Files
turnstone/tests
Patrick Buckley 21efeece32 fix(session): fence sender labels; move shared-ws behavior to a declaration
sec-1: the [message from <sender>] label was plain text, so a participant
could type a look-alike in their own message and impersonate another
sender to the model. Labels are now wrapped in a nonce-delimited
[start sender-label_<nonce>] ... [end sender-label_<nonce>] fence (new
fence.SENDER_LABEL_TAG, distinct value from the operator nonce) whose
token lives in the cached system prefix; participant content is
neutralized so typed look-alikes are defanged. A new
build_shared_workstream_declaration pins the token as the sole authentic
label.

sec-2 + q-1: the CONTEXT banner no longer embeds behavioral prose. It
carries a terse owner line + shared flag; the attribution rules, the
authenticity declaration, and the (now narrowed) tool-credential claim
move into the shared-workstream declaration. The credential claim is
corrected: per-participant credentials apply to MCP (OAuth) tools only;
built-in tools and skills run under the server/owner identity.

perf-3: _inject_sender_labels resolves each distinct sender's display
name once per call instead of once per turn, capping blocking storage
lookups at one per sender on the uncached error path.
2026-07-02 19:23:04 -07:00
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