synthesis-agent-guardrails skillA
synthesis-agent-guardrails is agent-read markdown (skill) from synthesisengineering/synthesis-skills: Fail-closed session and tool guards for agent harnesses: cross-account artifact routing and publication authority today; output detectors landing next. Every guard ships inert until its principal configures it..
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# Synthesis Agent Guardrails ## The Problem Agent harnesses act through the principal's accounts: calendar invites go out as someone, drafts send from somewhere. A routing rule written in the workspace instructions is necessary and demonstrably insufficient — rules sitting on disk go unread at the moment of acting, and an invitation cannot be unsent. The controls that prevent cross-account mistakes have to sit *before* the tool call, not after it. ## The Guards ### Account routing gate (`guards/account_routing_guard.py`) A fail-closed PreToolUse gate on cross-account artifact creation. When the session's working directory is inside a configured workspace, a tool call that creates or mutates an outward-facing artifact through a connector NOT bound to that workspace's account is blocked (exit 2 with an explanation); everything else passes (exit 0). Gated surface, matched on the tool name's terminal segment exactly: - Google-mutating terminals unconditionally (`create_event`, `send_email`, `reply`, sharing verbs, and the rest — see `MUTATING_TOOLS`). - Shared terminals (`send_message`) only when the payload proves the call …
Read the whole file at its exact version.
How to install
mdr add synthesisengineering/synthesis-skills/synthesis-agent-guardrails@v1.0.0mdr add synthesisengineering/synthesis-skills/synthesis-agent-guardrails@sha256:eb6b732a76a30f7ePin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_3f25egobi3q4fldb)
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Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.0.0 latest | 2026-09-23 | 449388e | 6,349 B | A | view · diff |
| v1.0.0 | 2026-09-23 | aa168e8 | 5,602 B | A | view · diff |
| v1.0.0 | 2026-09-22 | 0193400 | 3,683 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6349 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
synthesisengineering/synthesis-skills · 19 stars · license Apache-2.0 · pushed 2026-09-23 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_3f25egobi3q4fldb GET https://markdownregistry.com/api/v1/resolve?ref=synthesisengineering/synthesis-skills/synthesis-agent-guardrails GET https://markdownregistry.com/api/v1/blob/eb6b732a76a30f7ee766fd2111d4f0380aefd1eced106728c95df9f4fcbb8ae1
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