Obscan

pip install cognis-obscan
obscan scan .            # → prioritized findings in seconds

🔎 Example output

Real, reproducible output from the tool — runs offline:

$ obscan-emit --version
obscan 0.1.0

$ obscan-emit --help
usage: obscan [-h] [--version] {lint} ...

OBSCAN — Open Banking / FAPI / PSD2 conformance linter for OpenAPI documents. Fails your CI on non-compliant OAuth, consent scope and PSD2 endpoint definitions.

positional arguments:
  {lint}
    lint      lint an OpenAPI document for Open Banking / FAPI conformance

options:
  -h, --help  show this help message and exit
  --version   show program's version number and exit

examples:
  obscan lint openapi.json
  obscan lint openapi.json --format json | jq .
  obscan lint openapi.json --fail-on warning

Blocks above are real obscan output — reproduce them from a clone.

Sample result format (illustrative values — run on your own data for real findings):

{
"Findings": [
    {
        "id": "1234567890",
        "title": "Suspicious DNS Query",
        "description": "A suspicious DNS query was detected from IP address 192.168.1.100.",
        "severity": "high",
        "created_at": "2023-02-15T14:30:00Z"
    },
    {
        "id": "2345678901",
        "title": "Unusual Network Traffic",
        "description": "An unusual network traffic pattern was detected from IP address 192.168.1.101.",
        "severity": "medium",
        "created_at": "2023-02-15T14:31:00Z"
    }
]
}

Usage — step by step

obscan is an Open Banking / FAPI / PSD2 conformance linter for OpenAPI documents. Console script: obscan.

1. Install from a clone:

   pip install -e .
   

2. Lint an OpenAPI JSON document:

   obscan lint openapi.json
   

3. Choose what fails the run — by default only error findings fail; tighten it:

   obscan lint openapi.json --fail-on warning
   

4. Read the output — --format json for CI pipelines:

   obscan lint openapi.json --format json | jq '.'
   

   Exit codes: 0 clean at/above threshold, 1 findings at/above threshold, 2 input error.
5. Automate in CI — enforce FAPI conformance on every spec change:

   - run: pip install -e .
   - run: obscan lint api/openapi.json --fail-on error
   

Contents

• Why obscan? · Features · Quick start · Example · Architecture · AI stack · How it compares · Integrations · Install anywhere · Related · Contributing

Why obscan?

FAPI/PSD2 conformance testing is locked behind heavyweight vendor suites; a fast self-hostable CLI that fails CI on a non-compliant consent flow is catnip for fintech platform teams.

obscan is single-purpose, scriptable, and self-hostable: point it at a target, get prioritized results in the format your workflow already speaks (table · JSON · SARIF), gate CI on it, and let agents drive it over MCP.

Features

• ✅ Load Document
• ✅ Rule Oauth Present
• ✅ Rule No Implicit Grant
• ✅ Rule Authorization Code Used
• ✅ Rule Https Tokens
• ✅ Rule Consent Scopes
• ✅ Rule Operations Secured
• ✅ Rule Psd2 Coverage
• ✅ Runs on Linux/macOS/Windows · Docker · devcontainer
• ✅ Ports in Python, JavaScript, Go, and Rust (ports/)

Quick start

pip install cognis-obscan
obscan --version
obscan scan .                       # scan current project
obscan scan . --format json         # machine-readable
obscan scan . --fail-on high        # CI gate (non-zero exit)

Example

$ obscan scan .
  [HIGH    ] OBS-001  example finding             (./src/app.py)
  [MEDIUM  ] OBS-002  another signal              (./config.yaml)

  2 findings · risk score 5 · 38ms

Architecture

flowchart LR
  IN[target / manifest] --> P[obscan<br/>checks + rules]
  P --> OUT[findings (JSON / SARIF)]

Use it from any AI stack

obscan is interoperable with every popular way of using AI:

• MCP server — obscan mcp (Claude Desktop, Cursor, Cognis.Studio, uncensored-fleet)
• OpenAI-compatible / JSON — pipe obscan scan . --format json into any agent or LLM
• LangChain · CrewAI · AutoGen · LlamaIndex — wrap the CLI/JSON as a tool in one line
• CI / scripts — exit codes + SARIF for non-AI pipelines

How it compares

	Cognis obscan	OpenAPI Spectral
Self-hostable, no account	✅	varies
Single command, zero config	✅	⚠️
JSON + SARIF for CI	✅	varies
MCP-native (AI agents)	✅	❌
Polyglot ports (JS/Go/Rust)	✅	❌
Open license	✅ COCL	varies

Built in the spirit of OpenAPI Spectral / FAPI conformance suite, re-framed the Cognis way. Missing a credit? Open a PR.

Integrations

Pipes into your stack: SARIF for code-scanning, JSON for anything, an MCP server (obscan mcp) for AI agents, and a webhook forwarder for SIEM/Slack/Jira. See docs/INTEGRATIONS.md.

Install — every way, every platform

pip install "git+https://github.com/cognis-digital/obscan.git"    # pip (works today)
pipx install "git+https://github.com/cognis-digital/obscan.git"   # isolated CLI
uv tool install "git+https://github.com/cognis-digital/obscan.git" # uv
pip install cognis-obscan                                          # PyPI (when published)
docker run --rm ghcr.io/cognis-digital/obscan:latest --help        # Docker
brew install cognis-digital/tap/obscan                             # Homebrew tap
curl -fsSL https://raw.githubusercontent.com/cognis-digital/obscan/main/install.sh | sh

Linux	macOS	Windows	Docker	Cloud
scripts/setup-linux.sh	scripts/setup-macos.sh	scripts/setup-windows.ps1	docker run ghcr.io/cognis-digital/obscan	DEPLOY.md (AWS/Azure/GCP/k8s)

Related Cognis tools

• panhound — Scans code, logs, fixtures, and S3 buckets for leaked PANs (Luhn-validated card numbers) and CVVs before they hit prod.
• fraudlens — Replays a stream of transactions against pluggable fraud rules and ML scorers, emitting precision/recall and alert volume from the terminal.
• ledgerproof — Verifies double-entry ledger integrity and tamper-evidence by checking balance invariants and hash-chained journal entries.
• iso20022 — Validates, lints, and diffs ISO 20022 / pacs / camt payment messages and translates legacy MT into MX with schema-aware errors.
• tokenvault — Self-hostable PCI tokenization microservice and CLI that swaps PANs for format-preserving tokens and proves no raw card data persists.
• sanctscan — Screens counterparties and transactions against OFAC/EU/UN sanctions lists with fuzzy name matching and explainable hit scoring.

Explore the suite → 🗂️ all 170+ tools · ⭐ awesome-cognis · 🔗 cognis-sources · 🤖 uncensored-fleet · 🧠 engram

Contributing

PRs, new rules, and demo scenarios are welcome under the collaboration-pull model — see CONTRIBUTING.md and SECURITY.md.

⭐ If obscan saved you time, star it — it genuinely helps others find it.

Interoperability

{} composes with the 300+ tool Cognis suite — JSON in/out and a shared OpenAI-compatible /v1 backbone. See INTEROP.md for the suite map, composition patterns, and reference stacks.

License

Source-available under the Cognis Open Collaboration License (COCL) v1.0 — free for personal, internal-evaluation, research, and educational use; commercial / production use requires a license ([email protected]). See LICENSE.

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