Overwing by overwing.ai
MCP server · Guardrails & safety filters · indexed, not reviewed
HostedLocalvendor's own
Not reviewed
No score, grade or rank. This listing is facts from the official MCP registry and our own checks, and it stays out of the rankings until the panel reviews it.
Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm.
Facts
- MCP registry
ai.overwing/mcp· 0.12.0- Endpoint
https://overwing.ai/mcp- Packages
npmoverwing-mcp stdio- Website
- overwing.ai
- npm / week
- 948
- GitHub stars
- 0
- Registry entry
- updated 2 Oct 2026
From the official MCP registry, the package registries and our own checks. JSON · Markdown
Why it's listed
- It's published in the registry under overwing.ai, a namespace the registry only gives to whoever proves they control that domain.
Being indexed says nothing about quality, and nobody can pay for it. Is this yours? Ask for a review.
Tools it lists 34 · about 6,650 tokens of context · checked 1 hour ago
| Tool | What it does | Hint |
|---|---|---|
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… | writes |
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. | writes |
list_rule_setsList rule sets | List the prebuilt and custom rule sets available to this organization. Needs an organization key. | read-only |
get_rule_setGet 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. | read-only |
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… | writes |
get_evaluationGet evaluation | Fetch a stored evaluation by id, including the original input and per-rule results. Needs an organization key. | read-only |
list_evaluationsList evaluations | List recent evaluations, newest first, with optional verdict and rule set filters. Use next_cursor to page. Needs an organization key. | read-only |
get_usageGet usage | Daily usage, remaining quota for today, and plan limits. Needs an organization key. | read-only |
whoamiWho am I | 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. | read-only |
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… | writes |
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.… | writes |
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… | writes |
list_plansList plans | Public plan catalog: prices, daily limits, and per-minute burst limits. No API key needed. | read-only |
atlas_lookupIdentify a user agent (Overwing Atlas) | 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,… | read-only |
atlas_agentsSearch the agent registry (Overwing Atlas) | 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,… | read-only |
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… | writes |
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… | writes |
atlas_list_registrationsList your registered agents (Overwing Atlas) | 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.… | read-only |
atlas_withdraw_registrationWithdraw a registration (Overwing Atlas) | 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. | writes |
atlas_summaryAgent traffic and spending summary (Overwing Atlas) | 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… | read-only |
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,… | writes |
beacon_reportRead a reachability report (Overwing Beacon) | 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… | read-only |
beacon_sampleSample reachability report (Overwing Beacon) | 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. | read-only |
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.… | writes |
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… | writes |
tower_list_agentsList agents (Overwing Tower) | List this organization's Tower agents with scopes, status and last use. Keys are never returned. Needs an organization key. | read-only |
tower_revoke_agentRevoke an agent (Overwing Tower) | Revoke an agent. Its key stops working at once and cannot be restored. Needs an organization key. | writes |
tower_capabilitiesWhat may I do? (Overwing Tower) | 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. | read-only |
tower_decideWould this be allowed? (Overwing Tower) | 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.… | read-only |
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… | writes |
tower_get_actionGet an action (Overwing Tower) | 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. | read-only |
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. | writes |
tower_get_receiptGet a receipt (Overwing Tower) | 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. | read-only |
tower_verify_receiptsVerify the receipt chain (Overwing Tower) | 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. | read-only |
What https://overwing.ai/mcp answered to tools/list, asked without credentials over MCP 2026-07-28. The token figure is the size of the list as sent, divided by four; a model sees about that much before it calls anything. Full definitions, input schemas included, are in the listing's JSON under mcpTools.
How its tools read to an agent 0 errors · 12 warnings · 1 note
- warnTC11atlas_agents2 parameters without a description: limit, operator
- warnTC11atlas_register_agent3 parameters without a description: description, follows_robots_txt, purpose
- warnTC11create_rule_setnone of its 4 parameters has a description
- warnTC11evaluate_batchnone of its 4 parameters has a description
- warnTC11get_evaluationits one parameter, id, has no description
- warnTC11get_rule_setits one parameter, slug, has no description
- warnTC11get_usageits one parameter, days, has no description
- warnTC11list_evaluationsnone of its 4 parameters has a description
- warnTC11list_rule_setsits one parameter, include_inactive, has no description
- warnTC11tower_decide1 parameter without a description: operation
- warnTC11tower_submit_action2 parameters without a description: dry_run, operation
- warnTC11tower_verify_receiptsnone of its 2 parameters has a description
- noteTC24server34 of 34 tools have no outputSchema
The checks from /check and anchor check, run each day on the list above: about 6,650 tokens of definitions. Not part of the score yet. Check your own server.