test(contract): add the §10.1 rule-8 guardrail regression tests - #13
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CONTRACT.md §10.1 rule 8 — "subject of the decision" — was the one part of the local-verification set with no regression test outside PHP, TypeScript and Python. §15.1 hand-verified that every guard rejects correctly, so this closes a missing guardrail rather than a live defect. Rules 1-7 ask whether the token is good. Rule 8 asks whether it is the token the decision is even about. SEC-085 satisfied all seven and was still an authentication bypass: the PHP guard routed a failed verification into a second, successful one against the application's own session, admitting the caller as the app's service account. Each test asserts its precondition rather than assuming it: a second, fully valid credential for a more privileged principal is first shown to pass the same guard, so a fallback would genuinely have succeeded. Without that, the tests would pass merely because nothing was available to substitute — the trap the PHP reference test documents at length. Every test was falsified by injecting the SEC-085 fallback into the guard and confirming it fails. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SkTHvZQMV47t3UwkEtmB1D
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Adds the CONTRACT.md §10.1 rule-8 guardrail regression tests — the one part of the local-verification set with no test outside PHP, TypeScript and Python.
The rule
Rules 1-7 ask whether the token is good. Rule 8 asks whether it is the token the decision is even about. SEC-085 satisfied all seven and was still an authentication bypass: the PHP guard routed a failed verification into a second, successful one against the application's own session, admitting the caller as the app's service account.
This SDK is structurally safe from that shape —
TokenAuthenticatorholds aJwksVerifierand a tenant id, never aClientwith a session — so these tests pin the property rather than fix a defect. §15.1 hand-verified every guard already rejects correctly; this closes a missing guardrail.Tests (3)
rule 8 — a failed caller token is rejected while another valid token exists— an app-owned token (same key, same tenant, genuinely fresh) is first asserted to verify, so a fallback would really have succeeded. The caller's expired token fails rule 2 and nothing else.rule 8 — the guard authenticator decides on the request's own credential— exercises theAxiamGuardpath, not just the authenticator. A recording extractor proves exactly one credential was consulted, and it was the caller's.rule 8 — the authenticator holds no client and therefore no session— astatic_assertthatTokenAuthenticatorremains constructible from a verifier and tenant alone, so making aClientthe only way to build one would have to be a deliberate act rather than silent drift.Falsified: adding an SEC-085 fallback to
try_authenticatefails test 1 on both assertions.Verified locally: 110 test cases, 389 checks, 0 failed.
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https://claude.ai/code/session_01SkTHvZQMV47t3UwkEtmB1D
Generated by Claude Code