Decodes a JWT without trusting it and lints the header and claims: alg none, remote jku/x5u keys, missing or expired exp, nbf/iat clock skew, millisecond timestamps, long lifetimes, iss/aud mismatches, sensitive data in the payload, and HMAC signature checks with a secret from an env var. Use when a login or API call fails with 401, or when reviewing token settings. Includes a stdlib Python inspector with --self-test.
Reviews a password policy config against NIST SP 800-63B-4, covering length minimums, no composition rules or forced expiry, blocklist checks, rate limiting, paste and Unicode support, no hints or security questions, and safe hashing parameters. Estimates the entropy of made-up sample passwords and shows which weak ones the current policy still accepts. Never asks for real passwords. Includes a stdlib Python checker with --self-test.
Checks retry, backoff and timeout settings across a call chain to prevent retry storms. Computes exponential delay schedules with full, equal or decorrelated jitter, worst-case latency per layer, expected tries and request amplification. Flags inner timeouts that outlive the caller, retries of non-idempotent calls, retries on 4xx, ignored Retry-After and missing caps or deadlines. Includes a stdlib Python calculator with --self-test.
Compares an OpenAPI YAML/JSON spec to a list of implemented routes and flags drift: missing operations, extra routes, method mismatches, and path-parameter shape differences. Use when reviewing API PRs, before a release, or asking "does our code still match the OpenAPI?". Includes a stdlib Python checker with --self-test.
Explains Python regular expressions token by token, tests them on must-match and must-not-match samples with spans and named groups, and flags risky patterns: nested quantifiers that backtrack catastrophically, [A-z], unescaped dots, empty matches, and missing anchors, then proposes a safer rewrite. Use when a user asks "what does this regex do?", "why doesn't it match?", or "is this regex safe?". Includes a tested stdlib Python checker.
