What is mastermind-secrets?

A local bookkeeping tool for recording an organization's secret names and masked references, such as API key names. It does not give those secret values to agents or the runtime, and it is not a security enforcement system.

Use it to set, list, rotate, revoke, or audit locally recorded secrets for an organization.

It keeps secret records out of ordinary project files and prevents the tool from printing or committing secret values. It also makes clear that storing a record here does not make a secret usable by the runtime.

mastermind-secrets — Skill for Claude Code and Codex by monoes

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 monoes/monomind --skill mastermind-secrets

Clone the repo

git clone --depth 1 https://github.com/monoes/monomind

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/monoes/monomind/mastermind-secrets/github.svg)](https://agentmods.dev/skills/monoes/monomind/mastermind-secrets)

Your own site

<a href="https://agentmods.dev/skills/monoes/monomind/mastermind-secrets"><img src="https://agentmods.dev/badge/skills/monoes/monomind/mastermind-secrets/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/monoes/monomind/mastermind-secrets"><img src="https://agentmods.dev/badge/skills/monoes/monomind/mastermind-secrets.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 41 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,755 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 2 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	$0.00041	$0.01755
Opus 5.5	$0.00016	$0.00702
Sonnet 5.5	$0.00008	$0.00351
Haiku 4.5	$0.00004	$0.00176

Measured 2d ago against content hash 0ff1f5828c3f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mastermind-secrets scanned grade A with 2 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 2d 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.

Asks for rootlowPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

- `local`: `.monomind/orgs/.secrets/<org_name>/<name>` (chmod 600, gitignored)

Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

curl -H "Authorization: Bearer $secret" ...

.agents/skills/mastermind-secrets/SKILL.md · 203 lines

How it starts

The opening of the file, as written. The whole thing — 203 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Mastermind Secrets

This skill is invoked directly via /mastermind-secrets.

Bookkeeping only — not enforced by the Org Runtime. It writes .monomind/orgs/<org>-secrets.json and .monomind/orgs/.secrets/<org>/, which no runtime code reads: org agents never receive these values.

Inputs

brain_context: BRAIN CONTEXT block
org_name: org to manage secrets for
action: list | set | rotate | revoke | audit
secret_name: name/key of the secret (e.g. OPENAI_API_KEY, SLACK_WEBHOOK)
secret_value: value to store (only ever passed as env var reference, NEVER hardcoded)
provider: local | env | vault (default: local)
caller: command | master

Step 0 — Brain Load (standalone only)

If caller is not "command", load brain context following mastermind-protocol/SKILL.md Brain Load Procedure with namespace: ops.

SECURITY RULES (always enforced)

NEVER print secret values to stdout
NEVER store secret values in state files (store only masked references: sk-ant-***...***)
NEVER commit secrets to git
Secrets passed as secret_value MUST come from env vars ($MY_KEY), NOT inline strings

Step 1 — Load Secrets Registry

The secrets registry stores metadata only (name, provider, masked hint, rotation date):

secretsFile=".monomind/orgs/${org_name}-secrets.json"
[ ! -f "$secretsFile" ] && echo '{"secrets":[]}' > "$secretsFile"

Actual secret values live in:

local: .monomind/orgs/.secrets/<org_name>/<name> (chmod 600, gitignored)
env: environment variable ORG_<ORG_NAME_UPPER>_<SECRET_NAME_UPPER>

Step 2 — Execute Action

list (default)

Show all registered secrets for this org (metadata only, masked values):

jq -r '
  (.secrets // [])[] |
  "[\(.name)]  provider=\(.provider)  hint=\(.masked_hint // "***")  set=\(.set_at // "unknown")  rotated=\(.rotated_at // "never")"
' "$secretsFile" 2>/dev/null || echo "No secrets registered."

Render as:

SECRETS — org: <org_name>
──────────────────────────────────────────────
NAME                  PROVIDER   VALUE HINT       SET               ROTATED
ANTHROPIC_API_KEY     local      sk-ant-***...    2 days ago        —
SLACK_WEBHOOK         env        https://hooks    1 week ago        —
GITHUB_TOKEN          local      ghp_***...       3 days ago        1 day ago

Read the full file on GitHub · 203 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.

2d ago First seen · 203 lines · 41 tokens per session scan A 0ff1f5828c3f

Subscribe to this mod's changes

mastermind-secrets is a skill published in the GitHub repository monoes/monomind (23 stars, last pushed 2d ago), licensed Apache-2.0. It adds 41 tokens to every session and 1,755 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 2 findings (asks for root, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-26.

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mastermind-secrets