usage-control-policy SKILL.md skillA
usage-control-policy from sparq-org/sparq is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sparq-org/sparq/usage-control-policy@git:20261102.d1aab55Pins git:20261102.d1aab55 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sparq-org/sparq
- Path
skills/usage-control-policy/SKILL.md- Versions recorded
- 19
- Latest version
- git:20261102.d1aab55, committed Nov 2, 2026
- First version recorded
- Jul 26, 2026
- Size
- 78,718 bytes
- Repository stars
- 13
- License
- MIT
Evaluate W3C ODRL 2.2 usage-control policies over RDF with the opt-in sparq-policy crate — parse an ODRL Set/Offer/Agreement into a typed Policy of Permission/Prohibition rules (action, target, assignee, Constraint, Duty), then evaluate an access Request to a fail-closed ALLOW/DENY Decision. Use when gating a query/asset by purpose, recipient, time window, count, or a duty obligation; when mapping ODRL to the sparq-solid WAC/ACP allow-deny model; or when wiring usage control above access…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# usage-control-policy
`sparq-policy` is the declarative **usage-control** layer above access control. Where `sparq-solid` answers "may this agent **read** graph G?", `sparq-policy` answers "may this party **use** this asset *for purpose P, with obligation O, until time T, disclosing only to recipient R*?" — by evaluating a [W3C ODRL 2.2](https://www.w3.org/TR/odrl-model/) policy.
It parses an ODRL policy from RDF into a typed model (`Policy → {permissions, prohibitions}`, each `Rule` carrying an `Action`, `target`, `assignee`/`assigner`, `Constraint`s and `Duty`s) and evaluates an access `Request` to a **fail-closed** `Decision { allow, matched_rules, unmet_constraints, permit }` through the one decision point `decide` (`evaluate` is the same function). This is the **single-node base case**: ODRL over one node's data, reducing to the same allow/deny shape `sparq-solid` enforces.
…Read the whole file at its exact version.
How to install
mdr add sparq-org/sparq/usage-control-policy@sha256:7da0e2bb36e85a88The line at the top of this page pins the label git:20261102.d1aab55, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_lkrvprhkguyzticf)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 19 versions of this file, between Jul 26, 2026 and Nov 2, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261102.d1aab55 latest | 2026-11-02 | d1aab55 | 78,718 B | A | view · diff |
| git:20261026.6e0be1d | 2026-10-26 | 6e0be1d | 79,883 B | A | view · diff |
| git:20261018.e516b76 | 2026-10-18 | e516b76 | 79,355 B | A | view · diff |
| git:20261014.accb95c | 2026-10-14 | accb95c | 77,388 B | A | view · diff |
| git:20261014.c073170 | 2026-10-14 | c073170 | 77,038 B | A | view · diff |
| git:20261014.e52cc09 | 2026-10-14 | e52cc09 | 75,443 B | A | view · diff |
| git:20261014.fec1e37 | 2026-10-14 | fec1e37 | 74,714 B | A | view · diff |
| git:20261014.bbe532f | 2026-10-14 | bbe532f | 74,042 B | A | view · diff |
| git:20261014.46ff75d | 2026-10-14 | 46ff75d | 71,507 B | A | view · diff |
| git:20261009.facfe78 | 2026-10-09 | facfe78 | 70,445 B | A | view · diff |
| git:20261009.221b433 | 2026-10-09 | 221b433 | 69,780 B | A | view · diff |
| git:20261009.573577a | 2026-10-09 | 573577a | 66,880 B | A | view · diff |
| git:20261009.f0b870d | 2026-10-09 | f0b870d | 76,550 B | A | view · diff |
| git:20261005.6c7c3a3 | 2026-10-05 | 6c7c3a3 | 77,118 B | A | view · diff |
| git:20260903.1a63aa7 | 2026-09-03 | 1a63aa7 | 76,737 B | A | view · diff |
| git:20260802.ba56746 | 2026-08-02 | ba56746 | 76,733 B | A | view · diff |
| git:20260726.cdecad0 | 2026-07-26 | cdecad0 | 71,445 B | A | view · diff |
| git:20260726.b3ecbc4 | 2026-07-26 | b3ecbc4 | 70,636 B | A | view · diff |
| git:20260726.785edb1 | 2026-07-26 | 785edb1 | 69,972 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 (78718 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
sparq-org/sparq · 13 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lkrvprhkguyzticf GET https://markdownregistry.com/api/v1/resolve?ref=sparq-org/sparq/usage-control-policy GET https://markdownregistry.com/api/v1/blob/7da0e2bb36e85a884605dc2c10110dde18241bdee7633bf584c1ab5623cab5cc
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.