capacity-check

capacity-check is a skill for Claude Code, Codex from msolecki/founder-os. It costs 30 tokens per session (1,199 once invoked), scanned A, original, MIT.

A work-capacity calculation that compares promised project hours and upcoming start dates with the founder’s actual working time.

In plain words
What is it for?
Use it before accepting a client, extra deliverable or start date. It helps determine whether the work fits and when it can begin.
Why use it?
It prevents accepting work based on an overly optimistic estimate, especially when several projects compete for attention.

Skill for Claude CodeCodex

Written for Claude Code and Codex: shipped in a Claude Code plugin, but also agents/openai.yaml present.

Part of the founder-os plugin — 57 skills, 13 agents, 4 hooks, 1 MCP server shipped together

Install

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.

agentmods
npx agentmods add skills/msolecki/founder-os/capacity-check
Any agent
npx skills add msolecki/founder-os --skill capacity-check
Clone the repo
git clone --depth 1 https://github.com/msolecki/founder-os

Made for: Claude Code, Codex.

Or install founder-os, the plugin that ships this one along with the rest of its 57 skills, 13 agents, 4 hooks, 1 MCP server.

Wrote 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.

agentmods badge for capacity-check

README.md
[![agentmods](https://agentmods.dev/badge/skills/msolecki/founder-os/capacity-check.svg)](https://agentmods.dev/skills/msolecki/founder-os/capacity-check)
Your own site
<a href="https://agentmods.dev/skills/msolecki/founder-os/capacity-check"><img src="https://agentmods.dev/badge/skills/msolecki/founder-os/capacity-check.svg" alt="Measured on agentmods" height="20"></a>
Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,199 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00030 $0.01199
Opus 5 $0.00015 $0.00600
Sonnet 5 $0.00006 $0.00240
Haiku 4.5 $0.00003 $0.00120

Measured 6d ago against content hash 94fe9a6b3196, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

capacity-check 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.

founder-os/skills/capacity-check/SKILL.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Capacity Check

The founder has a number in their head for how many hours a week they can deliver. It is wrong, it is always high, and it is the number they quote start dates from. This skill replaces it with arithmetic.

When to use

Before saying yes to anything with hours in it: a new engagement, an added deliverable, a start date the Pipeline Coach wants to promise a prospect. Also when three projects are already running and a fourth is being discussed cheerfully.

Inputs

Read first, in order — house rule 1:

  • clients/ — every active engagement, its committed hours and remaining scope
  • pipeline.md — any deal with a start date inside the horizon; those are committed hours the founder has not counted yet
  • metrics.md — last month's actual hours worked, if logged. Actuals beat estimates, always.

Beliefs

  • Fragmentation costs more than volume. Four engagements at five hours each do not fit into the twenty hours that three engagements at seven hours fit into. The founder estimates in blocks and delivers in slices, and no amount of discipline converts one into the other.
  • A thirty-minute call at 11am does not cost thirty minutes, it costs the morning. Meetings priced at their duration are why the arithmetic balances and the week does not. Count the block the meeting lands in, not the invite.
  • Capacity does not respond to motivation. An energised week and a miserable week produce roughly the same deliverable hours — the difference shows up in how the founder narrates them afterwards, not in the timesheet. A schedule that assumes a good week is a schedule that assumes a coin lands heads.
  • The client the founder would drop everything for should be quoted the longest lead time, not the shortest. Willingness to rearrange the week is not a discount that client earned; it is an unpriced option they were handed, and the week it gets exercised is the week the other three engagements slip.

Steps

  1. Start from the week, not the month. Monthly capacity hides the fact that work arrives in weeks. 160 hours a month is a fiction. 40 hours next week, with two deadlines in it, is a fact.
  2. Subtract the non-delivery load explicitly, line by line:
    • sales — 6h/week, minimum, non-negotiable. The week the founder stops selling is a revenue hole that opens 60 days later, when nobody remembers what caused it.
    • admin, invoicing, bookkeeping handoff — 3h/week.
    • context switching — 1h/week per active engagement. Four clients costs four hours before a line of work happens.
    • What remains is deliverable. For most solo founders it lands near 22h/week, not 40. If your arithmetic says 35, you have forgotten something.
  3. Sum the committed hours. Remaining scope per engagement in clients/, divided by the weeks left before its deadline. Add anything in pipeline.md with a start date inside the window.
  4. Apply the rule:
    • over 80% of deliverable hours committed → the answer is no. Not "tight", not "we'd have to push". No. At 80% one sick day is a missed deadline and there is nobody to cover.
    • 60–80% → yes, but only with a named slip. Say which client's deliverable moves and by how long, before the founder answers the prospect.
    • under 60% → capacity is not the constraint. The problem is in pipeline.md and this is the wrong skill.
  5. Refuse the fantasy number. "I'll just work the weekend" is not capacity. It is a loan against next month at an interest rate the founder never quotes. Either they name which of the next four weekends they are giving up — written down, in clients/_capacity.md — or it does not count. Vague heroism has never once repaid.

Read the full file on GitHub · 106 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

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.

  1. 6d ago First seen · 106 lines · 30 tokens per session scan A 94fe9a6b3196

Subscribe to this mod's changes

capacity-check is a skill published in the GitHub repository msolecki/founder-os (4 stars, last pushed 3d ago), licensed MIT. It adds 30 tokens to every session and 1,199 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 2026-08-31.

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