A process for turning recurring failures found in a Git history review into reusable practice skills. It reads an incident file and writes team-independent SKILL.md and plugin.json files.

Use it after mining a repository's history for incident clusters, when _analysis/incidents.md is ready to promote into reusable skills.

It preserves lessons from past incidents so the same failure patterns can become repeatable guidance for future work.

synthesize — Skill for Claude Code and Codex by ProsusAI/prism

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.

Any agent

npx skills add ProsusAI/prism --skill synthesize

Clone the repo

git clone --depth 1 https://github.com/ProsusAI/prism

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/prosusai/prism/synthesize/github.svg)](https://agentmods.dev/skills/prosusai/prism/synthesize)

Your own site

<a href="https://agentmods.dev/skills/prosusai/prism/synthesize"><img src="https://agentmods.dev/badge/skills/prosusai/prism/synthesize/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/prosusai/prism/synthesize"><img src="https://agentmods.dev/badge/skills/prosusai/prism/synthesize.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 77 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 2,530 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00077	$0.02530
Opus 5.5	$0.00031	$0.01012
Sonnet 5.5	$0.00015	$0.00506
Haiku 4.5	$0.00008	$0.00253

Measured 2mo ago against content hash 3950a4d0dccb, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

synthesize 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 2mo 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.

skills/synthesize/SKILL.md · 267 lines

How it starts

The opening of the file, as written. The whole thing — 267 lines — stays where its author put it; the contents beside it link to each section on GitHub.

When to use this skill

Promote qualifying Type 2 seed clusters from _analysis/incidents.md into practice skills. Writes _analysis/extracted_skills_history/{name}/SKILL.md and _analysis/extracted_skills_history/{name}/plugin.json in the current repo with all team-specific details stripped.

Step 1 — Read incidents.md

Read _analysis/incidents.md. This is the required input.

If it doesn't exist, stop and tell the developer:

"_analysis/incidents.md not found. Run /mine-history (Claude Code) or @mine-history (Cursor) first to extract incident clusters from your git history."

Read the file fully. Note each cluster: its name, the directives/findings listed, their dates, and its current status line.

Also check for _analysis/design.md. If it exists, read it fully. Note all findings — both [technology]-tagged and [codebase]-tagged — recording each one's subsystem, category (decision / non-obvious behavior / structural anti-pattern), and the technology or pattern it concerns. Do not skip [codebase]-tagged findings at this stage. If design.md doesn't exist, continue without it.

Pay particular attention to the ## Architectural patterns section of design.md, if present. These are pre-assembled cross-subsystem patterns from Phase 3c of /mine-design (Claude Code) or @mine-design (Cursor). Treat them as first-class candidates with their own promotion path and key-decisions output format (see Step 3 and Step 5).

Individual design seeds that don't reach the assembled-pattern threshold may be better candidates for /synthesize-decisions (Claude Code) or @synthesize-decisions (Cursor). Flag them as such rather than marking them "too thin".

Step 2 — Auto-discover supplementary docs

Without asking the developer, look for documentation that might contain additional failure modes or lessons learned:

ls docs/ 2>/dev/null
ls adr/ 2>/dev/null
ls decisions/ 2>/dev/null
find . -name "ADR*.md" -not -path "*/node_modules/*" 2>/dev/null | head -10
find . -name "ARCHITECTURE*.md" -not -path "*/node_modules/*" 2>/dev/null | head -5
find . -name "CONTRIBUTING*.md" -not -path "*/node_modules/*" 2>/dev/null | head -5
cat CLAUDE.md 2>/dev/null

Read the full file on GitHub · 267 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.

2mo ago First seen · 267 lines · 77 tokens per session scan A 3950a4d0dccb

Subscribe to this mod's changes

synthesize is a skill published in the GitHub repository ProsusAI/prism (20 stars, last pushed 4mo ago), licensed Apache-2.0. It adds 77 tokens to every session and 2,530 once invoked, about $0.0003 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.

Building agents Git and workflow

synthesize next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
synthesizeProsusAI/prism	Skill	20	4mo ago	Apache-2.0	A	77	Claude Code, Codex
merge-batchdiegosouzapw/OmniRoute	Skill	83k	5d ago	MIT	A	46	Claude Code
prowler-commitprowler-cloud/prowler	Skill	15k	yesterday	Apache-2.0	A	44	Claude Code, Codex
gh-auth-isolationgithub/gh-aw	Skill	5.6k	yesterday	MIT	A	20	Claude Code, Codex
github-skillzeenie-ai/OpenCompany	Skill	1.1k	yesterday	MIT	A	51	Claude Code
comet-githubrpamis/comet	Skill	3.3k	yesterday	MIT	A	72	Claude Code, Codex
release-helperSahir619/fable-method	Skill	2.3k	1mo ago	MIT	A	43	Claude Code