How do I install EchelonGraph CVE & Exposure?

Copy the http config for Cursor, Claude Desktop, Claude Code, or VS Code on this page. It uses the publisher's install, not a PlugMCP proxy.

Does EchelonGraph CVE & Exposure need an API key?

The publisher lists these environment variables: ECHELONGRAPH_API_BASE, ECHELONGRAPH_API_TIMEOUT_MS.

What transport does EchelonGraph CVE & Exposure use?

EchelonGraph CVE & Exposure is reached over HTTP.

When was EchelonGraph CVE & Exposure last checked?

Last checked 2026-11-09. CVE, KEV, EPSS, SBOM and advisory lookups; per-CVE exposure from Shodan data (© Shodan). Keyless.

EchelonGraph CVE & Exposure MCP server

EchelonGraph MCP server

CVE and internet-exposure data for Claude, Cursor, VS Code, Cline, and any MCP client, straight from EchelonGraph's free public feed.

It exposes EchelonGraph's CVE Pulse (NVD + MITRE-CNA pre-NVD + CISA-KEV + EPSS + GitHub GHSA, fused into one score) plus a per-CVE internet-exposure footprint: how many internet-facing services (distinct ip:port) EchelonGraph's KEV-exposure radar has on record running a version that maps to the CVE. Exposure counts are derived from Shodan data. Shodan data is owned by Shodan, which holds its copyright (© Shodan).

Its 16 tools look up one CVE (record, exploit code and fixed versions, how it is fixed as its sources state it, EPSS history, vendor advisories, exposure footprint), list CISA's newest KEV additions, check whether a product or package version is affected, check an SBOM or a project's lockfiles, and read a CWE and its CVEs. Every result says how it was measured (state, measured_at, method, coverage, freshness, notes), so a model cannot mistake an outage or an unassessed lookup for an all-clear.

It also serves five prompts, ready-made workflows a client can show as slash commands (triage_cve, kev_weekly_brief, am_i_affected, sbom_review, workload_triage; see "Prompts"), two resources (echelongraph://methodology and echelongraph://sources) and one resource template (cve://{cve_id}; see "Resources").

Free and keyless: no API key, no auth, read-only. The server makes no request other than the API call a tool needs to answer.

npm: echelongraph-mcp · Official MCP Registry: io.echelongraph/echelongraph-mcp · Docs: https://echelongraph.io/pulse/mcp
Source: https://github.com/echelongraph/echelongraph-mcp · Changes: CHANGELOG.md · Security: SECURITY.md
Also listed on: Smithery · Glama

Quick start

The local server runs through npx and needs Node.js 20 or later; nothing is installed globally. Claude Desktop's one-click extension, below, needs neither. Add one of the blocks below to your client, quit it fully and reopen it, then ask: "Is CVE-2023-44487 actively exploited, and how many exposed services does EchelonGraph's radar have on record for it?"

Claude Desktop

Three ways in. The first two need no Node.js: a one-click extension that runs the server on your machine, and a custom connector to the hosted endpoint. The third runs the server through npx.

1. Install in Claude Desktop (one click, no Node.js). The link downloads echelongraph-mcp.mcpb, a Claude Desktop extension. Open it, or in Claude Desktop choose Settings → Extensions → Advanced settings → Install Extension and pick it, then choose Install. Claude Desktop runs the server with the Node.js it ships and writes its own configuration: no PATH and no JSON to edit. To update, install the next release's bundle the same way. Every new release on GitHub carries the bundle (releases up to 2.6.5 do not), built from the release's tag by the workflow that publishes the npm package, and signed with a SLSA build-provenance attestation. To check a download: gh attestation verify echelongraph-mcp.mcpb --repo echelongraph/echelongraph-mcp.

2. Custom connector (no install). Claude Desktop uses your claude.ai account's connectors: Customize → Connectors → + Add → Add custom connector. Name it EchelonGraph, paste https://mcp.echelongraph.io/mcp, choose No sign in, and add it. No Node.js, no PATH and no JSON to edit. A connector added on claude.ai shows up in Claude Desktop too, and the plan rules are claude.ai's (see "Remote (no install)" below).

3. Local server through npx.

Check Node.js. In Terminal (macOS) or PowerShell (Windows), run node -v. It must print v20 or later. If it prints an older version or command not found, install the LTS release from https://nodejs.org, or on macOS with Homebrew run brew install node.
Open the config file in a plain-text editor. Settings → Developer → Edit Config shows claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/claude_desktop_config.json; Windows: %APPDATA%\Claude\claude_desktop_config.json). Open it in a plain-text editor such as VS Code, Notepad or nano. TextEdit on macOS turns " into curly quotes (“ ”) when Smart Quotes is on, and the JSON then breaks without an error: turn it off under Edit → Substitutions → Smart Quotes, or use another editor.
Merge, do not replace. The file usually exists already and holds Claude Desktop's own settings (for example a "preferences" object). Keep everything in it. Add an "mcpServers" key at the top level, next to the keys already there; if "mcpServers" is already there, add the "echelongraph" entry inside it. Mind the comma between entries. The result looks like this, with your own settings where preferences is:
```
{
  "preferences": {
    "…": "the settings already in your file stay as they are"
  },
  "mcpServers": {
    "echelongraph": {
      "command": "npx",
      "args": ["-y", "echelongraph-mcp"]
    }
  }
}
```
To check that the file parses, run this in Terminal (macOS):
```
node -e "JSON.parse(require('fs').readFileSync(process.argv[1], 'utf8'))" "$HOME/Library/Application Support/Claude/claude_desktop_config.json"
```
or this in PowerShell (Windows):
```
node -e "JSON.parse(require('fs').readFileSync(process.argv[1], 'utf8'))" "$env:APPDATA\Claude\claude_desktop_config.json"
```
No output means valid JSON. A SyntaxError means the file is broken (often curly quotes or a missing comma); ENOENT means there is no file at that path yet.
Quit fully, then reopen. Closing the window leaves the old config loaded. On macOS choose Claude → Quit Claude (⌘Q); on Windows right-click the Claude icon in the system tray and choose Quit. The first start can take longer while npx downloads the package.

Troubleshooting Claude Desktop

spawn npx ENOENT (or the server shows as failed). On macOS, an app opened from the Dock does not get your shell's PATH, so Claude Desktop cannot find npx where Homebrew (Apple silicon: /opt/homebrew/bin; Intel: /usr/local/bin) or nvm put it. Run which npx in Terminal, then give Claude Desktop that absolute path as "command", and the folder it is in as PATH under "env" (npx starts node from that same folder). With Homebrew on Apple silicon:
```
{
  "mcpServers": {
    "echelongraph": {
      "command": "/opt/homebrew/bin/npx",
      "args": ["-y", "echelongraph-mcp"],
      "env": { "PATH": "/opt/homebrew/bin:/usr/bin:/bin" }
    }
  }
}
```
With nvm, use the full path which npx prints (JSON does not expand ~). Then quit fully and reopen. On Windows, install Node.js with the installer from nodejs.org, which adds npx to the system PATH, then quit Claude Desktop fully and reopen it.
The server does not appear at all. The file is not valid JSON (a missing comma, or curly quotes), or the app was not fully quit: see steps 2 to 4.
Logs. macOS: ~/Library/Logs/Claude/mcp-server-echelongraph.log (this server's output) and ~/Library/Logs/Claude/mcp.log (connections). Windows: %APPDATA%\Claude\logs\, with the same file names.

Claude Code

claude mcp add --transport stdio echelongraph -- npx -y echelongraph-mcp

Add --scope user before the -- to make it available in every project, or --scope project to share it through the project's .mcp.json. Claude Code hands the model each result's structuredContent, which this server holds to 30,000 characters unless a call passes full: true (see "Long answers"); MAX_MCP_OUTPUT_TOKENS (25,000 tokens by default) is the cap Claude Code applies to a tool's output, and raising it lets a full: true answer through.

Cursor

~/.cursor/mcp.json (every project) or .cursor/mcp.json (one project):

{
  "mcpServers": {
    "echelongraph": {
      "command": "npx",
      "args": ["-y", "echelongraph-mcp"]
    }
  }
}

VS Code

.vscode/mcp.json in the workspace (VS Code's key is servers, not mcpServers):

{
  "servers": {
    "echelongraph": {
      "command": "npx",
      "args": ["-y", "echelongraph-mcp"]
    }
  }
}

or from a terminal:

code --add-mcp '{"name":"echelongraph","command":"npx","args":["-y","echelongraph-mcp"]}'

Windsurf, Cline and other clients

Clients that read an mcpServers block (Windsurf's mcp_config.json, Cline's MCP settings, and most others) take the same block as Cursor above.

Remote (no install)

The same 16 tools, five prompts, two resources and one resource template are served over Streamable HTTP at:

https://mcp.echelongraph.io/mcp

Keyless, no sign-in, stateless; both protocol eras. The hosted endpoint is in service: https://mcp.echelongraph.io/health answers {"status":"ok","version":…} with the package version it runs.

claude.ai (Free, Pro, Max, Team and Enterprise plans): Customize → Connectors → + Add → Add custom connector. Name it EchelonGraph, paste the URL, choose No sign in, and add it. On Team and Enterprise an Owner adds it for the organization first, and each member then connects it. Free plans allow one custom connector.

Claude Code:

claude mcp add --transport http echelongraph https://mcp.echelongraph.io/mcp

Cursor (mcp.json):

{ "mcpServers": { "echelongraph": { "url": "https://mcp.echelongraph.io/mcp" } } }

VS Code (.vscode/mcp.json):

{ "servers": { "echelongraph": { "type": "http", "url": "https://mcp.echelongraph.io/mcp" } } }

Windsurf (mcp_config.json):

{ "mcpServers": { "echelongraph": { "serverUrl": "https://mcp.echelongraph.io/mcp" } } }

The hosted endpoint runs this package's code (dist/http.js, below) against the same public API, so its answers are the npm package's answers. What it sees and logs is under "Privacy", and its per-client limit under "Rate limits".

Tools

Every tool is read-only (readOnlyHint: true) and declares a title and an outputSchema. The example questions are ones a client can answer with that tool alone.

Tool	Title	What it answers	Example question
`cve_summary`	CVE feed summary	Counts of active CVEs by severity band, the count with no severity band from any source (`summary.none`, sent again as `summary.unscored`: CVEs not yet scored, not a rating of None), the same CVEs counted by NVD's severity label, as provenance (`summary.nvd_critical` to `summary.nvd_none`), the rejected (withdrawn) records outside the total (`summary.rejected`), and when the feed was last updated.	How many critical CVEs does the feed hold, and when was it last updated?
`search_cves`	Search CVEs	Search/filter CVEs (severity, min CVSS, text, sort) with EchelonGraph scores and `score_assessed`; page with `limit` and `offset`; the note names each row not yet scored.	Find critical CVEs that mention Tomcat with a CVSS of 9 or more.
`get_cve`	CVE detail	One CVE's record: CVSS v3 and (when scored) v4, the EchelonGraph score and its confidence, whether EchelonGraph has scored it (`score_assessed`), EPSS, CISA-KEV status and known ransomware use and, for a KEV-listed CVE, CISA's own text relayed verbatim (`kev_required_action`, the action CISA requires of US federal civilian agencies, not EchelonGraph's advice; `kev_short_description`; `kev_notes_urls`), the GitHub GHSA id, references, and its published, modified and `updated_at` times.	What are CVE-2024-3094's CVSS, EPSS and CISA-KEV status?
`cve_exposure`	Internet exposure for one CVE	Internet-exposure footprint for a CVE: exposed service count (distinct ip:port, the `exposed_hosts` field) + country/product breakdown, from the KEV-exposure radar.	How many exposed services does EchelonGraph's radar have on record for CVE-2023-44487?
`exposure_radar`	Exposure radar totals	Aggregate totals across the exposure radars: services running CISA-KEV CVEs; unauthenticated data stores and observability UIs, found through Shodan (LeakIX when Shodan query credits run low) and then confirmed by EchelonGraph's own identified check, which is not a pure read (on Redis it names its client; on ClickHouse its query lands in the server's query log); leaked credentials; shadow AI; and MCP servers found in EchelonGraph's own Certificate Transparency feed, by RFC 9728 verdict, protocol era and transport. Every number is labelled by what it counts, and a field the tool cannot label is left out and named.

The three vendor-advisory tools relay vendor_published_at (the vendor's date), our_first_seen_at (when EchelonGraph first recorded the advisory) and withdrawn (the vendor rescinded it; the note names each one, and the search leaves them out).

Each also relays every vendor's window in coverage (vendor_windows, or vendor_window for the detail): the advisories held, the earliest and latest vendor_published_at among them, held_since and history_backfill. held_since is the start of the window EchelonGraph has read the vendor's advisories from: one published before it may not be held. For a vendor with no history read (history_backfill not_supported) it can be years after the earliest advisory held: Cisco's poller first read the advisories Cisco had changed in the last 90 days, Red Hat's and GitHub's the last 7, so an older advisory the vendor revised later is held while the ones published beside it are not. vendor_advisories_for_cve lists in vendors_not_fully_held each vendor with no advisory in the answer of which EchelonGraph holds none, whose held_since is after 1 January of the CVE ID's year or not known, or whose history is still being read: no advisory from such a vendor is not a finding that it published none.

Every figure is as fresh as the last check that produced it. The CVE feed is polled from its sources on a schedule. Each radar has its own schedule and refreshes only while it runs, and exposure_radar's freshness gives each radar's last completed check (last_run_at) where the API serves one.

How each tool reads its answer

What each tool relays, field by field, and what each number counts, is in the pages below, which ship in the package's docs/ folder:

How cve_summary reads its counts: summary.none counts CVEs not yet scored, not CVEs rated None, and summary.nvd_critical to summary.nvd_none count by NVD's severity label (or a pre-NVD label standing in), as provenance.
How get_cve and search_cves read the EchelonGraph score: score_assessed: false is not yet scored, never a score of 0.
What patch_available says, and the evidence patch_evidence names, the CVE record's own fix statement among it (cna_solution, description_fix): false means no fix evidence is on record, not that no fix exists.
How cve_exposure counts: a count of ip:port services, not machines, inferred from banner versions in a sample of Shodan data, and for a CVE outside the radar's tracked set NOT ASSESSED: its 0 is not a measurement.
How exposure_radar counts: every number of its five radars, each labelled by what it counts.
How check_affected decides: read assessed before count; a registry match's fixed_in is the lowest version above it that no affected interval of the record holds, or null with fixed_in_reason.

Prompts

Ready-made workflows a client can show as slash commands. Each prompt names the tools to call, in order, and tells the model to read every result's state, measured_at, method, coverage and notes: not_assessed is never reported as clean, a count of 0 under assessed: false is never "not affected", and each figure cites its measured_at. A prompt makes no API request.

Prompt	Arguments	What it asks the model to do
`triage_cve`	`cve_id`	`get_cve` (with CISA's due date, `kev_due_date`, when the CVE is KEV-listed), `cve_intel`, `vendor_advisories_for_cve`, `epss_history` and `cve_exposure`, then a decision template: exploited, likelihood, reachable, patch, deadline, decision. The patch line gives each affected range with its fix from `cve_intel`'s `fixed_branches`; where a package has none, it gives `fixed_version` as what `cve_intel` records for the package, one per package (the advisory's last range's as a rule), never as the fix for every affected branch, and points to `get_cve`'s references tagged Vendor Advisory or Patch for a branch's fix.
`kev_weekly_brief`	`days` (1 to 365, default 7)	Work out the start date from `days`, page through `kev_recent` from it 50 rows a page, and write a brief grouped by vendor with ransomware flags and due dates.
`am_i_affected`	`product`, or `ecosystem` and `package`; `version`	`check_affected`, read `assessed` before `count`, with the not-assessed wording.
`sbom_review`	`sbom` (CycloneDX or SPDX JSON text, up to 5,000,000 characters)	Pass the document to `check_sbom` (and, once more, the purls a rate limit or the time budget left unsent: `data.not_sent_purls`, or, where the text or a `DATA CUT` cuts that list, the document's purls from the position and in the order its note gives), read each component's ecosystem, package and version from its purl, as `check_sbom` maps them (every purl type it maps, and `deb`, `apk`, `alpine` and `rpm` by a `distro` qualifier naming a Debian, Ubuntu or Alpine release; any other is unknown, and given no fixed version; a `deb`, `apk` or `alpine` purl with an `upstream` qualifier as the source package that qualifier names, the row's when its is , which the fix list names beside the purl), look up each affected CVE with and , and write a fix list ordered by CISA-KEV listing, then EPSS, then score, each key stated. Where the text keeps a match, its fixed version is the match's alone, the lowest version above the installed one that no affected interval of the record holds, and a null is written "no fix on record", which is not a finding that no fix exists; no fixed version is read from . Where the text keeps no match for the component, or a match has no , a fixed version is given only above the installed version: the first above it that no range of the row's holds, else, for a package without , 's , which is one per package (the advisory's last range's) and need not be the fix on the component's branch; otherwise the line says the results give no fixed version for that branch and points to the CVE's advisory.

Resources

Two resources, which resources/list lists, and one resource template, which resources/templates/list lists (a client reads cve://CVE-2024-3400, for example):

Resource	What it holds
`echelongraph://methodology`	What each envelope field and `state` value means, and how each tool measures (Markdown).
`echelongraph://sources`	What the API reports about its feeds when the resource is read: the NVD poller's `interval`, `last_poll_at`, `poll_count` and `poll_errors`, all of the one instance that answered (from `/api/v1/public/cves/summary`; the two counts are that instance's since it last started, zeroed on every restart, never the feed's reliability), and the CISA KEV catalog's last successful fetch and method (from `/api/v1/public/kev/recent`). It names the feeds no endpoint reports a schedule for, and states none for them (JSON).
`cve://{cve_id}`	One CVE as `get_cve` returns it: the structured result, envelope and record, as JSON. Past 30,000 characters of JSON, `data` is cut as `get_cve`'s first text block is, `data_truncated` is `true`, `truncated` names each list cut, and a note starting `DATA CUT` says what the cut leaves out; `get_cve`'s `structuredContent.data` holds the record whole with `full: true`. An ID that is not a CVE ID is refused before any request; a CVE the API has no record of is not found.

What a result means

Every tool answers in one of two shapes, so a model reading the result cannot mistake an outage for an all-clear:

Success — the first text block is the API's JSON verbatim (cut to fit 30,000 characters when it is longer: see "Long answers" below); the second is a one-line note saying the call succeeded, which base URL answered, and what it found; the third is the structured result as JSON, less what the first two already say (below). When the feed genuinely holds nothing for the query the note says so in words ("we looked and found nothing … not a lookup failure"), because a measured zero is a measurement. The exceptions to verbatim are cve_summary, which leaves out a poller field the answer sends in a JSON type other than its outputSchema's (or a poller that is neither a JSON object nor null) and names it in the note, and exposure_radar: each radar is cut to the fields docs/exposure-radar.md lists, and each kev_exposure.newest_kev row gains an exposure_state. Its shadow_ai counts are regrouped as that page says, and its poller block carries only running and last_run_at, or is dropped when it carries no real completion time. The block's other fields describe the server instance that answered, not the radar. Its last_run_at is when the radar's leader last completed a Certificate Transparency (crt.sh) cycle, and its running is true only when that was within 30 minutes of the answer. When running is true, the note says the radar's leader last completed a cycle at that time; when it is false, the note says no cycle has completed since that time; when last_run_at is absent, the note says the radar's freshness is unknown and the block is left out. An older API answered from whichever server instance served the request, and a follower instance sent running: false with the zero time 0001-01-01T00:00:00Z; that too is unknown freshness, never presented as a stopped radar.
Failure — an MCP error result (isError: true) whenever the lookup did not complete: the host could not be reached, it answered non-2xx, it took longer than the timeout, or it answered 2xx with a body that is not a JSON object. The text names the tool, the cause (status code or error kind), the path, and the base URL, and says it is not a finding; the second text block is the structured result as JSON, less the message's sentences (below). A failure is never rendered as a success with null fields.

Both shapes also carry a structured result, below, and repeat it in their last text block, less what an earlier block already says, so a client that passes only content to the model still sees how the answer was measured. The first text block (the API's JSON, or the failure) and the note after it are where 1.x put them.

Long answers

A model pays for every character it reads, and clients differ in which part of a result they hand it, so each part is held to the same budget, 30,000 characters, and each is cut on its own terms:

Claude Code hands the model structuredContent, not the text blocks, and sizes it against MAX_MCP_OUTPUT_TOKENS (25,000 tokens by default): it warns past 10,000 tokens and, past the cap, saves the result to a file and hands the model its path instead. Through 2.7.x structuredContent.data was always the answer whole: get_cve for CVE-2021-44228 was 65,540 characters of structuredContent on production's answer of 2026-10-11, beside a first text block of 23,759, and Claude Code saved it to a file. Since 3.0.0 the structured result is cut to fit (below). MAX_MCP_OUTPUT_TOKENS, set in the environment Claude Code starts in, raises its cap.
A client that passes only the text blocks (content) reads the first text block, cut to fit as described after the next item.
A program that reads structuredContent.data and needs the answer whole, however long, passes full: true: every tool takes it. A client that sizes structured results, as Claude Code does, can refuse such an answer past its cap.

The structured result. When the whole of it (the envelope, its notes and data, as compact JSON) would pass 30,000 characters and the call does not say full: true, data is cut, in an order each tool states. Where one row is large, every row is first thinned, all rows kept: check_sbom and scan_manifest keep each row's index, purl, verdict, not_assessed_reason, cve_ids, matched_package and matched_via, and per match cve_id, kev_listed, ransomware, epss_score, effective_score, score_assessed, fixed_in and fixed_in_reason, every field a prompt reads from a match, then each row's matches to at most the same number, its first, a row so cut carrying matches_truncated (its total, and the KEV-listed and ransomware CVE IDs and fixed_in versions of all its matches), then each match to cve_id, kev_listed, ransomware, fixed_in and effective_score, then each row to index, purl, verdict, not_assessed_reason and cve_ids (rows leave at the compact level; the rows kept take back detail in order); check_affected keeps each match's scores, flags, criteria and fixed_in, then fewer; cve_remediation drops each item's product_ids, then its text, keeping every advisory's state, kinds, URLs and fixed builds (get_vendor_advisory returns each text), thins fixed_branches (then caps each package's ranges) and patches, then cuts fix_references, then patches, then fixed_branches, advisories last, the note naming vendor_advisories_for_cve, which lists them all; search_cves keeps each row's description and scores, then the scores alone; the vendor-advisory tools drop affected_products, then summary. Only then do rows leave: check_sbom and scan_manifest cut not_checked, then not_sent_purls, whole or none (the note says how to get it), then drop the not_affected rows, then the not_assessed ones ( counts every verdict), and only then affected rows, from the end; drops its and samples first and its , which names every match, last; the other row tools drop rows from the end, and those that page say the or to read them from ( and also the page size whose rows fit whole, counted on the rows whole). cuts and , each to at most the same number of entries, then ; cuts its daily and weekly series, each keeping its newest entries, then every ranking, then ; then any other list at the top of is cut the same way. The room left once a list fits goes back to the lists emptied before it, as many of their entries as fit (their first, a series its newest). No string is shortened and no value changes (a thinned row keeps some of its fields, each optional in the outputSchema, so still validates; a cut adds only and ). The result then says ( on every other success), gives each list cut, by its path in , with its , the number and, where its entries are thinned, , and the note ends with sentences starting that say what was cut, how to read the rest and that the same call with returns whole.

The first text block. Through 2.6.2 it was the API's JSON whatever its size: on production's answers of 2026-10-04 a default search_cves page for "openssl" was 133,300 characters of text, get_cve for CVE-2021-44228 80,897, check_affected for the Linux kernel at 5.10.0 364,408, kev_recent at its largest page 105,925 and search_vendor_advisories at its largest page 103,147. So when the API's JSON is longer than 30,000 characters, the first text block holds it cut to fit, cut from the answer whole (not from the cut data), the same way with or without full: true. First the same JSON is laid out with each row on a line of its own, which drops no character of the answer but the indentation. If that is still too long, a tool that returns a list of rows cuts each row to the fields it names, most kept first (search_cves keeps cve_id, severity, cvss_v3_score, echelongraph_score, score_assessed, epss_score, kev_listed and the first 200 characters of the description, among others), with every long string ending in "…". A list beside the rows is cut before any row field the first level keeps, and before any row leaves the text: check_affected's excluded and undetermined samples keep their first 10 entries, each its cve_id and reason, and its cve_ids (each match's cve_id, in order) its first 10, so that every CPE match stays in the text, each with at least cve_id, kev_listed, ransomware, epss_score, effective_score and score_assessed (and fixed_in on a registry match; a registry list near the cap of 200 can leave its last matches out, 15 of 200 beside 50 undetermined, and the note says how many), and check_sbom's not_sent_purls keeps its first 10, the note saying from which position of the input the purls not sent run, and in what order the input's purls are counted, so that a second call can send them without reading the list. scan_manifest cuts its rows as check_sbom does, and its not_checked list keeps its first 20 entries. When even the leanest cut is too long, rows are left out of the text (check_sbom and scan_manifest leave out the not_affected rows first, then the not_assessed ones), and the note says how to read them: the offset to call next, or a smaller . Any other answer keeps the first entries of each of its lists ('s and ). The note then ends with one sentence starting that says what the first text block leaves out and which tool returns a row (, , , and a CVE's fixed versions): whole in that tool's with , since its own first text block is cut past 30,000 characters too. An answer that fits is sent as before, pretty-printed and whole. The same answer is always cut the same way. The resource reads 's record whole and cuts its as 's first text block is cut, and says so: , naming each list it cut, and a note starting . The prompts ask only for what the text keeps: reads 50 rows a page, which the text holds whole; reads CISA's due date from ; and reads each match's , and 's where the text keeps no match for a component.

Structured results

Since 2.0.0 every result, success or failure, carries structuredContent, and every tool declares its shape as an outputSchema in tools/list, with a title and the annotations readOnlyHint: true, destructiveHint: false, idempotentHint: true and openWorldHint: true (hints, which a client treats as untrusted).

Field	What it holds
`state`	`measured`, `not_assessed`, `failed` or `invalid_input` (below).
`measured_at`	When the underlying observation was made, as the API states it. `null` when the answer does not say or holds no observation; never the Go zero time.
`method`	How the numbers were produced. `null` on a failure.
`coverage`	What the answer covers, where the tool can say: `in_scope` for `cve_exposure`, the list's own account of its count for `search_cves`, the radars that answered for `exposure_radar`, and `assessed`, `not_assessed_reason`, the lookup path and the match counts for `check_affected`.
`freshness`	The producing radar's last completed check (`last_run_at`), where the API serves one; `null` where it serves none.
`notes`	The caveats, one sentence each: what the envelope itself needs saying, then the note from the text block.
`data_truncated`	On a success only: `true` when `data` is cut (`DATA CUT`, see "Long answers"), `false` when it is the answer whole.
`truncated`	When `data_truncated` is true: each list cut, by its path in `data`, with `total`, `returned` and, where its entries keep only some of their fields, `thinned: true`.
`data`	On a success only: the API's JSON, whole with `full: true`, and by default cut when the structured result would pass 30,000 characters (`DATA CUT`): the first text block carries the same JSON, or, past 30,000 characters, a cut of the whole answer that the note names (`TEXT CUT`).
`error`	On a failure only: `kind`, `path`, `status` and .

The last text block of every result is this structured result serialized as JSON, less what an earlier text block already says verbatim, since a client may pass only content to the model. It carries the same state, measured_at, coverage and freshness (on a success data_truncated and truncated, and on a failure error), key for key. It leaves out data, which is a success's first text block, and the note's sentences, which are the text block just before it (on a failure, the message) and with which notes ends: its notes holds only the sentences the envelope adds about itself, and is left out when there are none. It leaves out method too where that note quotes it verbatim, as cve_exposure's does ("Method: …"). So the text blocks together carry the structured result, but for what a TEXT CUT leaves out of the answer (see "Long answers"), and cannot disagree with it; beside a DATA CUT, the first text block is cut from the answer whole, not from the cut data. Before 2.2.0 this block repeated the whole note, so every note was sent twice.

`state`	What it means
`measured`	A measurement of what was asked. An exposure count is `measured` only when the answer says when what it counts was observed (`measured_at`) and how it was produced (`method`). No exposure answer says when today, so neither exposure tool answers `measured`.
`not_assessed`	The answer holds no dated measurement of what was asked, so no count in it is presented as one: the radar does not look for this CVE, the answer does not say whether it does, or the answer does not say when what it counts was observed. It can still relay a count, as what the source holds on record, undated: `cve_exposure`'s `exposed_hosts` when its `exposure_state` is `exposed`, and `exposure_radar`'s labelled totals. The notes, and `exposure_state` where the result carries it, say what each count is.
`failed`	The lookup did not complete. Not a finding.
`invalid_input`	The input was refused, by this server or by the API, so nothing was looked up. Not a finding.

What each tool's state, measured_at, coverage and freshness hold, tool by tool, is in docs/structured-results.md. Every field comes from what the API sends; where the API does not say, the field is null and a note says so.

A success whose fields do not fit the tool's outputSchema (a field of a type the schema does not allow) is returned as a failure with error.kind unexpected_shape, never relayed, with one exception: a cve_summary poller field of another JSON type is left out of data and named in the note, and the rest of the answer is relayed, summary with it. A field the API adds later is still relayed by every tool that relays the API's JSON as data, and exposure_radar and cve_intel, which relay a selection, leave it out and name what they leave out.

Protocol versions

The server answers both eras of the Model Context Protocol on stdio:

2026-07-28: a client that opens with server/discover receives a DiscoverResult listing 2026-07-28, the tools, prompts and resources capabilities and the server instructions, and then sends each request with the per-request _meta envelope.
2025 and earlier: a client that opens with initialize, as every 1.x SDK client does, negotiates 2025-11-25, 2025-06-18, 2025-03-26 or 2024-11-05; a version the server does not know is answered with 2025-11-25.

The first message of a connection picks its era. The DiscoverResult lists only 2026-07-28, as the SDK builds it: the 2025-era versions are reached through initialize. Both handshakes carry the package's name and version (serverInfo), and every API request carries them in its User-Agent, echelongraph-mcp/<version>.

Both handshakes also carry the server instructions: the data is public; that Shodan data is Shodan's; what state, measured_at and freshness mean, and that each result carries them in its structured result and again in its text; and that exposure numbers are aggregate counts of ip:port services, not an internet-wide census.

The instructions and every tool description are at most 2,048 characters, the length at which Claude Code cuts each of them before the model reads it (its CLAUDE_CODE_MAX_MCP_DESCRIPTION_LENGTH, default 2048), so no client that cuts there loses a sentence. A description says what its tool returns and the rules that keep a zero, a false or a failure from reading as a finding; what each field counts, in full, is in the tool's outputSchema, and the result's note says it again for the numbers it relays.

Privacy: what is sent where

The npm package (stdio). The server runs on your machine and sends HTTPS requests to one host, ECHELONGRAPH_API_BASE (default https://app.echelongraph.io), one per API call a tool makes (exposure_radar makes five; every other tool makes one). No telemetry: it sends nothing else, to EchelonGraph or anyone. Every request carries the User-Agent echelongraph-mcp/<version> (+https://echelongraph.io/pulse/mcp), with the ECHELONGRAPH_MCP_UA token ahead of it when you set one, so the API's access log can count use per version. Like any HTTPS request, it also reaches the API from your network address.

Where each tool's input travels:

Input	Where it is sent
A CVE ID (`get_cve`, `cve_exposure`, `epss_history`, `cve_intel`, `cve_remediation`, `vendor_advisories_for_cve`), a CWE ID and page (`get_cwe`), a vendor and advisory ID (`get_vendor_advisory`)	The URL path.
`search_cves`: `search`	The `X-EG-Search` request header, never the URL. Its severity, minimum CVSS, sort, limit and offset go in the query string.
`search_vendor_advisories`: `query`	The `X-EG-Advisory-Search` request header, never the URL. Its vendor, severity, CVE filter, limit and offset go in the query string.
`check_affected`: `product`, `version`, `ecosystem`, `package`	The `X-EG-Product`, `X-EG-Version`, `X-EG-Ecosystem` and `X-EG-Package` request headers, never the URL.
`cve_remediation`: `ecosystem`, `package`, `version`	The `X-EG-Ecosystem`, `X-EG-Package` and `X-EG-Version` request headers, never the URL. The CVE ID goes in the URL path.
`kev_recent`: `since`, `until`, `ransomware`, `vendor`, `limit`, `cursor`	The `X-EG-Since`, `X-EG-Until`, `X-EG-Ransomware`, `X-EG-Vendor`, `X-EG-Limit` and `X-EG-Cursor` request headers, never the URL.
`check_sbom`: `purls`, or an `sbom` document	The purls, in POST bodies of at most 200 each. A CycloneDX or SPDX document is read on your machine and only the purls in it are sent; the document is not. (Over the hosted endpoint the document goes to EchelonGraph's server instead: see below.)
`scan_manifest`: `files`	The purls read from the files, in POST bodies of at most 200 each; the filenames, the files' text and the entries not checked are not sent on to the API. Run from npm, the server that reads them is on your machine; over the hosted endpoint it is EchelonGraph's, and the files are the request body (see below).

The API marks its answers to header-carried lookups no-store, so no shared cache keeps them, and request logs and trace spans that record URLs do not hold what was looked up there.

The hosted endpoint. A request to https://mcp.echelongraph.io/mcp reaches EchelonGraph's server first, which then calls the same API as above. Per request it logs the HTTP method and path, the status, the duration, the body size, the JSON-RPC method and (for tools/call) the tool name, the protocol version, whether an Origin header was sent, and the family of your client's User-Agent. It never logs tool arguments or a query string. A check_sbom document (or an sbom_review prompt's) is a tool argument like any other here: it is in the request body, so the whole document reaches EchelonGraph's server, which reads the purls from it in memory, sends only those to the API, and neither logs nor keeps the document. To keep the document on your machine, run the npm package, or pass check_sbom the purls. scan_manifest's files are the same: their whole text is in the request body, which EchelonGraph's server reads into purls in memory, sending only those to the API, and neither logs nor keeps the files. To keep lockfiles on your machine, run the npm package. When a client passes the per-client limit it logs that client's address key. It passes your client's public address to the API, in a header the API trusts only with a token it checks, so the API's rate limit counts you and not the hosted service. The API's access line then records each of those calls under your address (an IPv6 address by its /64) with its URL path: for a CVE, CWE or advisory lookup, the ID you asked about. It does not record the query string or the header-carried terms above (for search_cves, whether a term was given and its length, not the term), and of check_sbom's and scan_manifest's purls it records how many, not which.

EchelonGraph's privacy policy: https://echelongraph.io/privacy.

Rate limits

No API key, so the API limits each caller, one IPv4 address or one IPv6 /64 network, counting all its requests together in a 60-second window: 12,000 a minute to /api/v1/public/cves and the paths under it, 6,000 to the CWE, vendor-advisory, KEV and shadow-AI paths, and 600 to any other public path; check_sbom's and scan_manifest's batch route is charged per component, 1,200 components a minute. Over a limit the tool returns a failure (state failed, error.status 429), never empty data; check_sbom and scan_manifest wait out a 429's Retry-After within 50 seconds a call, and answer what they have, the rest counted in coverage.not_sent. The hosted endpoint adds 120 MCP requests a minute per client address, and refuses a request body over 64 KiB (6 MiB for a check_sbom or scan_manifest call, or an sbom_review prompt). Every limit, path by path, with what a tool answers past each: docs/rate-limits.md. The API's own documentation of these limits: https://echelongraph.io/pulse/api.

Configuration

The npm package (stdio):

Env var	Default	Purpose
`ECHELONGRAPH_API_BASE`	`https://app.echelongraph.io`	Override the API base (self-host / proxy). A credential in the URL is masked wherever a result quotes the base.
`ECHELONGRAPH_API_TIMEOUT_MS`	`15000`	Per-request timeout. A slower answer is reported as a failed lookup, not as empty data.
`ECHELONGRAPH_MCP_UA`	unset	One product token (for example `my-monitor/1.0`) put ahead of this package's own User-Agent, so automated callers such as monitors are told apart from people using the server. A value that is not a single token is ignored.

The HTTP entrypoint, dist/http.js (npm run start:http), serves the same tools over Streamable HTTP on POST /mcp, with a liveness check on GET /health. In a container with little memory, start it with V8's heap capped below the container's limit, as EchelonGraph's hosted deployment does in 256 MiB (node --max-old-space-size=104 --max-semi-space-size=16 dist/http.js): Node otherwise sizes its heap from the memory the system reports, which in a container can be the host's, and the container is then killed before V8 collects. It reads the three variables above and:

Env var	Default	Purpose
`PORT`	`8080`	The port it listens on.
`MCP_RATE_LIMIT_PER_MIN`	`120`	MCP requests a minute per client address, per instance.
`MCP_MAX_BODY_BYTES`	`65536`	The largest request body it reads, except for an SBOM (below).
`MCP_MAX_SBOM_BODY_BYTES`	`6291456`	The largest body of a `tools/call` of `check_sbom` or `scan_manifest`, or a `prompts/get` of `sbom_review`.
`MCP_LARGE_BODY_SLOTS`	`2`	How many bodies over `MCP_MAX_BODY_BYTES` it reads and serves at once; past that, 503 with `Retry-After`.
`MCP_MAX_IN_FLIGHT`	`64`	How many requests it serves at once, not counting `subscriptions/listen` streams; the next, its body read, waits.
`MCP_ADMISSION_WAIT_MS`	`10000`	How long a request waits to be served before it is answered 503 with `Retry-After`.
`MCP_H2C`	unset	`1`: serve HTTP/2 cleartext (h2c, prior knowledge) instead of HTTP/1.1, as Cloud Run's `--use-http2` requires; an HTTP/1.1 request then gets no answer. Over h2c, a stream the client resets stops its call.
`ECHELONGRAPH_FORWARD_TOKEN`, `ECHELONGRAPH_FORWARD_HOST`, `MCP_REQUIRE_FORWARD_TOKEN`	unset	EchelonGraph's hosted deployment only: the token with which it names each client to the API. Leave them unset when you run it yourself; the API then counts every request as coming from your server.

Develop

npm install
npm run build      # tsc → dist/
npm test           # build, then the behavioural suite over both protocol eras, against a stub API (no network needed)
npm run smoke      # spawn the server + call cve_exposure against the production API

npm run smoke calls the production API with this package's User-Agent. Run from our own workspace, whose egress address the API recognises as ours, its requests are counted as our own traffic and appear in no adoption count. Run from any other machine, they are counted as external MCP adoption unless you set ECHELONGRAPH_MCP_UA (for example ECHELONGRAPH_MCP_UA=my-smoke/1.0 npm run smoke), which files them under that token's family instead. npm test never leaves the machine.

npm test runs the suite once over a 2026-07-28 server/discover and once over a 2025-06-18 initialize, plus the era tests. To run it against an installed package rather than dist/, set ECHELONGRAPH_MCP_BIN to that package's echelongraph-mcp bin: the tests then run the bin directly, as npx does, and read that package's own files.

Versioning

Semantic versioning: a major version changes protocol behaviour or drops a Node.js version, a minor version adds tools or fields, a patch fixes wording or behaviour without changing a tool's shape. Every release is published to npm with a provenance attestation by the public repo's release workflow, from the commit tagged v<version>. Changes per version: CHANGELOG.md.

Since 3.0.2 a success's outputSchema admits top-level fields it does not name, so a field added in a minor release does not fail a client still holding the tool list it read before. A client that shows "does not match the tool's output schema" after an upgrade is validating against the schema of the version it listed: reconnect it (Claude Code: /mcp, then reconnect echelongraph) or restart it. Each tool's data schema stays closed: a field added inside it needs that reconnect too.

Security

Report a vulnerability privately to [email protected], not in a public issue. The policy, the supported versions and the scope are in SECURITY.md.

License

The code is MIT-licensed.

The CVE Pulse compilation (how EchelonGraph combines its CVE sources, and the EchelonGraph score) is © EchelonGraph, served under the CVE Pulse free-access terms; the source records it compiles stay under their publishers' terms.

Exposure counts are derived from Shodan data. Shodan data is owned by Shodan, which holds its copyright (© Shodan). EchelonGraph claims no ownership of it or copyright in it.

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