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* docs(#3247): record the capability instruction-surface trust model ADR-2363 records the trust posture for third-party capability SKILL.md bodies, which #2322/#2340 made agent-invocable without any content-level control. The path-level protections that fix shipped are all present; no content scanner exists, and external-descriptor-trust.cts never had one. Nothing was bypassed - the control did not exist and the boundary was never written down. D1 records the posture: skill bodies are trusted, unscanned agent instructions. D2 rejects content scanning on Kerckhoffs (a shipped rule set is readable by the adversary who installs it), on threat-model non-transfer from ADR-1577 (there, instructions are anomalous inside data; here they are the payload's legitimate form), and on Goodhart (a scanned-OK line displaces the judgment the consent prompt exists to provoke). D3 replaces the executable/non-executable binary with three classes, adding instruction surface. D4 keeps instruction surfaces out of the v1 disclosureSignature. The signature is NOT the activation binding - hasProjectConsent compares contentHash only, and a global install carries no consent record at all. What re-encoding would do is perturb the signature of every skill-bearing capability and fire a spurious re-consent prompt on its next upgrade, which is what ADR-2782 D4 rule 5 already forbids. If instruction surfaces ever need to be signature-bound, that lands as a versioned v2 signature with a migration, never an in-place re-encoding. Corrects capability-trust-model.md, which claimed skills get lighter consent because they do not execute code - true, and not the relevant property, since the agent is the interpreter. Adds the author-side boundary to develop-a-capability.md and links it from publish-a-capability.md. Both state that per-skill disclosure at the consent prompt lands with #3248 and does not happen today. Docs-only. No behavior change; no consent record perturbed. D5's mechanism is Phase 1 (#3248), which is why the ADR is Proposed. Refs #2363 * chore(#3247): backfill changeset pr number to 3249 --------- Co-authored-by: sim <sim@local>
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type, pr
| type | pr |
|---|---|
| Fixed | 3249 |
Capability skill bodies are now documented as an instruction surface — the capability trust model previously grouped skills with inert assets as "non-executable" surfaces whose consent is lighter because they do not execute code. A skill body does not execute code; it instructs the agent that does. The docs now state that a capability's SKILL.md bodies reach your agent's instruction context verbatim and are not content-scanned, and capability authors are told the same on the authoring side. No behavior changed and no existing consent was invalidated. (#3247)