Overwing

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

• Connection: Computer or cloud
• Transport: stdio, Streamable HTTP
• Category: Search & AI memory
• You need to fill in: OVERWING_API_KEY, OVERWING_AGENT_KEY, Authorization

Install

Pick the AI app you use, then copy the settings.

You need

• Runs in the cloudNothing to install; it connects over the internet
• npmNode.js installed (for the npx command)

Which app do you use?

{
  "mcpServers": {
    "overwing": {
      "command": "npx",
      "args": [
        "-y",
        "overwing-mcp"
      ],
      "env": {
        "OVERWING_API_KEY": "your-value",
        "OVERWING_AGENT_KEY": "your-value",
        "OVERWING_BASE_URL": "your-value"
      }
    }
  }
}

claude mcp add --transport http overwing https://overwing.ai/mcp --header 'Authorization: your-value'

claude mcp add overwing --env OVERWING_API_KEY=your-value --env OVERWING_AGENT_KEY=your-value --env OVERWING_BASE_URL=your-value -- npx -y overwing-mcp

{
  "mcpServers": {
    "overwing": {
      "url": "https://overwing.ai/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

{
  "mcpServers": {
    "overwing": {
      "command": "npx",
      "args": [
        "-y",
        "overwing-mcp"
      ],
      "env": {
        "OVERWING_API_KEY": "your-value",
        "OVERWING_AGENT_KEY": "your-value",
        "OVERWING_BASE_URL": "your-value"
      }
    }
  }
}

{
  "servers": {
    "overwing": {
      "type": "http",
      "url": "https://overwing.ai/mcp",
      "headers": {
        "Authorization": "your-value"
      }
    }
  }
}

{
  "servers": {
    "overwing": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "overwing-mcp"
      ],
      "env": {
        "OVERWING_API_KEY": "your-value",
        "OVERWING_AGENT_KEY": "your-value",
        "OVERWING_BASE_URL": "your-value"
      }
    }
  }
}

Your choice stays on this device in a cookie; no account needed.

Values you fill in

• OVERWING_API_KEY secret env
  Overwing organization key (ow_live_...). Optional: evaluate and atlas_lookup work without it, 10 a day each. Needed for higher limits, rule sets and Tower setup. Get one at https://overwing.ai/login…
• OVERWING_AGENT_KEY secret env
  Optional Overwing Tower agent key (ow_agent_...). Without it, the tower_create_agent tool mints one for the session
• OVERWING_BASE_URL env
  Override the API base URL for self-hosted deployments (default https://overwing.ai)
• Authorization secret HTTP header
  Optional. "Bearer ow_live_..." lifts the free limits; evaluate and atlas_lookup work without it, 10 a day each

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 8, 2026. The maker wrote them, not us; we show them as plain text.

• evaluate

  Works with no API key: 10 evaluations a day, inputs up to 2,000 characters, and the text is not stored. With a key: 250 a day and up, inputs up to 100,000 characters, and your own rule sets. Score any text (typically an LLM's output) against an Overwing rule set. The text can be

• evaluate_batch

  Score up to 50 texts against one rule set in a single call. Each item counts as one evaluation. Returns a summary plus per-item verdicts; items can fail independently. Needs an organization key.

• list_rule_sets

  List the prebuilt and custom rule sets available to this organization. Needs an organization key.

• get_rule_set

  Fetch a rule set with its full rule definitions. Use 'content-safety' as a worked example when writing your own. Needs an organization key.

• create_rule_set

  Create a custom rule set with 1 to 25 rules. Each rule is a choice (pick one option), score (position on an ordered scale), or noul (yes/no) question with a fail condition, optional review threshold, weight, and action (block, redact, or review) that callers should take when it f

• get_evaluation

  Fetch a stored evaluation by id, including the original input and per-rule results. Needs an organization key.

• list_evaluations

  List recent evaluations, newest first, with optional verdict and rule set filters. Use next_cursor to page. Needs an organization key.

• get_usage

  Daily usage, remaining quota for today, and plan limits. Needs an organization key.

• whoami

  Identify the organization and plan behind the API key on this request, the key's scope, the organization's data settings (store_inputs, retention_days), and whether billing is set up. Needs an organization key.

• create_account

  Create an Overwing account for yourself, with no email: an organization and an API key, returned once. Nothing is sent to anyone. Use it when you have no key and nobody has given you one; do not create a second account if you already have a key (whoami says which account a key be

• prove_domain

  Begin proving that your account controls a domain. For an account with no email the domain stands in for one: it raises the limits to the normal free tier, opens full Beacon reports, and lets a lost key be replaced. Returns one value to publish at the domain, as a DNS TXT record

• verify_domain

  Look for the value prove_domain asked for, at the domain. Found: the domain is the account's. Not found: an error saying what was looked for; DNS changes can take a few minutes, and calling again is safe. Needs an organization key.

• list_plans

  Public plan catalog: prices, daily limits, and per-minute burst limits. No API key needed.

• atlas_lookup

  Say what a User-Agent string claims to be and whether the claim can be trusted, from the Overwing Atlas registry of AI crawlers, fetchers and browser agents. Returns the claimed agent, operator, purpose class, verification method (Web Bot Auth signature, user-agent string only, o

• atlas_agents

  Browse or search Overwing Atlas, the registry of AI crawlers, fetchers and browser agents: name, operator, user-agent tokens, Web Bot Auth key directory, robots.txt behaviour, and (with Atlas Pro or Team) purpose class, verification, evasion flags and traffic shares. Filter by fr

• atlas_register_agent

  Add an agent or crawler you operate to the Overwing Atlas registry, free, so a site that looks up its User-Agent learns who runs it. Give the agent's name, the operator (the company or person running it), the operator's domain, and the token the User-Agent carries (the product na

• atlas_verify_registration

  Look for the proof at the operator's domain: the DNS TXT record or the file that atlas_register_agent asked for. Found: the entry is published in the registry, or held for a person when the operator name already belongs to someone. Not found: an error saying what was looked for;

• atlas_list_registrations

  The agents this organization has registered in Overwing Atlas, newest first, each with its status (pending_verification, pending_review, published, rejected) and, while unverified, the value to publish at the domain. Needs an organization key.

• atlas_withdraw_registration

  Withdraw a registration. A published entry leaves the registry, so lookups stop naming the agent; an unfinished request is abandoned. This cannot be undone: register again to put it back. Needs an organization key.

• atlas_summary

  Public numbers from Overwing Atlas: registry counts by purpose and verification, published browser-agent traffic shares, sector field-scan headlines (e.g. how many OSINT sites carry AI-crawler rules or any agent-payable surface), and the summary of the Agent Consumers report on w

• beacon_start

  Overwing Beacon answers one question about a site: is this product reachable by agents? It checks robots.txt rules for AI agents, llms.txt, the sitemap, the MCP server card, hosted MCP endpoint and MCP Registry listing, the A2A agent card, OpenAPI discovery, and how the home page

• beacon_report

  The report for a check started with beacon_start. The first call runs the check. With an Overwing key on the connection: score (0 to 100), verdict (yes, partly, no), the find / read / use answers, every check with what was found and a fix when it did not pass, and top_fixes ranke

• feedback

  Send one message to the people who run Overwing: a verdict you think was wrong, an error you could not act on, a payment you could not make, a tool that did not do what its description says. Read by a person, not answered automatically; give a contact if you want an answer. No ke

• beacon_sample

  A real Overwing Beacon report, free: the check of overwing.ai itself, refreshed daily. Read it to see exactly what a full report holds before starting a check. No key needed.

• preflight_payment

  Call this with the 402 you were given, before signing an x402 payment. It reads the terms (network, asset, amount, payee, timeout, resource) and answers allow, review or refuse with reasons: the terms against your policy, the payee against x402-list's directory (verified delivery

• preflight_check

  Call this before signing any Solana transaction. Overwing Preflight simulates the unsigned transaction against the chain as it is now, works out what it would take from the wallet you name (SOL, tokens, and control of its token accounts) and answers allow or refuse against your p

• preflight_verdict

  The public record of one Preflight verdict: its decision, reason codes, the programs the transaction would run, the transaction's digest, our signature, and every landed transaction reported against it. Never the wallet, the amounts or the transaction. No key needed.

• preflight_report

  After a transaction that Preflight allowed has landed, report its signature. Preflight reads the landed transaction from the chain and says whether the allow held: not_a_miss, or miss when it took more from the wallet than the policy permitted. The outcome is published. A covered

• preflight_record

  Everything Preflight has said and how it held up: counts of verdicts and misses, every miss with what the chain showed, the latest verdicts, and what the guarantee's reserve holds. Read it before deciding whether to rely on Preflight. No key needed.

• preflight_overview

  The reference for Overwing Preflight: every policy field, every reason code a refusal can carry, what a verdict does and does not promise, the price, and the terms of the guarantee. Read it once before the first preflight_check. No key needed.

• tower_load_template

  Set up Overwing Tower for this organization by loading the starter workflow: email purchase order to order entry, with create_order, update_order and cancel_order against a mock IBM i system, and a starter policy. Idempotent. Needs an organization key. Returns a sample input you

• tower_create_agent

  Create a scoped agent identity and its key. Needs an organization key. Scope it to the operations the agent needs (for example create_order) rather than * where you can. The key (ow_agent_...) is returned once, in this result, and this server does not keep it: store it, and send

• tower_list_agents

  List this organization's Tower agents with scopes, status and last use. Keys are never returned. Needs an organization key.

• tower_revoke_agent

  Revoke an agent. Its key stops working at once and cannot be restored. Needs an organization key.

• tower_capabilities

  List the operations this agent is allowed to call, each with the JSON Schema its input must match and its compensating operation. Call this first; build inputs from the schema rather than guessing. Needs an agent key.

• tower_decide

  Ask Tower how it would rule on an operation without doing anything: auto (would execute), review (a person must approve), or reject. Returns the score, the reason, and each policy question's answer. No side effects. Needs an agent key.

• tower_submit_action

  Ask Tower to perform an operation on the legacy system. Tower decides: executed (done), pending (a person must approve; poll tower_get_action, do not resubmit), or rejected (do not retry unchanged). Always send an idempotency_key that is stable for this business request, such as

• tower_get_action

  Status and result of an action: pending, approved, executed, failed, compensated, or rejected. Use it to poll an action that is waiting on human review. Needs an agent key.

• tower_compensate

  Run the compensating operation for an executed action, for example cancel the order that create_order made. Runs once; repeating it returns the first outcome. Needs an agent key.

• tower_get_receipt

  Fetch one signed receipt by id or by sequence number: the payload, its hash, the previous link's hash, and the Ed25519 signature. Needs an agent key.

• tower_verify_receipts

  Recompute every hash and check every signature over a range of this organization's receipts. Reports the first break, if any. Defaults to the whole chain (up to 5,000 links per call). Needs an agent key.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 10, 2026

• ✓ Pass

  Maker matches the repo

  The registry name was verified against the domain overwing.ai (the registry checks domain ownership)

• … Not checked yet

  Still maintained

  We have not read this repo from GitHub yet

• … Not checked yet

  Has a licence

  We have not read this repo from GitHub yet

• ✓ Pass

  Endpoint responds

  Responded in 262 ms (HTTP 200)

• – Not applicable

  Sign-in with OAuth

  No sign-in needed

• ✓ Pass

  No hidden instructions in tool descriptions

  Read 41 tool descriptions and found no hidden instructions to the AI

Compared with others in Search & AI memoryi

• More stars than 0% of the other 5862 servers in this category
• Published to the registry more recently than 58% of the other 5862 servers in this category
• Basic checks equal to or better than 100% of the other 5862 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

README from the maker

claude mcp add --transport http overwing https://overwing.ai/mcp

curl -X POST https://overwing.ai/api/v1/signup

claude mcp add overwing -e OVERWING_API_KEY=ow_live_... -- npx -y overwing-mcp

{

curl -X POST https://overwing.ai/api/v1/api-keys \

Verdict: FAIL  score=0.82  confidence=0.97  251ms