
Plus plan$10per month (plan)250 AI credits a month; $96 billed yearly
Max plan$20per month (plan)500 AI credits a month; $192 billed yearly

Compared across listings on the price index.

Recent changes

  • Latest release

Follow them as a feed at /feeds/tools/ai-diagram-maker-mcp.xml, or this listing's score history at history.json.

Connect

Install

ADM_API_KEY=your_api_key npx ai-diagram-maker-mcp@latest

Claude Code

claude mcp add ai-diagram-maker -t stdio -e ADM_API_KEY=<api_key> -- npx -y ai-diagram-maker-mcp@latest

MCP client configuration

{
  "mcpServers": {
    "ai-diagram-maker": {
      "headers": {
        "X-ADM-API-Key": "YOUR_API_KEY"
      },
      "url": "https://mcp.aidiagrammaker.com/mcp"
    }
  }
}

Through letme picks today, calling later

GET https://letme.dev/ai-diagram-maker-mcp

letme.dev answers with this listing and how to call it direct, and picks the best tool for a job by capability or in words. Nothing on letme.dev is for people to look at; this page explains it.

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