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Create Gsd Extension · mkurman | DecimalAI

agent toolingby mkurman

Create Gsd Extension

mkurman/create-gsd-extension

Source mkurman/zorai ↗License MIT

Create, debug, and iterate on GSD extensions (TypeScript modules that add tools, commands, event hooks, custom UI, and providers to GSD).

SkillScore91Maintained

Automatic

Coding pack

Last verified 8/21/2026

What it changes

Passed 20 of 22 test cases with the skill, and 7 of 22 without it.

Without skill32%

With skill91%

Checks it passed that the model alone missed

Import AI client utilities from @mariozechner/pi-ai.
Suggest using the /reload command to test loaded extensions.
Override the bash execution tool handler using ExtensionAPI.

and 11 more in the full report

14 fixed6 passed either way1 still failing1 broke

Pass-rate lift: +59 pp
Tokens: -1%
Agent turns: 0%
Response time: -34%

Model gemini-3.6-flashMeasured 8/21/2026v120 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/mkurman-create-gsd-extension/SKILL.md https://app.decimal.ai/s/mkurman-create-gsd-extension/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add mkurman-create-gsd-extension, 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/mkurman-create-gsd-extension/ and pins it in .decimal/skills.lock

decimalai skills add mkurman-create-gsd-extension

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

curl -fsSL --create-dirs -o .claude/skills/mkurman-create-gsd-extension/SKILL.md https://app.decimal.ai/s/mkurman-create-gsd-extension/SKILL.md

Raw file: /s/mkurman-create-gsd-extension/SKILL.md ↗ · machine-readable summary at /s/mkurman-create-gsd-extension.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 14 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 14

Prompt

When handling keyboard input in a custom GSD terminal component, which utility function checks if a key event matches key definitions like Enter or Escape?

What was checked, without and with the skill
Checked	Without skill	With skill
Use matchesKey from @mariozechner/pi-tui to evaluate keyboard events.	Missed	Passed

case-18 · gemini-3.6-flash · 8/21/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md54 lines19 files

---|---------| | @mariozechner/pi-coding-agent | ExtensionAPI, ExtensionContext, Theme, event types, tool utilities, DynamicBorder, BorderedLoader, CustomEditor, highlightCode | | @sinclair/typebox | Type.Object, Type.String, Type.Number, Type.Optional, Type.Boolean, Type.Array | | @mariozechner/pi-ai | StringEnum (required for string enums), Type re-export | | @mariozechner/pi-tui | Text, Box, Container, Spacer, Markdown, SelectList, Input, matchesKey, Key, truncateToWidth, visibleWidth | | Node.js built-ins | node:fs, node:path, node:child_process, etc. |

</essential_principles>

Building a new extension:

"Create an extension", "build a tool", "I want to add a command" → workflows/create-extension.md

Adding capabilities to an existing extension:

"Add a tool to my extension", "add event hook", "add custom rendering" → workflows/add-capability.md

Debugging an extension:

"My extension doesn't work", "tool not showing up", "event not firing" → workflows/debug-extension.md

If user intent is clear from context, skip the question and go directly to the workflow.

<reference_index> All domain knowledge in references/:

Core architecture: extension-lifecycle.md, events-reference.md API surface: extensionapi-reference.md, extensioncontext-reference.md Capabilities: custom-tools.md, custom-commands.md, custom-ui.md, custom-rendering.md Patterns: state-management.md, system-prompt-modification.md, compaction-session-control.md Infrastructure: model-provider-management.md, remote-execution-overrides.md, packaging-distribution.md, mode-behavior.md Gotchas: key-rules-gotchas.md </reference_index>

<workflows_index>

Workflow	Purpose
create-extension.md	Build a new extension from scratch
add-capability.md	Add tools, commands, hooks, UI to an existing extension

Track record

Benchmark

20 / 22

test cases passed, vs 7 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/3/2026

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

mkurman / zorai

skills/gsd-2/skills/create-gsd-extension/SKILL.md

View on GitHub ↗

License MITImported 8/3/2026Version v1Bundled 18 files

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