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costory-finops-mcp-skills: Instructions file for Claude Code

AGENTS.md

costory-finops-mcp-skills AGENTS.md is an instructions file for Claude Code, Codex, OpenCode from costory-io/costory-finops-mcp-skills. It costs 1,621 tokens per session, scanned A, original, Apache-2.0.

A set of repository instructions for AI coding agents working on Costory FinOps MCP skills. FinOps means managing and understanding cloud or software costs.

In plain words
What is it for?
Use it when changing or adding Costory skills, plugins, manifests, or the skills.json index. It describes the expected marketplace and per-plugin layout.
Why use it?
It prevents agents from placing files in the wrong directories or using an unsupported plugin structure. It also documents how skill identifiers map to files.

Instructions file for Claude CodeCodexOpenCode

Written for Claude Code and Codex and OpenCode: ${CLAUDE_PLUGIN_ROOT} variable, but also the file is AGENTS.md. Also seen: positional $N argument; mentions Claude Code; mentions AGENTS.md.

This is costory-io/costory-finops-mcp-skills's own configuration. It tells Claude Code, Codex and OpenCode how to work on costory-finops-mcp-skills 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 costory-finops-mcp-skills configures →

Runs only inside a plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else, and the catalogue could not identify which plugin ships it.

not rated 2repo +1 changed yesterday A scan 1,621 tokens original Apache-2.0
View source ↗ costory-io/costory-finops-mcp-skills costory.io
Reuse

Borrowing it

Nothing to install: this file belongs to costory-io/costory-finops-mcp-skills. 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/costory-io/costory-finops-mcp-skills/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/costory-io/costory-finops-mcp-skills

Made for: Claude Code, Codex, OpenCode.

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Per session 1,621 This file is loaded in full into every session.
When invoked 1,621 The same file — it is already loaded in full.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01621 $0.01621
Opus 5 $0.00811 $0.00811
Sonnet 5 $0.00324 $0.00324
Haiku 4.5 $0.00162 $0.00162

Measured yesterday against content hash 195d611c1f64, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

costory-finops-mcp-skills AGENTS.md 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 yesterday.

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.

AGENTS.md · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

AGENTS.md — Conventions for AI Coding Agents in This Repo

This repo distributes one plugin, costory, from a single marketplace using the canonical Anthropic per-plugin subdirectory layout (same pattern as tsuga-dev/agent-plugins). Skills teach agents how to use Costory MCP tools for FinOps workflows.

Layout

.claude-plugin/marketplace.json            ← marketplace listing; each plugin points to its own subdir via source
skills.json                                ← Costory MCP skillId → SKILL.md path index (for get_skill)
plugins/costory/
  .claude-plugin/plugin.json               ← per-plugin manifest
  skills/<skill-name>/SKILL.md             ← skills auto-discovered by Claude Code / Codex

Notes:

  • No top-level skills/ directory. Every skill lives under plugins/costory/skills/.
  • No .codex-plugin/ directory. Codex consumes the same .claude-plugin/marketplace.json.
  • No skills[] array in marketplace.json. Skills are auto-discovered from the plugin's skills/ directory.
  • skills.json maps Costory MCP skillId values (bigquery, virtual-dimensions, dashboards, reports, query, recipes) to on-disk paths so the backend can load markdown without hardcoding content.

Skill ID mapping (Costory MCP)

skillId, folder name, and frontmatter name are the same kebab-case token:

MCP skillId
bigquery
virtual-dimensions
dashboards
reports
query
recipes

When Costory get_skill is wired to this repo, resolve via skills.json. Return the body of SKILL.md (optionally strip YAML frontmatter).

When changing a skill

  1. Edit plugins/costory/skills/<skill>/SKILL.md (or files under its references/).
  2. Bump versions in lockstep. Three places:
    • .claude-plugin/marketplace.json → metadata.version
    • plugins/costory/.claude-plugin/plugin.json → version
    • skills.json → version

Read the full file on GitHub · 133 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. yesterday Changed · +1 lines · +10 tokens per session 195d611c1f64
  2. 11d ago First seen · 132 lines · 1,611 tokens per session scan A dffa4ea052de

Subscribe to this mod's changes

costory-finops-mcp-skills AGENTS.md is an instructions file published in the GitHub repository costory-io/costory-finops-mcp-skills (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 1,621 tokens to every session, about $0.0081 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.

automationawscloud-costfinopsfinops-mcpgcp
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