OpenSpec is a specification-driven development framework that records software requirements and implementation plans as readable Markdown artifacts. It helps developers and AI coding assistants agree on what should be built before code is written, including work spanning multiple repositories. The catalogue add-ons provide workflow skills and instructions for using OpenSpec.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/fission-ai/openspec/openspec-new-changenpx skills add Fission-AI/OpenSpec --skill openspec-new-changegit clone --depth 1 https://github.com/Fission-AI/OpenSpecWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/fission-ai/openspec/openspec-new-change)<a href="https://agentmods.dev/skills/fission-ai/openspec/openspec-new-change"><img src="https://agentmods.dev/badge/skills/fission-ai/openspec/openspec-new-change.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00040 | $0.00864 |
| Opus 5 | $0.00020 | $0.00432 |
| Sonnet 5 | $0.00008 | $0.00173 |
| Haiku 4.5 | $0.00004 | $0.00086 |
Grade A, and why
openspec-new-change scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
8 near-identical copies found in the catalogue:
- openspec-new-change — 98% identical, 3 lines differ
- openspec-new-change — 98% identical, 3 lines differ
- openspec-new-change — 97% identical, 1 lines differ
- openspec-new-change — 95% identical, 1 lines differ
- openspec-new-change — 95% identical, 1 lines differ
- openspec-new-change — 89% identical, 5 lines differ
- openspec-new-change — 89% identical, 5 lines differ
- openspec-new-change — 89% identical, 5 lines differ
What it actually says
Start a new change using the experimental artifact-driven approach.
Store selection: If the user names a store (a store is a standalone OpenSpec repo registered on this machine) or the work lives in one, run openspec store list --json to discover registered store ids, then pass --store <id> on the commands that read or write specs and changes (new change, status, instructions, list, show, validate, archive, doctor, context, schemas, view). Once selected, treat --store <id> as sticky for the rest of the workflow. Every unscoped example of those commands below is shorthand: before running it, append the flag. For example, run openspec status --change "<name>" --json --store "<id>", not the unscoped form shown below. Other commands do not take the flag. Hints printed by commands already carry the flag; keep it on follow-ups. Without a store, commands act on the nearest local openspec/ root.
Input: The user's request should include a change name (kebab-case) OR a description of what they want to build.
Steps
-
If no clear input provided, ask what they want to build
Ask the user (open-ended, no preset options):
"What change do you want to work on? Describe what you want to build or fix."
From their description, derive a kebab-case name (e.g., "add user authentication" →
add-user-auth).IMPORTANT: Do NOT proceed without understanding what the user wants to build.
-
Determine the workflow schema
Use the default schema (omit
--schema) unless the user explicitly requests a different workflow.Use a different schema only if the user mentions:
- A specific schema name → use
--schema <name> - "show workflows" or "what workflows" → run
openspec schemas --jsonand let them choose
Otherwise: Omit
--schemato use the default. - A specific schema name → use
-
Create the change directory
openspec new change "<name>"Add
--schema <name>only if the user requested a specific workflow. This creates a scaffolded change in the planning home resolved by the CLI. -
Show the artifact status
openspec status --change "<name>" --jsonUse the returned
planningHome,changeRoot,artifactPaths, andnextStepsinstead of assuming repo-local paths. -
Get instructions for the first artifact The first artifact depends on the schema (e.g.,
proposalfor spec-driven). Check the status output to find the first artifact with status "ready".openspec instructions <first-artifact-id> --change "<name>"This outputs the template and context for creating the first artifact.
-
STOP and wait for user direction
Output
After completing the steps, summarize:
- Change name and location
- Schema/workflow being used and its artifact sequence
- Current status (0/N artifacts complete)
- The template for the first artifact
- Prompt: "Ready to create the first artifact? Just describe what this change is about and I'll draft it, or ask me to continue."
Guardrails
- Do NOT create any artifacts yet - just show the instructions
- Do NOT advance beyond showing the first artifact template
- If the name is invalid (not kebab-case), ask for a valid name
- If a change with that name already exists, suggest continuing that change instead
- Pass --schema if using a non-default workflow
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago First seen · 77 lines · 40 tokens per session scan A 0752814373e9
openspec-new-change is a skill published in the GitHub repository Fission-AI/OpenSpec (67,322 stars, last pushed yesterday), licensed MIT. It adds 40 tokens to every session and 864 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other skills, from other repositories
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openprd-harness
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openprd-shared
OpenPrd 工作区与产物的共用守则。凡是需要查看、更新或推进 OpenPrd 工作区,包括 classify、interview、synthesize、diagram、freeze、handoff、图示评审或解读 .openprd/ 状态文件时,都优先使用这份共用规则。.
openprd-frontend-design
为 OpenPrd 的界面、页面、视觉、样式和前端体验任务提供设计资产框架、审美立意、反 AI 味门禁和实现前方向评审规则。.
openprd-discovery-loop
把自然语言里的 OpenPrd 或 OpenSpec 深度、持续、全面、参考挖掘、需求发现类请求,路由到 OpenPrd 的长程 discovery 工作流。适用于继续推进、深度分析、全面补齐、对标复刻或完善 requirements、specs 和 tasks 的场景。.
openprd-quality
评估 OpenPrd 的可观测性、业务成本与滥用护栏、评估执行环境覆盖、媒体证据、性能基线、极端场景,以及 HTML 质量评估报告和项目级经验 Skill。.