fix(identity): accept Entra's space-delimited scp string claim (Copilot SystemError) - #244
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Microsoft Entra packs the delegated-scope claim `scp` as a
space-delimited STRING (`"access_as_user User.Read"`), but the verifier
deserialized `scp` only as a JSON array. Every Entra delegated token
therefore failed verification with
JWT verification failed: JSON error: invalid type: string
"access_as_user", expected a sequence
i.e. a bare 401 — which Copilot Studio surfaced to the operator as an
opaque `SystemError` with nothing actionable. Confirmed live 2026-08-30:
`POST /a2a` from CopilotStudio PowerFx reached the pod and was rejected
with exactly this error_detail.
`scp` now deserializes from either a string (whitespace-split, the OAuth2
`scope` convention Entra follows) or an array. `scopes()` is unchanged.
Test: scp string form, array form, scope-only fallback, and absent all
deserialize and yield the right scopes.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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The actual Copilot Studio SystemError
With the card-path fix (#243) deployed, Copilot Studio's runtime finally reaches the agent:
POST /a2afromCopilotStudio PowerFx/1.99.0hit the pod (2026-08-30). It was rejected 401 with:Microsoft Entra packs the delegated-scope claim
scpas a space-delimited string ("access_as_user User.Read"). The verifier deserializedscponly as a JSON array, so every Entra delegated token failed at deserialization — before any scope/audience logic — as a bare 401. Copilot surfaces that as an opaqueSystemErrorwith no detail, which is why it looked Microsoft-side.Fix
scpnow deserializes from either a string (whitespace-split, exactly the OAuth2scopeconvention Entra follows) or an array.scopes()is unchanged; Google tokens (array/scope) are unaffected.Test
scp_claim_accepts_both_entra_string_and_array_forms: string form, array form,scope-only fallback, and absent-all each deserialize and yield the right scopes.cargo test -p triton-identity→ 6 passed; clippy clean.🤖 Generated with Claude Code
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