Introduces the External Capability abstraction: platform-registered,
org-enabled document/media transform services invoked as side effects of
an AgentRun. The first concrete capability is pdf_to_md_bundle backed by
MinerU. This lands the contract, schema, adapter interface, and a fully
mock-tested adapter; the real MinerU HTTP client is deferred until
credentials and pricing are confirmed.
Contract:
- spec/Spec/System/Agent/Capability.lean pins ExternalCapability,
OrganizationCapabilityConnection (reuses ADR-0024 envelope, distinct
from model-provider connection), and CapabilityInvocation.Authorized
(workspace containment predicate, ADR-0018). lake build green (41 jobs).
- ADR-0027 records why capability credentials are a separate connection
type (MinerU/Whisper have their own auth shape, not OpenRouter /v1/models),
the adapter seam, and what is deferred (capability invocation record,
pricebook, agent-facing tool discovery).
Schema:
- OrganizationCapabilityConnection + CapabilityCredentialVersion, mirroring
the Feishu Application Connection shape. Unique by (organizationId,
capabilityId). Migration 20260718130000 applied.
Adapter (hub/src/capability):
- types.ts: CapabilityId, CapabilityAdapter interface, secret payload,
CapabilityConnectionUnavailable.
- mineruClient.ts: MineruClient interface + MineruParseResult + errors.
Real HTTP client deferred; the interface is the seam.
- capabilityConnections.ts: resolveCapabilityCredential — org-scoped,
fail-closed, reuses LocalSecretEnvelope with purpose="capability".
- pdfToMdBundle.ts: adapter that resolves credential, confines input/output
to the run workspace (ADR-0018), calls MineruClient, writes md + images
into workspace, and writes a UsageFact (kind=external_capability,
quantity=pages, costSource=provider_reported|unknown per ADR-0022).
Tests (7, all green):
- md + images written to workspace, UsageFact attributes pages + cost
- costUsd null -> costSource=unknown (missing cost != zero, ADR-0022)
- no ACTIVE connection -> fail-closed, no fact written
- input/output path escape -> CapabilityPathEscape
- MinerU client error propagates, no fact written
- empty markdown -> parse failure
Deferred (needs operator): MinerU account/API key/pricing, real MineruClient
HTTP implementation, org admin UI for capability connection management,
agent-facing tool exposure (MCP vs built-in).
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