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fix(stpa): correct TCL numbering to ISO 26262-8 (TCL1) — issue #254 A1 #257

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fix(stpa): correct TCL numbering to ISO 26262-8 (TCL1) — issue #254 A1 #257

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15 changes: 12 additions & 3 deletions safety/stpa/tool-qualification.yaml
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Expand Up @@ -11,9 +11,18 @@
# s-expression evaluator, variant/PLE system, Zola export, needs-json
# import, MCP write tools, and git hook integration.
#
# Tool Confidence Level (TCL): TCL 1 (highest) — rivet's output is
# directly used as compliance evidence. A false PASS from rivet can
# prevent detection of a safety-critical gap.
# Tool Confidence Level (TCL): TCL1 (ISO 26262-8 §11.4.7) — rivet's
# output is directly used as compliance evidence, but oracle-gated
# validation raises Tool error Detection (TD) enough that the TI×TD
# matrix lands at TCL1. A false PASS from rivet can prevent detection
# of a safety-critical gap; the TI/TD analysis under Workstream A of
# the tool-qualification dossier qualifies that claim.
#
# Cross-walk: ISO 26262 numbers TCL inversely to DO-330. 26262 TCL1
# is the *lowest* confidence demand (TCL3 highest); DO-330 TQL-1 is
# the *highest* rigor (TQL-5 lowest). The legacy "TCL 1 (highest)"
# wording in this file mixed the two conventions; this file now
# follows ISO 26262 numbering.
#
# Reference: STPA Handbook §2.3, ISO 26262-8 §11.4.7
# =============================================================================
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