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Agent skill

Advice Provider Hygiene

by 0xMiden in 0xMiden/protocol

A skill your agent uses when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data.

MITAuto-check passedDevelopment

Install Advice Provider Hygiene

skills CLI
$ npx skills add 0xMiden/protocol --skill advice-provider-hygiene -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install 0xMiden/protocol advice-provider-hygiene --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/0xMiden/protocol.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/advice-provider-hygiene .claude/skills/advice-provider-hygiene && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
advice-provider-hygiene
GitHub stars
133
Token cost
~1.1k tokens
SKILL.md length
418 words
Files
1
Skills in repo
35
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data.

  • Works in 3 steps: Validate advice data against a commitment → Key advice map entries by content hash → Missing advice is an error
  • Note MASM code that reads from
  • SKILL.md covers Rules, Why and Examples
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Advice Provider Hygiene is an agent skill from 0xMiden/protocol. Use when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data.

Its SKILL.md is about 1.1k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: Core components of the Miden protocol. The licence is MIT.

When your agent uses it

  • Note MASM code that reads from
  • Writes to the advice provider (advice stack / advice map) — validate advice data

Example prompts

  • “/advice-provider-hygiene”

Workflow steps

3 steps, taken from the step headings in SKILL.md.

  1. Validate advice data against a commitment
  2. Key advice map entries by content hash
  3. Missing advice is an error

What it can do on your machine

Read from SKILL.md and the folder at commit 62b59ec. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are masm).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Advice Provider Hygiene loads about 1.1k tokens when it runs. Until then it costs about 44 tokens; SKILL.md has 418 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~44
When it runs · the whole SKILL.md, loaded when a task matches
~1.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from 0xMiden/protocol at commit 62b59ec, republished under its MIT licence (© 0xMiden). 418 words, ~1,148 tokens.

Download SKILL.mdSave it as .claude/skills/advice-provider-hygiene/SKILL.md (or your agent's skills folder).
name
advice-provider-hygiene
description
Use when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data.

Advice Provider Hygiene

Rules

The advice provider is untrusted input supplied by the (potentially adversarial) prover. Any kernel, account, or note procedure that touches it must follow three rules.

1. Validate advice data against a commitment

Before consuming data loaded from the advice provider:

  1. Read the data from the advice stack / advice map into memory.
  2. Compute its hash with Poseidon2 over the loaded region.
  3. Assert the computed hash equals an expected commitment that the kernel already trusts — on-chain storage, a prior input, or a value already on the stack.

Do not consume advice data before this check passes. The advice provider's only role is to supply witness data for commitments the kernel has already received.

2. Key advice map entries by content hash

When inserting into the advice map, the key must be a hash of the value it indexes (or a derived commitment of the same data):

  • Use Poseidon2(value) (or whichever commitment matches the consumer's check) as the key.
  • Do not hard-code keys like 0x0000_0000_0000_0001, ADVICE_KEY_NOTE_DATA, or per-procedure magic constants.

Readers retrieve the entry by recomputing the same hash from data they already trust; rule 1's commitment check binds the lookup result to that trusted hash.

3. Missing advice is an error

A missing advice-map entry, an empty advice stack, or an absent required value is an error — not a default. Surface it with assert.err=ERR_.... Don't substitute zero / empty / a fallback and continue.

Show full SKILL.md (181 more words)Show less

Why

The advice provider is filled by a potentially adversarial prover. Validating every value against a commitment the kernel already trusts, keying map entries by content hash, and erroring on missing entries are what stop untrusted advice from silently corrupting the kernel's invariants.

Examples

Advice data is tied to a commitment by piping it into memory. There are two mechanisms, and they differ in whether the commitment check happens for you.

Piping words to memory — you must validate

adv_pipe, adv_loadw, and mem::pipe_double_words_to_memory copy advice data into memory but do not check it against any commitment. Hash the loaded region with Poseidon2 yourself and assert it equals a commitment the kernel already trusts.

masm
# Good: pipe words while hashing, then assert against the trusted commitment
# (permute rounds abbreviated; the real path pipes the full region before squeezing)
exec.poseidon2::init_no_padding
adv_pipe exec.poseidon2::permute
# ... one permute per piped block ...
exec.poseidon2::squeeze_digest
# => [COMPUTED_COMMITMENT, ...]
exec.memory::get_ref_block_commitment
assert_eqw.err=ERR_PROLOGUE_GLOBAL_INPUTS_PROVIDED_DO_NOT_MATCH_BLOCK_COMMITMENT

# Good: pipe double words while hashing, then assert against the provided commitment
exec.poseidon2::init_no_padding
exec.mem::pipe_double_words_to_memory
exec.poseidon2::squeeze_digest
# => [COMPUTED_ASSETS_COMMITMENT, ...]
exec.memory::get_input_note_assets_commitment
assert_eqw.err=ERR_PROLOGUE_PROVIDED_INPUT_ASSETS_INFO_DOES_NOT_MATCH_ITS_COMMITMENT

# Bad: pipe advice into memory and use it without the hash/assert step
adv_pipe
# ... data could be anything the prover supplied
Piping a preimage to memory — validated for you

mem::pipe_preimage_to_memory takes the commitment on the stack, copies the preimage from the advice stack into memory, and asserts its sequential Poseidon2 hash equals that commitment — all in one step.

masm
# Good: data is checked against COMMITMENT as part of the pipe
# stack: [num_words, write_ptr, COMMITMENT]
exec.mem::pipe_preimage_to_memory
# => [write_ptr'] — data in memory is guaranteed to match COMMITMENT
Content-addressed keys and missing entries

Illustrative fragments (with the key already on the operand stack):

masm
# Good: key the advice map entry by the commitment itself
push.NOTE_DATA_COMMITMENT
adv.push_mapval

# Bad: hard-coded magic key
push.0x1234_5678_0000_0001
adv.push_mapval

# Good: move the advice-stack presence flag before asserting it
adv.has_mapkey
adv_push
assert.err=ERR_MISSING_REQUIRED_ADVICE

# A direct lookup also errors if the key is absent; it never substitutes a default
adv.push_mapval

For the Rust analog (returning Err on bad/missing external input rather than panicking or defaulting), see return-error-not-panic.

© 0xMiden, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .claude/skills/advice-provider-hygiene of 0xMiden/protocol.

Open the folder on GitHubat commit 62b59ec

Compare with similar skills

Advice Provider Hygiene next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Advice Provider Hygiene compared with similar skills
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Advice Provider Hygiene this skill0xMiden/protocol133—~1.1kAutomated safety check: PassMIT
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
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PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k4 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Advice Provider Hygiene

What does Advice Provider Hygiene do?

A skill your agent uses when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data. Advice Provider Hygiene is an agent skill from 0xMiden/protocol. Use when writing kernel, account, or note MASM code that reads from or writes to the advice provider (advice stack / advice map) — validate advice data.

When should I use Advice Provider Hygiene?

Advice Provider Hygiene fits situations like: note MASM code that reads from; writes to the advice provider (advice stack / advice map) — validate advice data.

How do I install Advice Provider Hygiene in Claude Code?

Run `npx skills add 0xMiden/protocol --skill advice-provider-hygiene -a claude-code`. Or copy the skill folder (.claude/skills/advice-provider-hygiene in 0xMiden/protocol) into .claude/skills/advice-provider-hygiene in your project. Claude Code loads it when a task matches its description.

How do I install Advice Provider Hygiene in Codex?

Run `npx skills add 0xMiden/protocol --skill advice-provider-hygiene -a codex`. Or copy the skill folder (.claude/skills/advice-provider-hygiene in 0xMiden/protocol) into .agents/skills/advice-provider-hygiene in your project. Codex loads it when a task matches its description.

Can I use Advice Provider Hygiene in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add 0xMiden/protocol --skill advice-provider-hygiene -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/advice-provider-hygiene, .gemini/skills/advice-provider-hygiene, .github/skills/advice-provider-hygiene and .opencode/skills/advice-provider-hygiene in your project.

What does Advice Provider Hygiene need to run?

SKILL.md names no scripts, command-line tools or credentials: Advice Provider Hygiene is instructions for the agent only.

Does Advice Provider Hygiene access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Advice Provider Hygiene safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Advice Provider Hygiene use?

Advice Provider Hygiene is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Advice Provider Hygiene use?

About 1.1k tokens (SKILL.md is roughly 4.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Advice Provider Hygiene?

Skills that share tags, products or a category with Advice Provider Hygiene: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Advice Provider Hygiene?

0xMiden (a GitHub organization) maintains it in 0xMiden/protocol, which has 133 GitHub stars. The repository holds 35 skills in this directory. The repository was last updated on October 9, 2026.

Source: 0xMiden/protocol on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.