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Overwing

Guardrails for LLM output: pass / fail / review verdicts and one recommended action.

Connector by overwing.aiOfficial · Domain verified by the MCP Registry

IndexedMITLocal (stdio)Remote (HTTP)
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Install

Works with Claude Code, VS Code, Codex, Cursor, Windsurf, Claude Desktop. Read the repository before you give any tool access to your data.

npx agentmarket install connector/overwing-ai-mcp

Asks which of your tools to add it to (Claude Code, Codex, Cursor, VS Code, Windsurf, Gemini CLI, Claude Desktop) and shows the change first. See https://agentmart.dev/cli.

Remote endpoint

  • https://overwing.ai/mcp Remote (HTTP)

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About

Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm.

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Permissions

What this server can do and what it asks for, from its tool list and install config. Checked Oct 25, 2026.

Tools
23 read · 15 write · 3 delete
Secrets
3 (API keys, tokens or passwords)
Install scripts
None found
Runs as
Node.js package

Tools by what they do 41

From the running server's own tool list (tools/list) on Oct 25, 2026.

Read 23 · Look things up without changing anything.

  • atlas_agents
  • atlas_list_registrations
  • atlas_lookup
  • atlas_summary
  • beacon_report
  • beacon_sample
  • get_evaluation
  • get_rule_set
  • get_usage
  • list_evaluations
  • list_plans
  • list_rule_sets
Show 11 more tools
  • preflight_overview
  • preflight_payment
  • preflight_record
  • preflight_verdict
  • tower_capabilities
  • tower_decide
  • tower_get_action
  • tower_get_receipt
  • tower_list_agents
  • tower_verify_receipts
  • whoami

Write 15 · Create, change, send or run things.

  • atlas_register_agent
  • atlas_verify_registration
  • beacon_start
  • create_account
  • create_rule_set
  • evaluate
  • evaluate_batch
  • feedback
  • preflight_check
  • preflight_report
  • tower_compensate
  • tower_create_agent
Show 3 more tools
  • tower_load_template
  • tower_submit_action
  • verify_domain

Delete 3 · Delete, drop, revoke or wipe things.

  • atlas_withdraw_registration
  • prove_domain
  • tower_revoke_agent

Secrets and settings it asks for

Secrets: values you paste in that let it act as you.

  • Authorization
  • OVERWING_AGENT_KEY
  • OVERWING_API_KEY

Other settings (environment variables or headers).

  • OVERWING_BASE_URL

Network hosts it talks to 1

  • overwing.ai · found in remote endpoint, install command

Tools (41)

As the server listed them on Oct 25, 2026. Descriptions are the server’s own words; hidden characters are shown as [U+…].

  • atlas_agentsSearch the agent registry (Overwing Atlas)read-only

    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 free text, purpose (training, search, browser, coding), operator, or verification. Needs an organization key.

  • atlas_list_registrationsList your registered agents (Overwing Atlas)read-only

    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_lookupIdentify a user agent (Overwing Atlas)read-only

    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, or unattributable) and a trust note. Works with no API key: 10 lookups a day. With a key, metered per day by Atlas tier: free 100, Pro 10,000, Team 100,000. Use it when deciding whether to serve, block, or pay-gate a request, or to understand who is hitting a site.

  • atlas_register_agentRegister your agent (Overwing Atlas)

    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 name, such as AcmeBot). The answer carries one value to publish at that domain, as a DNS TXT record or as a file under /.well-known, to prove control of it; then call atlas_verify_registration. A token may not match, contain, or sit inside one already in the registry. This proves control of the domain, not that any given…

  • atlas_summaryAgent traffic and spending summary (Overwing Atlas)read-only

    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 what agents actually spend. No key needed.

  • atlas_verify_registrationVerify and publish a registration (Overwing Atlas)

    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; DNS changes can take a few minutes, and calling again is safe. Needs an organization key.

  • atlas_withdraw_registrationWithdraw a registration (Overwing Atlas)can change or delete data

    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.

  • beacon_reportRead a reachability report (Overwing Beacon)read-only

    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 ranked by value. With no key, the summary of the same report: score, verdict, the three answers and the first fix (access=summary). Answers 202 while the check is running (ask again in a few seconds). No key needed for the summary.

  • beacon_sampleSample reachability report (Overwing Beacon)read-only

    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.

  • beacon_startStart a reachability check (Overwing Beacon)

    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 reads to a model, then returns three answers (find, read, use), a score and the fixes worth making. This tool starts a check and returns its id; it is free. Then call beacon_report with the id, which runs the check (about twenty seconds). With an Overwing key on the connection beacon_report returns the full report and…

  • create_accountCreate your own account (no email)

    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 belongs to). The key is the account, so store it at once: with no email there is no reset link. It starts at 50 evaluations a day with Beacon summaries; proving a domain (prove_domain, verify_domain) raises that to the normal free limits and full Beacon reports, and makes a lost key recoverable. This server does not keep…

  • create_rule_setCreate 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 fails. Rule instructions may reference `context.*` fields that callers pass with each evaluation. Needs an organization key.

  • evaluateEvaluate text

    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 in any language; tested in Spanish, Portuguese, French, German, Japanese, Chinese, Korean, Arabic and Hindi. Results come back in English. Returns an aggregate verdict of pass, fail, or review, a recommended_action (block, redact, review, or allow), and per-rule answers with probability, confidence, and the rule's acti…

  • evaluate_batchEvaluate many texts

    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.

  • feedbackTell Overwing what went wrong

    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 key needed.

Show 26 more tools
  • get_evaluationGet evaluationread-only

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

  • get_rule_setGet rule setread-only

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

  • get_usageGet usageread-only

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

  • list_evaluationsList evaluationsread-only

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

  • list_plansList plansread-only

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

  • list_rule_setsList rule setsread-only

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

  • preflight_checkCheck a Solana transaction before signing it (Overwing Preflight)

    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 policy, with every reason. Sign only if decision is "allow". Treat a refusal, an error, or anything else as do not sign. A verdict describes one moment and covers a transaction that lands within about two minutes, so sign and send at once or check again. This tool takes the serialized transaction and a policy; it never …

  • preflight_overviewWhat Preflight checks and how to call it (Overwing Preflight)read-only

    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.

  • preflight_paymentShould I sign this x402 payment? (Overwing Preflight)read-only

    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, recorded settlements, buyers, shared payout addresses) and the server's own /.well-known/x402 manifest, and the price against what is recorded for that endpoint. Not a simulation and not a guarantee. Sign only on allow; on review, ask the person you work for. No key needed for a few checks a day.

  • preflight_recordThe public record (Overwing Preflight)read-only

    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_reportReport the transaction that landed (Overwing Preflight)

    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 miss is paid to the wallet in the verdict, never to whoever reported it. No key needed.

  • preflight_verdictRead a published verdict (Overwing Preflight)read-only

    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.

  • prove_domainProve a domain for your account

    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 or as a file under /.well-known; then call verify_domain. One domain belongs to one account. Calling again for the same domain returns the same value. Needs an organization key.

  • tower_capabilitiesWhat may I do? (Overwing Tower)read-only

    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_compensateUndo an executed action (Overwing Tower)

    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_create_agentCreate an agent identity (Overwing Tower)

    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 it as the Authorization bearer on a connection used for the agent tools (tower_capabilities, tower_decide, tower_submit_action, tower_get_action, tower_compensate, tower_get_receipt, tower_verify_receipts). Revoke with tower_revoke_agent.

  • tower_decideWould this be allowed? (Overwing Tower)read-only

    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_get_actionGet an action (Overwing Tower)read-only

    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_get_receiptGet a receipt (Overwing Tower)read-only

    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_list_agentsList agents (Overwing Tower)read-only

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

  • tower_load_templateLoad the starter workflow (Overwing Tower)

    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 can submit. Next: tower_create_agent.

  • tower_revoke_agentRevoke an agent (Overwing Tower)can change or delete data

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

  • tower_submit_actionRequest an action (Overwing Tower)

    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 the source message id: repeating a key returns the original outcome instead of acting twice. Set dry_run to see the decision without executing. Needs an agent key.

  • tower_verify_receiptsVerify the receipt chain (Overwing Tower)read-only

    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.

  • verify_domainVerify the domain proof

    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.

  • whoamiWho am Iread-only

    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.

Signals

Stars
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Forks
0
Open issues
1
Last commit
Oct 13, 2026 (15 days ago)
Last release
Oct 13, 2026 (15 days ago)

From GitHub (fetched Oct 24, 2026).

Details

Registry name
ai.overwing/mcp
Version
0.15.0
Auth
Bearer token, API key
Packages
npm overwing-mcp
License
MIT
Repository
github.com/frod27/overwing-mcp
Website
overwing.ai
First seen
Oct 24, 2026
Last checked
Oct 24, 2026
Source
Official MCP Registrygithub-graphql
Cite this page

Overwing MCP server. Agent Mart. https://agentmart.dev/connectors/overwing-ai-mcp (last updated 2026-10-24)