workers-oauth-provider is a library that adds OAuth 2.1 authorization to HTTP APIs and remote MCP servers running on Cloudflare Workers. It is for protecting Worker routes, validating bearer tokens, and supporting authorization discovery for MCP clients. The catalogue entry is an instruction for using this library.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add cloudflare/workers-oauth-provider --skill migrate-to-1.xgit clone --depth 1 https://github.com/cloudflare/workers-oauth-providerWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/cloudflare/workers-oauth-provider/migrate-to-1.x)<a href="https://agentmods.dev/skills/cloudflare/workers-oauth-provider/migrate-to-1.x"><img src="https://agentmods.dev/badge/skills/cloudflare/workers-oauth-provider/migrate-to-1.x/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/cloudflare/workers-oauth-provider/migrate-to-1.x"><img src="https://agentmods.dev/badge/skills/cloudflare/workers-oauth-provider/migrate-to-1.x.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00070 | $0.01717 |
| Opus 5.5 | $0.00028 | $0.00687 |
| Sonnet 5.5 | $0.00014 | $0.00343 |
| Haiku 4.5 | $0.00007 | $0.00172 |
Grade A, and why
workers-oauth-provider-migrate-1.x scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Before changing code, get the value from the live 0.x deployment: `curl -si <api route>` for the `resource_metadata` URL, then `curl <that URL> | jq -r .resource`. If you have access, sample grants with `wrangler kv ke How it starts
The opening of the file, as written. The whole thing — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Upgrade @cloudflare/workers-oauth-provider to the latest 1.x
Reference (read the section for every hit): node_modules/@cloudflare/workers-oauth-provider/docs/migration-1.x.md.
Types and JSDoc: node_modules/@cloudflare/workers-oauth-provider/dist/oauth-provider.d.ts.
No KV migration exists or is needed; never edit stored data. Existing sessions survive only if the configured resource equals the resource stored on existing grants. A mismatch signs every user out at deploy; see "Existing grants decide the resource" below.
Procedure
- Note the installed version (
package.json). Skip guide sections tagged older than it. - Search the project for each pattern below and apply the fix.
- Bump to the latest
^1, install, typecheck, run tests. Construction errors quote the rule; grep the guide for the message. - Keep
OAuthProviderif the project uses it. Don't move toOAuthAuthorizationServer/OAuthResourceServerunless asked.
| Pattern in the project | Fix | Guide section |
|---|---|---|
new OAuthProvider( without resourceMetadata |
add resourceMetadata: { resource } set to the value existing grants carry (see below) |
The canonical resource is required |
resourceMatchOriginOnly |
delete; do not substitute the origin as resource (see below) |
Removed: resourceMatchOriginOnly |
resolveExternalToken |
return audience: <resource> |
resolveExternalToken names its audience |
scopes_supported inside resourceMetadata |
move to top-level requiredScopes |
requiredScopes replaces resourceMetadata.scopes_supported |
allowImplicitFlow, allowPlainPKCE |
delete; own clients must use code + S256 | Removed: the implicit grant and plain PKCE |
redirectUris / redirect URIs with http:// non-loopback or a custom scheme |
https or loopback; native apps: allowPrivateUseRedirectUris: true |
Redirect URIs must be HTTPS or loopback HTTP |
clientRegistrationTTL: 0; any *TTL below 60 |
0 → undefined; raise to ≥ 60 |
Lifetimes are validated at construction |
userId: built with : (e.g. `${a}:${b}`) |
encodeURIComponent(...), same value in listUserGrants/revokeGrant |
User IDs cannot contain : |
revokeExistingGrantsBatchSize |
delete | Removed: revokeExistingGrantsBatchSize |
imports of resourceMatches, validateResourceUri, isValidOAuthScopeToken, base64UrlToBytes, parseJwtJsonPart, getJwtCryptoAlgorithms |
inline the logic; no replacement export | Internal helpers are no longer exported |
createClient( / updateClient( |
only authorization_code/refresh_token/enabled grants, code responses; don't update CIMD clients |
Client helpers validate what they store |
tokenExchangeCallback |
OAuthError('invalid_grant') now revokes the grant; env is available; check returned TTLs |
tokenExchangeCallback |
purgeExpiredData( |
persist result.cursor, pass it back as cursor |
purgeExpiredData() resumes from a cursor |
new OAuthAuthorizationServer( |
drop authorizeEndpoint/tokenEndpoint if they equal ${issuer}/authorize, ${issuer}/oauth/token |
OAuthAuthorizationServer endpoints have defaults |
ExchangeTokenOptions.aud, AuthRequest.resource as arrays |
single strings | Type changes |
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 10d ago First seen · 63 lines · 70 tokens per session scan A cd1b8be50b35
workers-oauth-provider-migrate-1.x is a skill published in the GitHub repository cloudflare/workers-oauth-provider (1,883 stars, last pushed 9d ago), licensed MIT. It adds 70 tokens to every session and 1,717 once invoked, about $0.0003 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-06.
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