Triage storyboard failure

Triage a Storyboard Failure

Overview

Storyboards in compliance/cache/<version>/ are assertions about adopter behavior. They are not the spec — they are tests authored against the spec. Storyboards drift. When one fails, the question is which side is wrong: the adapter, the SDK, or the storyboard itself.

This skill is the rubric for that decision. It exists because adopter-facing failures look identical regardless of cause, and the wrong-direction fix (changing the SDK to satisfy a storyboard that disagrees with the spec) compounds drift across the ecosystem.

Upstream anchor. The spec normatively pins the spec → mock → SDK triage order at Mock-server authority and failure triage. This rubric implements that authority chain — when in doubt about which side is wrong, the spec is canonical, the mock interprets the spec, and the SDK consumes the spec via the mock.

When to Use

• A storyboard run step fails on an adapter you believe satisfies the spec
• The runner reports expect_error.code mismatch, context_outputs path did not resolve, or a response_schema failure on a response that round-trips through the generated TS types
• You're tempted to add a field, change an error code, or adjust a response shape "to make the test pass"

Not this skill:

• Real adopter bugs (your handler returns malformed data, throws unexpectedly, ignores a required field) — fix the adapter
• Wire-schema validation failures (additionalProperties, missing required) on requests YOU sent — fix the request

The rubric

For any failing step, work the three checks in order. Stop at the first answer.

1. Does the spec define the contract the storyboard is asserting?

Open the schema the storyboard's step references (schemas/cache/<version>/<protocol>/<tool>-response.json or similar). Find the field, error code, or shape the storyboard expects.

• Field exists in the spec, with the shape the storyboard expects → continue to step 2.
• Field exists in the spec but with a different shape → spec or storyboard mismatch; the storyboard is wrong. File upstream against adcontextprotocol/adcp. Cite the schema file path + line.
• Field does NOT exist in the spec → the storyboard authored an opinion that has no spec basis. The storyboard is wrong. File upstream.
• Spec is silent (the contract is ambiguous) → flag the spec gap upstream. The storyboard's interpretation may be reasonable, but adopters can't know which interpretation to follow without spec clarity.

2. Does the SDK shape match the spec?

If the spec defines the contract correctly, check whether the SDK's generated TS types and runtime validators match it. Read the relevant src/lib/types/*.generated.ts interface and confirm:

• Every required field in the schema is present and non-optional in the TS type

• Every discriminator (e.g., asset_type, status) is preserved (codegen sometimes strips oneOf discriminators when generating union types)

• Format constraints (date vs date-time, URL pattern, idempotency_key length/pattern) are reflected in either the TS type or the framework's runtime validator

• TS type matches spec, runtime validation works → continue to step 3.

• TS type allows what spec rejects (or vice versa) → SDK bug. Fix the codegen or hand-fix the type. File against adcp-client.

3. Is the storyboard's expectation actually testable from the request the runner sent?

Run the failing step in step mode (adcp storyboard step <agent> <storyboard_id> <step_id> --json) and inspect:

• The actual request payload the runner sent
• The actual response your adapter returned
• Each validations[] entry's pass/fail

Common patterns:

• context_outputs path did not resolve → the runner couldn't capture a value from your response under the expected path. Check whether the path matches what the spec defines (e.g., adcp#3892 captured rights_grant_id but the spec field is rights_id — storyboard was wrong).
• expect_error: code: X but your adapter returned a structured success response (e.g., AcquireRightsRejected with reason) → storyboard is asserting a thrown-error shape when the spec gives a first-class denial arm. Storyboard convention, not spec contract. File upstream.
• unresolved context variables from prior steps → the runner can't seed a variable the storyboard requires. Runner gap. File upstream against the storyboard runner.

Heuristics

• Generated TS types are not always tighter than the schema. Discriminator fields, additionalProperties: false constraints, and oneOf arms can be loosened during codegen. Trust the JSON Schema as ground truth.
• response_schema validation passes but the step still fails → almost always a storyboard context_outputs or expect_error mismatch. Your response is correct; the test's assertion is wrong.
• A storyboard expects a thrown error code (expect_error: true + code: X) when the spec defines a structured denial arm → the storyboard is shipping a non-spec convention. The Rejected/Pending/Acquired union is the canonical shape; thrown error codes are for system failures (timeout, unreachable), not policy decisions.
• requires_scenarios: in a storyboard YAML lists prerequisite scenarios that must run first. Step-mode runs lose this dependency; use full storyboard run mode to verify, then re-step the failing piece for diagnostics.

What to file

When the rubric points upstream, file with this template:

Title: <storyboard_id> step <step_id>: <assertion> is non-spec — <canonical_shape> is the canonical wire shape

Repro: Run any spec-compliant adapter; show the failing step's --json output.

Root cause: Cite the spec schema file path + line that defines (or is silent on) the contract the storyboard asserts.

Fix: Update the storyboard YAML (or the spec doc-comment, if the spec is genuinely ambiguous).

Cross-link to the adapter PR that surfaced it. The storyboard maintainers see the convergent signal across adopters and can prioritize.

Examples from production

Real triage walks from this codebase:

• adcontextprotocol/adcp#3892 (closed): brand-rights storyboard's acquire_rights step captured rights_grant_id via context_outputs. Spec field is rights_id. Cascading skip on next step. Resolution: spec → field is rights_id; storyboard is wrong; filed; closed.
• adcontextprotocol/adcp#3914 (open): brand-rights/governance_denied storyboard's acquire_rights_denied step expected thrown code: GOVERNANCE_DENIED. Spec gives AcquireRightsRejected arm with reason. Resolution: storyboard is asserting a non-spec convention; filed upstream; adapter ships spec-correct shape.
• adcontextprotocol/adcp#3913 (open): brand_rights/governance_denied storyboard step sync_governance skips because $context.governance_agent_url is unresolved; runner has no --context flag for full storyboard run mode. Resolution: runner gap, not adapter or spec gap; filed upstream.

See also

• CLAUDE.md (this repo): "When a compliance storyboard fails, triage before patching" — the inline guidance this skill expands.
• docs/guides/VALIDATE-YOUR-AGENT.md — adopter-facing validation flow that runs storyboards.
• docs/development/WIRE-VERSION-COMPAT.md — storyboard cache layout per spec version.