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Spike Wrap Up · open-gsd | DecimalAI

agent toolingby open-gsd

Spike Wrap Up

open-gsd/spike-wrap-up

Source open-gsd/gsd-pi ↗License MIT

Package findings from a completed spike into a durable project-local skill that auto-loads on future similar work. Reads the latest `.gsd/workflows/spikes/` dir, interviews the user on what's reusable, then writes `.agents/skills/<name>/SKILL.md`.

SkillScore70Maintained

Automatic

AI Engineer pack

Last verified 10/10/2026

What it changes

Passed 14 of 20 test cases with the skill, and 8 of 20 without it.

Without skill40%

With skill70%

Checks it passed that the model alone missed

Offers to record the decision with gsd_decision_save
Asks the user whether a skill is needed before proceeding
Saves reusable starter files under .agents/skills/<name>/templates/

and 4 more in the full report

6 fixed8 passed either way6 still failing0 broke2 errored

Pass-rate lift: +30 pp
Tokens: +55%
Agent turns: 0%
Response time: -43%

Model gemini-3.6-flashMeasured 10/10/2026v214 of 22 cases passed with skill · 20 comparable

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/open-gsd-spike-wrap-up/SKILL.md https://app.decimal.ai/s/open-gsd-spike-wrap-up/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add open-gsd-spike-wrap-up, 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/open-gsd-spike-wrap-up/ and pins it in .decimal/skills.lock

decimalai skills add open-gsd-spike-wrap-up

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

curl -fsSL --create-dirs -o .claude/skills/open-gsd-spike-wrap-up/SKILL.md https://app.decimal.ai/s/open-gsd-spike-wrap-up/SKILL.md

Raw file: /s/open-gsd-spike-wrap-up/SKILL.md ↗ · machine-readable summary at /s/open-gsd-spike-wrap-up.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 6 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 6

Prompt

During the spike at `.gsd/workflows/spikes/tailwind-config/`, we created a reusable starter configuration file `tailwind.config.js`. In which subfolder of the skill should this template artifact be saved?

What was checked, without and with the skill
Checked	Without skill	With skill
Saves reusable starter files under .agents/skills/<name>/templates/	Missed	Passed

case-13 · gemini-3.6-flash · 10/10/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md135 linessingle file

GSD already watches .agents/skills/ (and .claude/skills/ as a legacy compat path) at both user and project levels — see src/resources/extensions/gsd/skill-discovery.ts. Any skill written there is picked up on the next session without further wiring. This skill is the bridge from "spike done" to "skill available."

Invocation points:

End of Phase 3 (synthesize) in /gsd start spike — prompt suggests running this skill
User has a spike directory and wants to harvest it
Pre-existing RECOMMENDATION.md that deserves a permanent home

<core_principle> NOT EVERY SPIKE DESERVES A SKILL. If the recommendation was "don't do X," there may be no reusable guidance. Ask the user first; exit without writing if the answer is no.

PROJECT-LOCAL, NOT USER-GLOBAL. Write to .agents/skills/ in the project root, not ~/.agents/skills/. The skill encodes project-specific choices that should not leak into unrelated projects.

DESCRIPTION IS THE DISCOVERABILITY SIGNAL. The description field in frontmatter is the primary signal the agent uses to judge relevance and decide whether to load the skill — it is a heuristic, not a deterministic trigger. Write it as keywords the future agent will plausibly encounter, not a summary. </core_principle>

Step 1: Find the spike

List directories under .gsd/workflows/spikes/ — sort by mtime, newest first.
If multiple exist, ask the user which to wrap up. Default: the most recent.
If none exist, tell the user and stop. This skill requires a completed spike.

Read the core files:

<spike>/SCOPE.md — the question that was asked
<spike>/research/*.md — the angles investigated
<spike>/RECOMMENDATION.md — the conclusion

Step 2: Decide if it deserves a skill

Track record

Benchmark

14 / 20

test cases passed, vs 8 / 20 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 v5 — 10/8/2026

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

open-gsd / gsd-pi

src/resources/skills/spike-wrap-up/SKILL.md

View on GitHub ↗

License MITImported 10/8/2026Version v2

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davepoon/gsd:spike-wrap-upPackage spike findings into a persistent project skill for future build conversationsClose match+55 pp pass-rate lift

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