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A policy governed qonto domain API and MCP assistant for binky-control.
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tegwick aa28ef353a QONTO-WP-0004-T03: verify key-cape IAM Profile tokens 
Replaces the interim shared-secret bearer token's role as the identity
boundary with real key-cape JWKS-based verification, closing the gap
docs/mcp-integration.md called out explicitly ("no OIDC issuer exists
in this fleet yet") -- key-cape's /jwks is a standard RS256 endpoint
and needed no key-cape-side work to consume.

KeyCapeTokenVerifier fetches and caches signing keys over httpx
(matching FlexAuthCheckClient's pattern elsewhere in this codebase),
validates iss/aud/exp and the IAM Profile v0.3 required claims, and
derives ActorClaims from the token (tenant, scopes, and a lane
inferred from the roles claim). Wired into auth.actor_claims_from_headers,
the single seam both REST and MCP already used -- a verified bearer
token now takes precedence over self-asserted X-Actor-* headers, and
can be made mandatory via QONTO_KEY_CAPE_REQUIRED once real tokens are
issued to callers. Off by default (no QONTO_KEY_CAPE_JWKS_URL set) so
existing deployments are unaffected until configured.

The QONTO_ASSISTANT_MCP_TOKEN shared secret remains as a documented
local-dev/legacy fallback, not the auth boundary going forward.

Verified: 13 new tests (test_key_cape_auth.py) covering valid/expired/
wrong-audience/wrong-issuer/missing-claim/unknown-key/rotated-key
tokens plus the auth.py precedence and required-vs-optional
integration paths, using a real generated RSA keypair and JWKS served
over httpx.MockTransport. Full suite -> 52 passed; REST and MCP smokes
both still pass against fixtures; compileall clean.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-24 00:10:41 +02:00
docs QONTO-WP-0004-T03: verify key-cape IAM Profile tokens 2026-07-24 00:10:41 +02:00
research Bootstrap qonto-assistant: intent, blueprint, research, workplans 2026-07-21 23:32:24 +02:00
scripts QONTO-WP-0003-T06: MCP smoke script + operator runbook update 2026-07-23 11:04:39 +02:00
specs Add SecurityPractice.md, Security Genome record, and deny-escalation lockout 2026-07-23 22:59:06 +02:00
src/qonto_assistant QONTO-WP-0004-T03: verify key-cape IAM Profile tokens 2026-07-24 00:10:41 +02:00
tests QONTO-WP-0004-T03: verify key-cape IAM Profile tokens 2026-07-24 00:10:41 +02:00
workplans chore(consistency): write back QONTO-WP-0004 hub IDs 2026-07-23 23:00:18 +02:00
.custodian-brief.md chore(consistency): sync task status from DB [auto] 2026-07-23 23:00:09 +02:00
.gitignore Bootstrap qonto-assistant: intent, blueprint, research, workplans 2026-07-21 23:32:24 +02:00
.repo-classification.yaml Complete Phase 1: policy kernel, REST service, and local smoke tooling 2026-07-22 21:21:05 +02:00
AGENTS.md Complete Phase 1: policy kernel, REST service, and local smoke tooling 2026-07-22 21:21:05 +02:00
INTENT.md Seeded intent and initial workplan 2026-07-22 00:31:50 +02:00
LICENSE Initial commit 2026-07-21 21:19:44 +00:00
Makefile Complete Phase 1: policy kernel, REST service, and local smoke tooling 2026-07-22 21:21:05 +02:00
pyproject.toml QONTO-WP-0004-T03: verify key-cape IAM Profile tokens 2026-07-24 00:10:41 +02:00
README.md QONTO-WP-0003-T07: close out Phase 2 MCP workplan 2026-07-23 13:56:06 +02:00
SCOPE.md Bootstrap qonto-assistant: intent, blueprint, research, workplans 2026-07-21 23:32:24 +02:00
WORK-RECORDS.md chore(consistency): write back QONTO-WP-0004 hub IDs 2026-07-23 23:00:18 +02:00

README.md

qonto-assistant

Policy-governed Qonto domain API and MCP assistant for Binky (and later multi-tenant dogfood).

One choke point for bank access across every coding agent and harness. Clients never hold the Qonto API key. v1 policy: read for awareness only — no spend, no volume-cost actions.

Start here

Doc What
INTENT.md Why this exists; boundaries
specs/ArchitectureBlueprint.md Architecture, phases, policy model
research/2026-07-21-mcp-gateway-and-governed-domain-assistant.md External + internal research
docs/operator-runbook.md How to run and verify Phase 1 (REST)
docs/mcp-integration.md How to run and verify Phase 2 (MCP)

Status

Phase 1 runtime is implemented:

  • Python 3.12 service under src/qonto_assistant/
  • default-deny YAML policy
  • Qonto read-only client (organization, transactions)
  • REST endpoints: /v1/health, /v1/accounts, /v1/transactions, /v1/snapshot
  • audit metadata, rate limiting, concurrency bounds, tests

Phase 2 (MCP surface, workplans/QONTO-WP-0003-mcp-surface.md) is finished: a streamable-HTTP MCP adapter is mounted at /mcp on the same capability core and policy kernel as REST — proven identical by test, not just by construction (tests/test_policy.py, tests/test_audit_parity.py) — with tools qonto_org_summary, qonto_list_transactions, and qonto_cost_run_rate_hints. The endpoint is gated by a shared-secret bearer token (QONTO_ASSISTANT_MCP_TOKEN); see docs/mcp-integration.md for the auth model, its explicit gap vs. the OIDC/workload target (no issuer exists in this fleet yet), and the shared multi-harness client config snippet. The finance-qonto-read agent-harness tool profile is documented (qonto-assistant side) but not yet registered in agent-harness itself — separate repo, separate workplan.

Current verification:

  • PYTHONPATH=src ../state-hub/.venv/bin/python -m pytest → 31 passed
  • python3 -m compileall src tests scripts
  • ../state-hub/.venv/bin/python scripts/smoke_rest_api.py --python ../state-hub/.venv/bin/python
  • ../state-hub/.venv/bin/python scripts/smoke_mcp.py --python ../state-hub/.venv/bin/python

Local fixture-backed smoke mode is available through QONTO_FIXTURE_DIR, so the service can be exercised without real Qonto credentials. The REST smoke checks both a 31-day recent snapshot and a 90-day recurring-cost snapshot; the MCP smoke additionally exercises the bearer-token auth gate and an out-of-catalog tool deny path.

Phase 3 (flex-auth resource finance.qonto.read, graduated quotas, redaction profiles) is not started — see workplans/QONTO-WP-0003-mcp-surface.md closure notes for the seed.

Normal local workflow, when toolchain support exists:

make install-dev
make test
make run

Related

  • OpenBao lane: tenants/binky/qonto-api (ops-warden binky-qonto-api)
  • First pull / CostRunRate: binky-control BINKY-WP-0005