Borrowing it
Nothing to install: this file belongs to jnarowski/agentcmd. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/jnarowski/agentcmd/main/.claude/commands/cmd/implement-spec.mdgit clone --depth 1 https://github.com/jnarowski/agentcmdWrote 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/commands/jnarowski/agentcmd/implement-spec)<a href="https://agentmods.dev/commands/jnarowski/agentcmd/implement-spec"><img src="https://agentmods.dev/badge/commands/jnarowski/agentcmd/implement-spec/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/commands/jnarowski/agentcmd/implement-spec"><img src="https://agentmods.dev/badge/commands/jnarowski/agentcmd/implement-spec.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00011 | $0.02816 |
| Opus 5.5 | $0.00004 | $0.01126 |
| Sonnet 5.5 | $0.00002 | $0.00563 |
| Haiku 4.5 | $0.00001 | $0.00282 |
Grade A, and why
implement-spec 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 2mo 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.
How it starts
The opening of the file, as written. The whole thing — 334 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Implement
Follow the Workflow steps in the exact order to implement the spec then Report the completed work.
Variables
- $specIdOrNameOrPath: $1 (required) - Either a timestamp ID (e.g.,
2510241201), feature name (e.g.,workflow-safety), or full path
Instructions
Parse and resolve $specIdOrNameOrPath:
- If it's a full path (contains
/): use as-is - Otherwise, look up in
.agent/specs/index.json:- For timestamp ID: Match by
idfield - For feature name: Fuzzy match path (e.g.,
message-queuematchestodo/2510241201-message-queue-implementation/spec.md) - Use path from index:
.agent/specs/{path}
- For timestamp ID: Match by
- If not found in index.json, fallback to directory search:
- Search in order: todo/, backlog
- For ID: Pattern
{id}-*/spec.md - For feature name: Pattern
*{feature-name}*/spec.md(fuzzy match)
- If still not found: stop and report error
Task Tracking Requirements
CRITICAL: You MUST track your progress in the spec file as you work. This is NOT optional.
What to Update
-
Individual Tasks - Check off IMMEDIATELY after completing each task:
- Change
- [ ] 1.1 Task descriptionto- [x] 1.1 Task description - Do this AFTER finishing each task, NOT in batches
- Never move to the next task without checking off the current one
- Change
-
Completion Notes - Fill in after finishing each task group/phase:
- Each task group has a
#### Completion Notessection - Write 2-4 bullet points with:
- What was implemented
- Any deviations from the plan
- Important context for reviewers
- Known issues or follow-ups
- Each task group has a
Example of Good Progress Tracking
Before starting task 1.1:
### 1: Project Initialization
- [ ] 1.1 Initialize Bun project
- [ ] 1.2 Configure package.json
After completing task 1.1:
### 1: Project Initialization
- [x] 1.1 Initialize Bun project
- [ ] 1.2 Configure package.json
After completing all tasks in group 1:
### 1: Project Initialization
- [x] 1.1 Initialize Bun project
- [x] 1.2 Configure package.json
#### Completion Notes
- Project initialized with Bun and TypeScript
- Used stricter tsconfig settings than spec suggested for better type safety
- All dependencies installed successfully
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.
- 2mo ago First seen · 334 lines · 11 tokens per session scan A 3fbec5392adb
implement-spec is a command published in the GitHub repository jnarowski/agentcmd (18 stars, last pushed 10mo ago), licensed MIT. It adds 11 tokens to every session and 2,816 once invoked, about $0.0000 per session on Opus 5.5. 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 2026-09-01.
implement-spec compared with commands from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| implement-specjnarowski/agentcmd | Command | 18 | 10mo ago | MIT | A | 11 | Claude Code |
| checklistgithub/spec-kit | Command | 148k | yesterday | MIT | A | 13 | Claude Code |
| clarifygithub/spec-kit | Command | 148k | yesterday | MIT | A | 27 | Claude Code |
| specifygithub/spec-kit | Command | 148k | yesterday | MIT | A | 13 | Claude Code |
| analyzegithub/spec-kit | Command | 148k | yesterday | MIT | A | 26 | Claude Code |
| convergegithub/spec-kit | Command | 148k | yesterday | MIT | A | 35 | Claude Code |
| implementgithub/spec-kit | Command | 148k | yesterday | MIT | A | 14 | Claude Code |