Module 9 of the build order — the differentiator. Where the other modules
detect and report, these are pure functions that ENFORCE an invariant and
raise: the write-time analogue of runtime least-privilege. They harden the
call a pipeline makes around its quarantined transform; the library makes no
model call itself.
Three asserts, matching the reusable-contract checklist (BRIEF §6 steps 3-4):
- assert_tool_less(request): the model request carries no tool surface —
tools/functions/tool_choice/function_call/mcp_servers, populated. Covers
both Anthropic and OpenAI request shapes; empty/None is genuinely tool-less.
- assert_credential_allowlist(env, allowed): the process env holds no
credential beyond this stage's allowlist (subset = least-privilege; the
enrichment stage sees only the model key, never the publish credential).
- scoped_env(env, allowed): the isolation primitive — strips off-allowlist
credentials, keeps PATH etc.; the assert then passes by construction.
Generalized from claude-code-llm-wiki tools/wiki_ingest/enrich.py
assert_quarantine (a pipeline-specific gate) into framework-agnostic pieces.
Two deliberate safety choices inherited from the reference: credential
detection is name-based (env VALUES are never read — value-scanning is the
output module's job); and a raised ContractViolation names only the offending
KEY, never a value, so it is safe to route to an alert channel (minimal-alert,
BRIEF §6 step 8). CREDENTIAL_NAME_RE ported verbatim from the proven reference.
23 new tests; 161 green total.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HyRCQMocjZ6SmSQ6JidJ2k
