Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/deepklarity/harness-kitnpx agentmods add skills/deepklarity/harness-kit/hk-breadcrumb-creatorWrote 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/deepklarity/harness-kit/hk-breadcrumb-creator)<a href="https://agentmods.dev/skills/deepklarity/harness-kit/hk-breadcrumb-creator"><img src="https://agentmods.dev/badge/skills/deepklarity/harness-kit/hk-breadcrumb-creator/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/skills/deepklarity/harness-kit/hk-breadcrumb-creator"><img src="https://agentmods.dev/badge/skills/deepklarity/harness-kit/hk-breadcrumb-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00109 | $0.02913 |
| Opus 5.5 | $0.00044 | $0.01165 |
| Sonnet 5.5 | $0.00022 | $0.00583 |
| Haiku 4.5 | $0.00011 | $0.00291 |
Grade A, and why
hk-breadcrumb-creator 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 1mo 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 — 329 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/hk-breadcrumb-creator — Workflow Breadcrumb Analysis
Traces a workflow through the harness-kit monorepo and produces a compact debugging reference. The output is for devs and agents who need to find where things break — not for onboarding docs or architecture overviews.
Context
<flow_context> $ARGUMENTS </flow_context>
If the context above is empty, ask: "Which flow do you want to trace? Describe it in terms of the user action or system event that kicks it off."
Step 0: Check existing breadcrumbs
Before scoping anything, read docs/breadcrumb_analysis/_INDEX.md to see what already exists. This file lists every breadcrumb folder and what it traces.
Compare the user's request against the existing entries and make one of three decisions:
-
Already covered — The flow is substantially documented in an existing breadcrumb. Tell the user which one covers it and what it contains. Ask if they want to update/extend that existing doc instead of creating a new one.
-
Partially overlapping — An existing breadcrumb covers part of the flow (e.g., user asks about "task execution" and
spec-task-lifecycle/02-execute-and-dispatch/covers the dispatch side but not the harness execution internals). Options:- Extend the existing breadcrumb (add sections to its FLOW/DETAILS/DEBUG files, or add a new sub-flow folder)
- Create a new breadcrumb that covers the non-overlapping portion, cross-referencing the existing one
-
New territory — Nothing in the index covers this flow. Proceed to Step 1.
When extending an existing breadcrumb, read its current FLOW.md first so you don't duplicate content. Add new information that complements what's there — don't rewrite sections that are already accurate.
When creating a new breadcrumb that's adjacent to an existing one, add cross-references in both directions (a "See also" line in the new doc pointing to the existing one, and optionally a note in the existing doc pointing to the new one).
Present your decision to the user before proceeding. Something like:
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.
- 1mo ago First seen · 329 lines · 109 tokens per session scan A f5a7c008565a
hk-breadcrumb-creator is a skill published in the GitHub repository deepklarity/harness-kit (102 stars, last pushed 3mo ago), licensed MIT. It adds 109 tokens to every session and 2,913 once invoked, about $0.0004 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 2026-08-30.
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