Omh Application Threat Model

Application Threat Model

This is a Hermes-native application-threat-model workflow skill.

Why This Exists

application-threat-model exists because the nearest neighbour does not merely miss this request. security-safety-review maps the agent's own prompt, tool, credential, and dependency surface, so an application threat-model request came back as an agent tool inventory under a near-identical name — a confident wrong artifact rather than a miss, in the one domain where that costs most.

Do Not Use When

• The subject is the agent's own prompts, tools, files, credentials, dependencies, or destructive actions; use security-safety-review, which maps that runtime surface.
• The user wants defects found in a diff or a file; use code-review.
• The user asks whether a release is ready across rollout, rollback, and observability; use production-audit.
• The user asks which commands prove a merge is safe; use verification-gate.
• The user asks for a contractual or regulatory obligation rather than an attacker; use legal-compliance-review.

Examples

Good example:

• Prompt: build a threat model for our payment service architecture
• Expected behavior: Prepare application_threat_model/v1: ask for the component map and data flows, register card data and settlement records as assets, mark the merchant API edge and the PSP callback as trust boundaries, derive scenarios per boundary, decide a control for each, and name the test that fails when the control is removed.
• Why: The subject is an application the user operates, and the goal needs assets, boundaries, scenarios, controls, and tests.

Bad example:

• Prompt: application-threat-model check whether this agent can be prompt-injected through its file tool
• Expected behavior: Route to security-safety-review: prompts, tools, and credentials are the agent's runtime surface, not an application this workflow models.
• Why: The two surfaces share vocabulary and nothing else; modeling the agent's runtime here is how the artifacts get confused.

Completion Checklist

• Every asset carries a data class and one named loss; every boundary names what crosses it and what authenticates the crossing.
• Every scenario resolves to mitigate, transfer, accept, or eliminate, with an owner.
• Every mitigating control carries a security test and the observable that fails without it.
• Controls read deployed, planned, or unverified; none is inferred from the architecture description.
• Residual risk is listed, and the model is not offered as a scan, a penetration test, or an attestation.

Recovery Notes

• If the architecture is not described, ask for the component map and the data flows before modeling; never substitute a generic checklist for the real system.
• If a scenario has no boundary and no asset, drop it with the reason rather than carrying an unreachable threat.
• If the user asks for exploit code, give the precondition and the detection signal instead, then hand remediation to an executor.
• If the request turns out to be about the agent's own prompts, tools, or credentials, stop and hand it to security-safety-review.

Workflow Lane

• Current lane: Coding handoff (idea-to-deploy, llm-app-dev, cto-loop, deploy-and-monitor, code-review, build-failure-triage, verification-gate, security-safety-review, +28 more) - coding owners, handoffs, review, CI, and merge evidence.
• If intent belongs to another lane, hand back to oh-my-hermes or name the adjacent workflow.
• Shared product, routing, compatibility, and evidence rules: omh-routing/references/skill-common-rail.md.

Use When

Use when Hermes must model the security of an application, service, or deployed system the user operates: which assets are worth taking, where trust changes hands, how an attacker reaches each asset, which control stops them, and which security test fails when that control is removed. The subject is the modeled system, never the agent's own runtime.

Strong routing signals: `application-threat-model`, `application threat model`, `threat model`, `threat modeling`, `threat modelling`, `threat modeling session`, `threat modeling workshop`, `security threat model`, `build a threat model`, `model the threats`, `threat scenarios`, `stride analysis`, `stride model`, `trust boundary`, `trust boundaries`, `attack scenario`, `attack scenarios`, `attack tree`, `attack trees`, `abuse case`, `abuse cases`, `security design review`, `security architecture review`, `architecture security review`, `how would an attacker`, `how could an attacker`, `what could an attacker do`, `attacker perspective`

Catalog Metadata

Category: review Phase: application-threat-model Hermes role: reviewer Quality tier: security-safety-gated Reasoning demand: standard

Quality bar:

• Name every component, data store, and external dependency of the real system before naming one threat; a model of a system nobody described is a checklist.
• Give each asset a data class and exactly one loss: disclosure, corruption, unavailability, or fraud.
• For each trust boundary, state what crosses it, what authenticates the crossing, and what the receiver assumes without checking.
• Run all six STRIDE prompts from omh-application-threat-model/references/threat-model-method.md per boundary; drop an unreachable scenario with its reason instead of carrying it.
• Resolve every scenario to one decision (mitigate, transfer, accept, eliminate) with an owner, and give every mitigating control a test whose observable fails when the control is removed.

Handoff policy:

Keep the model in Hermes: assets, boundaries, scenarios, control decisions, and test definitions are analysis over architecture the user supplies. Writing the tests, running a scanner, changing an IAM policy, or patching a component is executor work and needs observed evidence before a control counts as deployed.

Required inputs:

• the system under review: components, which component calls which, and where each is deployed
• data flows and data classes: what every store, queue, and message carries
• known trust boundaries: authentication points, network edges, tenant separation, third parties
• controls already deployed, and who owns each
• scope exclusions and the threat actors in scope