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 skills add jeffreytse/grimoire-core --skill apply-bcg-matrixgit clone --depth 1 https://github.com/jeffreytse/grimoire-coreWrote 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/jeffreytse/grimoire-core/apply-bcg-matrix)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/apply-bcg-matrix"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-bcg-matrix/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/jeffreytse/grimoire-core/apply-bcg-matrix"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-bcg-matrix.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 | $0.00054 | $0.01777 |
| Opus 5.5 | $0.00022 | $0.00711 |
| Sonnet 5.5 | $0.00011 | $0.00355 |
| Haiku 4.5 | $0.00005 | $0.00178 |
Grade A, and why
apply-bcg-matrix 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Apply BCG Matrix
Classify each product, business unit, or initiative in a portfolio by its market growth rate and its relative market share, then direct cash and investment according to the quadrant — rather than funding every unit at a similar level regardless of its actual economics.
Why This Is Best Practice
Origin: Bruce Henderson and the Boston Consulting Group developed the growth-share matrix in the early 1970s to give diversified corporations a way to allocate capital across business units based on two observable variables — the growth rate of the unit's market and the unit's market share relative to its largest competitor — rather than allocating capital based on each unit's own requested budget or historical share of corporate spend.
Adopted by: The BCG matrix became a standard tool at diversified conglomerates managing large, multi-business portfolios through the 1970s–1990s (General Electric's business-screen matrix is a direct descendant) and remains standard content in corporate-strategy and portfolio-management curricula. It is still used informally whenever a company maps a product portfolio, business-unit set, or investment lineup against growth and share to decide where to concentrate capital.
Impact: The matrix's central empirical insight — drawn from the experience-curve research BCG conducted in parallel — is that units with high relative market share in their category generate disproportionately more cash than their revenue share alone suggests (due to cumulative-volume cost advantages), while low-share units in the same market structurally struggle to reach profitability regardless of effort. Portfolios managed without this distinction routinely over-invest in unprofitable, low-share "dogs" out of sunk-cost attachment while under-funding high-potential "stars" that need capital to defend their position during the high-growth phase.
Why best: The alternative — funding every business unit at a similar percentage of its own revenue, or by internal political weight — ignores that units in different quadrants have fundamentally different cash dynamics: cash cows generate surplus cash beyond what they need to defend their position; stars consume cash to defend a growing position; question marks consume cash with uncertain payoff; dogs consume cash with little prospect of ever generating a return. Classifying first makes the capital-allocation decision follow the unit's actual economic role in the portfolio rather than its historical claim on the budget.
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 · 73 lines · 54 tokens per session scan A f3200a535ff1
apply-bcg-matrix is a skill published in the GitHub repository jeffreytse/grimoire-core (5 stars, last pushed 5d ago), licensed MIT. It adds 54 tokens to every session and 1,777 once invoked, about $0.0002 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 2026-09-03.
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