deciduous: Skill for OpenCode

.opencode/skills/archaeology/SKILL.md

archaeology is a skill for OpenCode from notactuallytreyanastasio/deciduous. It costs 12 tokens per session (686 once invoked), scanned A, original, Apache-2.0.

A migration tool that turns written project history into a queryable decision graph, meaning a connected record that can be searched and followed.

In plain words
What is it for?
Use it to import narratives, create dated goals and decisions, record pivots when an approach changes, and connect related project histories.
Why use it?
It makes past approaches, discoveries, failures, and changes easier to understand and relate to one another.

Skill for OpenCode

Written for OpenCode: installed under .opencode/. Also seen: mentions OpenCode.

This is notactuallytreyanastasio/deciduous's own configuration. It tells OpenCode how to work on deciduous itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything deciduous configures →

Reuse

Borrowing it

Nothing to install: this file belongs to notactuallytreyanastasio/deciduous. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/notactuallytreyanastasio/deciduous/main/.opencode/skills/archaeology/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/notactuallytreyanastasio/deciduous

Made for: OpenCode.

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 archaeology

README.md
[![agentmods](https://agentmods.dev/badge/skills/notactuallytreyanastasio/deciduous/archaeology/github.svg)](https://agentmods.dev/skills/notactuallytreyanastasio/deciduous/archaeology)
Your own site
<a href="https://agentmods.dev/skills/notactuallytreyanastasio/deciduous/archaeology"><img src="https://agentmods.dev/badge/skills/notactuallytreyanastasio/deciduous/archaeology/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.

agentmods 80×15 button for archaeology

Your own site · 80×15
<a href="https://agentmods.dev/skills/notactuallytreyanastasio/deciduous/archaeology"><img src="https://agentmods.dev/badge/skills/notactuallytreyanastasio/deciduous/archaeology.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 12 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 686 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00012 $0.00686
Opus 5 $0.00006 $0.00343
Sonnet 5 $0.00002 $0.00137
Haiku 4.5 $0.00001 $0.00069

Measured 9d ago against content hash 8c1dcefbf38e, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

archaeology 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 9d 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.

.opencode/skills/archaeology/SKILL.md · 125 lines

How it starts

The opening of the file, as written. The whole thing — 125 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Archaeology

Transform narratives into a queryable decision graph.

Run /narratives first to create .deciduous/narratives.md.

Step 1: Read the narratives

deciduous narratives show

For each narrative, you'll create a subgraph.

Step 2: Create root goals

For each narrative, create a backdated goal:

deciduous add goal "<Narrative title>" -c 90 --date "YYYY-MM-DD"

Step 3: Build initial approaches

deciduous add decision "<First approach>" -c 85 --date "YYYY-MM-DD"
deciduous link <goal> <decision> -r "Initial design"

Step 4: Create pivots with archaeology pivot

For each PIVOT in a narrative, use the atomic pivot command:

deciduous archaeology pivot <from_id> "<what was learned>" "<new approach>" -c 85 -r "<why it failed>"

This automatically creates:

  • observation node (what was learned)
  • revisit node (reconsidering the old approach)
  • decision node (the new approach)
  • All 3 linking edges
  • Marks the old approach as superseded

Preview before executing:

deciduous archaeology pivot <from_id> "observation" "new approach" --dry-run

Step 5: Connect narratives

When narratives reference each other:

deciduous link <auth_observation> <ratelimit_decision> \
  -r "Auth failures drove rate limit redesign"

Step 6: Mark superseded paths

For nodes that were replaced but not part of a pivot:

# Single node
deciduous archaeology supersede <id>

# Node and all descendants
deciduous archaeology supersede <id> --cascade

Step 7: Review the timeline

# See all nodes chronologically
deciduous archaeology timeline

# Filter by type
deciduous archaeology timeline --type revisit

# See existing pivot chains
deciduous narratives pivots

# Visual exploration
deciduous serve

Attach Evidence Documents

If you find diagrams, screenshots, or specs that support the archaeology:

deciduous doc attach <goal_id> evidence/old-architecture.png -d "Architecture before refactor"
deciduous doc attach <revisit_id> evidence/perf-report.pdf --ai-describe

Read the full file on GitHub · 125 lines

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. 9d ago First seen · 125 lines · 12 tokens per session scan A 8c1dcefbf38e

Subscribe to this mod's changes

archaeology is a skill published in the GitHub repository notactuallytreyanastasio/deciduous (159 stars, last pushed 4d ago), licensed Apache-2.0. It adds 12 tokens to every session and 686 once invoked, about $0.0001 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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