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Microsoft Threat Modeling Tool (.tm7) Generator · github | DecimalAI

securityby github

Microsoft Threat Modeling Tool (.tm7) Generator

github/tm7-threat-model

Source github/awesome-copilot ↗License MIT

Creates valid Microsoft Threat Modeling Tool (.tm7) files compatible with the Microsoft Threat Modeling Tool v7.3+.

SkillScore67Maintained

Automatic

Security & AppSec pack

Last verified 8/2/2026

What it changes

Passed 15 of 22 test cases with the skill, and 7 of 22 without it.

Without skill33%

With skill67%

Checks it passed that the model alone missed

Process shapes specify i:type="StencilEllipse".
Process stencil specifies i:type="StencilEllipse".
Data store elements specify GenericTypeId of GE.DS.

and 9 more in the full report

10 fixed6 passed either way4 still failing2 broke

Pass-rate lift: +33 pp
Tokens: +167%
Agent turns: 0%
Response time: +33%

Model gemini-3.6-flashMeasured 8/2/2026v116 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/github-tm7-threat-model/SKILL.md https://app.decimal.ai/s/github-tm7-threat-model/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add github-tm7-threat-model, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/github-tm7-threat-model/ and pins it in .decimal/skills.lock

decimalai skills add github-tm7-threat-model

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/github-tm7-threat-model/SKILL.md https://app.decimal.ai/s/github-tm7-threat-model/SKILL.md

Raw file: /s/github-tm7-threat-model/SKILL.md ↗ · machine-readable summary at /s/github-tm7-threat-model.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 10 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 10

Prompt

Produce a .tm7 document for an IoT edge device submitting telemetry to an ingestion endpoint. How should the XML output stream be formatted regarding indentation and line wrapping?

What was checked, without and with the skill
Checked	Without skill	With skill
XML document contains no indentation spaces between elements.	Missed	Passed

case-15 · gemini-3.6-flash · 8/2/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md307 linessingle file

Microsoft Threat Modeling Tool (.tm7) Generator

You generate valid .tm7 files for the Microsoft Threat Modeling Tool (v7.3+). A .tm7 file is not generic XML — it is a WCF DataContractSerializer document with an exact namespace and element structure. If the structure is wrong, the tool refuses to open the file with:

"File is not an actual threat model or the threat model may be corrupted."

Your job is to translate a described system (components, data stores, external actors, data flows, trust boundaries) into a diagram plus STRIDE threats, serialized in the exact .tm7 format described below.

Workflow

When asked to produce a .tm7 file:

Model the system. Identify the elements:
- Processes (web apps, services, functions) → StencilEllipse, GE.P
- Data stores (databases, caches, queues, blobs) → StencilParallelLines, GE.DS
- External interactors (users, browsers, third-party systems) → StencilRectangle, GE.EI
- Trust boundaries → BorderBoundary, GE.TB
- Data flows connecting the above → Connector, GE.DF
Assign a unique lowercase UUID (e.g. 148ade68-5c80-40f3-8e1f-4e2cabdb5991) to every stencil and every flow. Never use human-readable ids like users-browser.
Lay out coordinates (Left/Top/Width/Height) so stencils don't overlap.
Generate STRIDE threats per interaction and place them in <ThreatInstances>.
Serialize using the structure in this guide, mirroring assets/example-minimal.tm7.
Validate against the "Common Mistakes" checklist before returning the file.
Write the file with no XML declaration and no pretty-print indentation (a single continuous XML stream is what the serializer emits).

Always open assets/example-minimal.tm7 first and adapt it — reuse its exact serialization skeleton and only change stencil types, names, coordinates, flows, and threats.

CRITICAL: Serialization format

TM7 files use WCF DataContractSerializer XML, not standard XML.

The file MUST start with this exact root element — no <?xml?> declaration:

Track record

Benchmark

15 / 22

test cases passed, vs 7 / 22 without

Adoption

Users: 6
Times used: 372

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 7/31/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

github / awesome-copilot

skills/tm7-threat-model/SKILL.md

View on GitHub ↗

License MITImported 7/31/2026Version v1

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

Microsoft Threat Modeling Tool (.tm7) Generator

Workflow

CRITICAL: Serialization format

Track record

Benchmark

Adoption

SkillSafety

Source

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