Overwing

Name: Overwing
Author: ai.overwing

MCP serverMCP

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

by ai.overwingrepository ↗homepage ↗v0.12.0MIT

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Evidence

Everything here was measured by our prober or read from a registry. Nothing is self-reported.

30-day availability26/26 checks ok

Tools observed via MCP handshake

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 chara
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 indepen
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 fai
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 whe
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 an
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, open
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 ta
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. Re
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
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
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,
atlas_list_registrations — The agents this organization has registered in Overwing Atlas, newest first, each with its status (pending_verification, pending_review, published, rejected) an
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: reg
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 m
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
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,
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.
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 t
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 eve
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 he
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 guaran
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 te
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_ord
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
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
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 reas
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),
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 a
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. N
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

Provenance

Where this record came from

Every source is kept verbatim. Field changes are logged as events.

Official MCP Registryai.overwing/mcp

first seen 15 d ago · fetched 27 h agoopen ↗

npm registryoverwing-mcp

first seen 14 d ago · fetched 6 h agoopen ↗

Field history (12 recent events)

6 h ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-10-09T17:34:48.737Z","latestVersion":"0.13.0","weeklyDownloa
7 d ago · declared · version → "0.12.0"
7 d ago · declared · description → "Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm."
7 d ago · declared · summary → "Guardrails for LLM output: pass / fail / review verdicts and one recommended action. Hosted or npm."
8 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-10-02T03:44:30.117Z","latestVersion":"0.12.0","weeklyDownloa
8 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-10-01T18:44:09.426Z","latestVersion":"0.10.0","weeklyDownloa
9 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-09-30T16:44:02.857Z","latestVersion":"0.9.0","weeklyDownload
9 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-09-30T13:48:00.008Z","latestVersion":"0.7.2","weeklyDownload
10 d ago · declared · version → "0.7.1"
11 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-09-29T03:00:18.219Z","latestVersion":"0.7.1","weeklyDownload
11 d ago · observed · packageFacts → {"name":"overwing-mcp","registry":"npm","publishedAt":"2026-09-28T20:21:54.946Z","latestVersion":"0.6.0","weeklyDownload
12 d ago · declared · version → "0.5.0"

when	check	result	http	latency	detail
3 h ago	mcp initialize	ok	200	158 ms	server overwing 1.0.0 · protocol 2025-06-18 · 39 tools
10 h ago	mcp initialize	ok	200	147 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
17 h ago	mcp initialize	ok	200	160 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
23 h ago	mcp initialize	ok	200	143 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
30 h ago	mcp initialize	ok	200	168 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
2 d ago	mcp initialize	ok	200	144 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
2 d ago	mcp initialize	ok	200	233 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
2 d ago	mcp initialize	ok	200	191 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
2 d ago	mcp initialize	ok	200	162 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools
3 d ago	mcp initialize	ok	200	232 ms	server overwing 1.0.0 · protocol 2025-06-18 · 34 tools

Overwing

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