Sepia
De-AI writing skill for any Agent Skills-compatible agent (77+ via the Skills CLI), with native plugins for Claude Code, Codex, Grok Build, and Antigravity. Narrative-architecture repair for fiction, venue-matched rules for professional prose. Based on StoryScope (arXiv:2604.03136).
Is Sepia safe? Promising trust profile, but some evidence still deserves review.
Compare Sepia
How does it stack up against its Agent Skills neighbours?
Pick any agent to compare →In detail: Sepia scores 56.6/100 (Grade C), ranked #155 of 385 tracked open-source AI agent projects, on evidence coverage C (2 of 5 independent signal types). The public evidence: no package-provenance attestation found; OSSF Scorecard rates its supply-chain practices 4.7/10; 28% of recent commits are signed; last pushed 2026-10-15. Every point is earned from checkable signals — never paid placement. How scoring works →
How Sepia could raise its score
Each line changes one public signal and recomputes with the live scoring function. The gains don't add up exactly, because the score is capped near the top.
- Raise the OSSF Scorecard from 4.7 to 9.0lowest checks: CII-Best-Practices 0, Code-Review 0, Dependency-Update-Tool 0 +9.0 → 65.6 B · #55 of 385
- Sign every commit28% signed today +3.6 → 60.2 C · #105 of 385
Chain of custody
Scanners check what the code says. This traces who ships Sepia and whether that has changed: from the source repository, through how changes are reviewed and released, to the code you run. These are the checks for OWASP ASI04 Agentic Supply Chain Vulnerabilities and, for skills, AST02 Supply Chain Compromise.
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Source Partly signed
github.com/Nanako0129/sepia, MIT, last pushed 2026-10-15. 28% of the last 100 commits carry a verified signature; the rest can't be tied to a verified identity.
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Review and release Mixed
OpenSSF Scorecard rates the repository's practices 4.7/10 (scanned Oct 18, 2026). The checks that decide who can get a change released:
- Code Review0
- Branch Protection3
- Signed Releasesn/a
- Dangerous Workflow10
- Token Permissions10
- Pinned Dependencies6
All 18 Scorecard checks
Binary-Artifacts 10Branch-Protection 3CI-Tests 10CII-Best-Practices 0Code-Review 0Contributors 3Dangerous-Workflow 10Dependency-Update-Tool 0Fuzzing 0License 10Maintained 0Packaging -1Pinned-Dependencies 6SAST 0Security-Policy 0Signed-Releases -1Token-Permissions 10Vulnerabilities 10 -
Published packages None
No registry package. Sepia is used from its repository, so what you run is whatever you check out: pin a release tag or commit.
Changes to this chain
- 2026-09-10 OSSF Scorecard: 4.7/10
Evidence behind this score
Coverage C: 2 of 5 independent evidence types found.
- GitHub repository data
- Package downloads (missing)
- Supply-chain checks
- Public actions (missing)
- Community mentions (missing)
Verify this score yourself
Every build re-issues Sepia’s score as an Ed25519-signed credential, valid for 7 days. You can check it offline against HVTracker’s published key; if anyone changes a number after signing, verification fails.
What this score doesn’t check
It covers who ships the code, not what the code does. It doesn’t read the skill’s instructions for injected instructions, watch runtime behaviour, or find bugs nobody has disclosed yet. For that, run a content scanner before you install it, such as Cisco Skill Scanner.
How Sepia compares in Agent Skills
- #153 Understand Anything 56.7 +0.1
- #154 Okf Skills 56.6 ±0
- #155 Sepia 56.6 this agent
- #156 HelloAgents 56.6 ±0
- #157 Md2Wechat Skill 56.5 −0.1
Bars show each HVTrust score; the tick marks Sepia’s 56.6.
Where the 56.6 comes from
HVTrust dimensions vs the Agent Skills average
56.6 / 100 · 100.0% confidenceSepia Agent Skills average (385 agents)
Quick Trust Read
How to read this: HVTrust (0–100) weighs supply-chain signals (provenance, OSSF Scorecard, signed commits, open license) alongside real-world adoption. Grade C reflects the trust score band: A ≥ 80, B ≥ 65, C ≥ 50, D < 50. Evidence coverage C is separate — it grades how many independent signal types back the score (2 of 5), so a high score on thin evidence stays visible. Full methodology →
Rank Trend
Activity & Reach
Analysis
Activity Inputs
75.6 / 100Common questions about Sepia
Does Sepia publish package provenance?
Does Sepia have an OpenSSF Scorecard?
Is Sepia actively maintained?
What license does Sepia use?
Are Sepia's commits signed?
Not a safety endorsement. HVTracker describes what public signals show, not whether a project is safe for your use case. Run your own security review before adopting in production.
AI agent surface
MCP, providers, tool surface
These runtime-trust fields — detected from public repo docs and manifests — contribute a bounded adjustment to this project's HVTrust score alongside supply-chain evidence. The exact values each field can add or subtract are documented in the methodology → Compare this surface across every listed agent in the capability matrix →
- MCP signal live
- External deps live
- Tool / plugin surface live
- Package provenance drift live
Detected changes to Sepia's runtime surface and supply-chain posture, from daily public-signal snapshots. A change here means our detectors see something different — a genuinely changed capability, or better evidence of an existing one.
Maintain Sepia?
For maintainers
HVTrust scores Sepia from public signals only — we never contact maintainers first. If a signal is wrong, stale, or missing (provenance you publish, a Scorecard you run, signed releases), tell us and we'll review it. Corrections are public and tracked on GitHub.
Reputation Timeline
Signal history
Embed Badge Badge guide for maintainers →
For maintainers
[](https://hvtracker.net/agents/sepia)
<a href="https://hvtracker.net/agents/sepia"><img src="https://hvtracker.net/badge/sepia.svg" alt="HVTrust"></a>
Other agents in Agent Skills
GitHub REST API (repo, commits, stars, forks, license) · OpenSSF Scorecard CLI
Each agent's signals refresh once daily across 6 staggered batches. Methodology v4.4 · Raw JSON