Every Signal MCP server

Every Signal is a marketing intelligence API that audits AI-written marketing against real teardowns and measured conversion rates.

Your agent sends a landing page, an email, an ad, a funnel or a domain. Every Signal compares it with teardowns of real companies (their copy, funnels, prices, ads, tracking) and measured conversion rates, and returns a score, findings that name the knowledge-base record behind each claim, concrete fixes and a rewrite. Every figure carries a tag: verified, estimate, inferred or rumour.

• Remote MCP server: https://everysignal.com/mcp (Streamable HTTP, Authorization: Bearer <API key>), or https://everysignal.com/mcp/connect with OAuth sign-in

• REST API: https://everysignal.com/api/v1 (OpenAPI, prices)

• Official MCP registry: com.everysignal/everysignal

• Docs for people: https://everysignal.com/connect/ · for LLMs: https://everysignal.com/llms.txt

Get a key

Sign in at https://everysignal.com/app/keys and create a key. The first key on a verified email comes with 50 free credits ($5), enough for an audit. Credits are prepaid (1 credit = $0.10), never expire, and failed jobs are refunded.

Related MCP server: Website Auditor MCP

Connect

Claude.ai, Claude Desktop and ChatGPT (developer mode): add a custom connector with the URL https://everysignal.com/mcp/connect. You sign in to Every Signal by email (OAuth, PKCE); no key to paste.

Claude Code

claude mcp add --transport http everysignal https://everysignal.com/mcp --header "Authorization: Bearer YOUR_KEY"

Cursor (~/.cursor/mcp.json) and other clients that take a URL

{"mcpServers": {"everysignal": {"url": "https://everysignal.com/mcp", "headers": {"Authorization": "Bearer YOUR_KEY"}}}}

Windsurf (~/.codeium/windsurf/mcp_config.json)

{"mcpServers": {"everysignal": {"serverUrl": "https://everysignal.com/mcp", "headers": {"Authorization": "Bearer YOUR_KEY"}}}}

Claude Desktop (claude_desktop_config.json, via mcp-remote)

{"mcpServers": {"everysignal": {"command": "npx", "args": ["-y", "mcp-remote", "https://everysignal.com/mcp", "--header", "Authorization: Bearer YOUR_KEY"]}}}

ChatGPT: create a custom GPT, add an Action, import https://everysignal.com/api/v1/openapi.json, Authentication = API key, Bearer.

Install in one step

• Claude Code plugin (MCP server + skill): /plugin marketplace add schoettle-cmd/everysignal-mcp, then /plugin install everysignal@everysignal, and set EVERYSIGNAL_API_KEY.

• Gemini CLI: gemini extensions install https://github.com/schoettle-cmd/everysignal-mcp, and set EVERYSIGNAL_API_KEY.

• Cursor: Add to Cursor (then replace YOUR_KEY in ~/.cursor/mcp.json).

• Cline and other agents: llms-install.md.

Tools

Long jobs return a job id; poll job_status (or GET /api/v1/jobs/<id>). Webhooks are signed (Every-Signal-Signature: t=<time>,v1=HMAC-SHA256(secret, "<t>.<body>")).

Example

See examples/audit.sh. A sample result for an invented landing page ("DreamWell, an AI sleep coach"): verdict revise, score 35; top finding (high, verified, record calm): "The free trial has no terms: no length, no card requirement, no renewal price."

Claude skill

skill/SKILL.md tells an agent when to call which tool and how to use the result.

Rules

Public URLs only (https, ports 80/443); we fetch with EverySignalBot. No personal data or secrets in inputs. 60 calls a minute per key, 5 running jobs. Acceptable use · Terms · Privacy · hello@everysignal.com

Operated by mjonesone LLC.