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 kdr/overcast --skill overcast-event-bisectgit clone --depth 1 https://github.com/kdr/overcastWrote 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/kdr/overcast/overcast-event-bisect)<a href="https://agentmods.dev/skills/kdr/overcast/overcast-event-bisect"><img src="https://agentmods.dev/badge/skills/kdr/overcast/overcast-event-bisect.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 | $0.00043 | $0.00646 |
| Opus 5 | $0.00022 | $0.00323 |
| Sonnet 5 | $0.00009 | $0.00129 |
| Haiku 4.5 | $0.00004 | $0.00065 |
Grade A, and why
overcast-event-bisect 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 7d 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 — 66 lines — stays where its author put it; the contents beside it link to each section on GitHub.
overcast-event-bisect
Use this skill when a video contains a single MONOTONE transition — a condition
that is false before some instant and true after it (or vice versa), and does not
flip back. Binary search finds it in about log2(window/precision) vision calls
(~12 calls localizes to ~1s inside an hour). Use the broad overcast skill and
overcast/reference/verbs.md for exact flags.
Workflow
- Local clip + record id (
see frame://needs media on disk):
overcast doctor --json
overcast case init --json
overcast watch ./clip.mp4 --json # -> record id REC (also gives shot context)
- Confirm the transition is bracketed AND monotone — the two endpoints must disagree on the predicate:
overcast see frame://REC@<lo> --prompt "Is <predicate> true? answer only yes or no" --json
overcast see frame://REC@<hi> --prompt "Is <predicate> true? answer only yes or no" --json
If both give the same answer, the flip isn't in [lo,hi]. If the predicate
toggles more than once, it isn't monotone — use overcast-pinpoint instead.
- Bisect: test the midpoint, keep the half that still straddles the flip, repeat
until
hi - lois within your precision:
overcast see frame://REC@<mid> --prompt "Is <predicate> true? answer only yes or no" --json
# keep the straddling half: if mid's answer == lo's answer, set lo=mid; else hi=mid
# (correct whichever way it flips — false->true OR true->false)
- Report the transition window and show it:
overcast note "<predicate> flips" --ref REC --at <lo-hi> --confidence high --json
overcast view REC --at <lo-hi> --json
overcast brief --export ./transition.md --json
Output
The converged [lo, hi] bracket — the two adjacent see frames that straddle
the flip (their record.ids + media.at) — and the call count. That bracket IS
the answer window — don't over-claim a single frame.
Caveats
Bisection is only valid for a one-way change; a light that blinks or a person who
comes and goes will mislead it — verify monotonicity at step 2, and fall back to
overcast-pinpoint (peak search) or overcast-presence-window for recurring or
interval events. Needs the video local.
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.
- 7d ago First seen · 66 lines · 43 tokens per session scan A 7ebe9835ac26
overcast-event-bisect is a skill published in the GitHub repository kdr/overcast (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 43 tokens to every session and 646 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.
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