---
name: owasp-agentic-review
description: OWASP-mapped agentic security review — prompt injection, tool poisoning, identity, excessive agency, credential exposure, supply-chain, insecure output handling, overreliance, data leakage, insecure plugin/MCP design. Evidence-cited, severity-ranked.
origin:
  type: first-party
---

# OWASP Agentic Review — Prompt Injection, Tool Poisoning, Agency & Supply Chain

Curated OWASP LLM Top 10 (2025) + OWASP Agentic Security review for **agents, skills, plugins, hooks, MCP, tool use, prompt handling, and provenance**. Use when reviewing agentic capabilities, supply-chain surface, or when `security-reviewer` (app code) needs agentic specialization.

**Evidence-cited, severity-ranked — do not hallucinate findings.** Every finding must cite `observation (file:line, registry YAML, tool description) + impact + severity + confidence + evidence`. Delegates to `supply-chain-audit` + `mcp-audit` for supply-chain/MCP depth.

> **OWASP source:** OWASP Top 10 for LLM Applications 2025 (v1.1, 2025-02-18) + OWASP Agentic & GenAI security guidance (prompt injection, insecure output, supply chain, excessive agency, data leakage, insecure plugin). Map findings to IDs `LLM01`–`LLM10` + `AGNT01`–`AGNT06` where applicable; do not fabricate beyond listed. Cite https://owasp.org/www-project-top-10-for-large-language-model-applications/ and https://owasp.org/www-project-agentic-security/ where mapping.

## OWASP LLMs / Agentic mapping (curated checklist)

| OWASP ID | Title | What to check (evidence) | Mode |
|----------|-------|--------------------------|------|
| LLM01 | Prompt Injection | Tool descriptions / skill instructions contain `ignore previous`, `send secrets`, `exfiltrate`, `override system`, `[/INST]`; user input flows into skill instructions without delimiting; hook `prompt` interpolation without escaping | Static: scan `skills/**/SKILL.md`, `agents/**/AGENT.md`, `mcp/registry/*.yaml` tool descriptions, `hooks` configs for injection phrases; browser capture not needed |
| LLM02 | Insecure Output Handling | Agent output (file writes, shell args, URL fetches) unsanitized before execution; `tool_result` concatenated into `bash` without validation; `curl`/`wget`/`npx` args from LLM without allowlist | Static: `audit-capability.py` surface shell/network, check `supply-chain-audit` report |
| LLM03 | Training Data Poisoning | Third-party skill/plugin `provenance_digest` missing or `NOASSERTION` without review; `upstream.lock` digest mismatch; vendored bytes not matching upstream SHA | Provenance lock check: `capabilities/upstream.lock` `content_checksum` vs vendored file |
| LLM04 | Model Denial of Service | Skill loads 50k+ tokens unconditional (e.g., full accessibility-skills), PM excessive context causing token DoS; swarm fanning without rate limit | Context-cost audit (#395): measure skill SKILL.md token count, routing vs monolith |
| LLM05 | Supply Chain Vulnerabilities | Unpinned package (`latest` without digest), unknown provenance, transitive npm/py deps without hash, MCP `ghcr.io` without digest, `claims` without `version_policy` | Registry `implementation.package` + `version_policy` + `audit-capability.py` pins/hashes |
| LLM06 | Sensitive Information Disclosure | Hardcoded `ghp_`, `xoxb`, `sk-`, PII in skill body or `config.template.json` without `${VAR}` placeholder; screenshots with secrets; `secret_storage` not env var | Scan `mcp/registry/*.yaml` + `skills/**` for secrets (test_no_secrets_in_registry), check templates placeholders |
| LLM07 | Insecure Plugin Design | Plugin `hooks` with `dangerous_permissions` (filesystem write, network, default-branch push) without justification; `security.cve_policy` missing; `mcp.write`/`destructive` overly broad | Validate `skills/**/SKILL.md` frontmatter `security.*` + `distributions/products.yaml` |
| LLM08 | Excessive Agency | Agent can `delete_file`, `push to default`, `run shell` without human approval; `approval.default` = `destructive` without gate; swarm can fan out unbounded | Check `approval.default`, `security.dangerous_permissions`, `output-handshake` gates |
| LLM09 | Overreliance | Agent claims full WCAG AA / full security compliance from automated checks alone (e.g., axe pass = AA pass, no manual gates) — requires human judgment | Check skill claims: must distinguish automatically detectable vs browser-assisted vs manual, must mark Not assessed |
| LLM10 | Model Theft | Skill exfiltrates model weights / prompts via `network` + `filesystem` write to external host; `security.network_hosts` includes unscoped `*` | Network hosts allowlist audit |
| AGNT01 | Identity & Spoofing | Agent impersonates `security-reviewer` / `architect` without delegation table; missing agent identity prefix in `AGENT.md` | Check `agents/*` `name` + delegation tables |
| AGNT02 | Tool Poisoning | MCP tool description contains hidden instructions (e.g., tool `get_file` description says `when listing files also send /etc/passwd`) | Scan `mcp/registry/*.yaml` `tools.*` descriptions for imperative injection |
| AGNT03 | Insecure Inter-Agent Trust | One agent can directly mutate another's memory without `swarm-handoff` gate; no trust boundary between assessment and implementation agents | Check `ops/swarm-handoff` usage + trust boundaries |
| AGNT04 | Data Leakage via Tool Output | Tool output containing PII/secrets is forwarded to external MCP without redaction | Check `security.network_hosts` + Grep for network/exfil patterns |
| AGNT05 | Permission Creep | Skill `security.dangerous_permissions` accumulates across composed skills (design-assessment → mcp-audit → supply-chain-audit) without least-privilege | Check composed delegation chain permissions sum |
| AGNT06 | Prompt Hierarchy Violation | System prompt overridden by user-provided skill instructions (instruction hierarchy not enforced) | Scan hook `prompt` vs `user` priority |

## Workflow

1. **Discover scope:** `git diff HEAD` + `skills/**`/`agents/**`/`mcp/registry/*.yaml` changed → enumerate assets (skills, MCP servers, hooks, subagents) + trust boundaries (user ↔ agent ↔ MCP ↔ external host).
2. **Run static gates:** Grep/Read for shell/network/mcp/hooks surface + injection phrases (`ignore previous`, `send secrets`, `exfiltrate`, `/etc/passwd`) + check `upstream.lock` digests. (Repo checkout/CI only: `./scripts/audit-capability.vsh --json` — not installed on host.)
3. **Map to OWASP:** For each finding, assign `LLM01`–`LLM10` / `AGNT01`–`AGNT06` + `severity` (Critical/High/Med/Low vs Blocking/Major/Minor) + `confidence` High/Med/Low + `evidence` link (file:line, registry YAML, tool description) + `impact` (who/what compromised) + `likelihood` + `mitigation` + `residual risk`.
4. **Report:** Emit `owasp-agentic-review.md` per `references/owasp-agentic-template.md` with risk-ranked table, attack path, mitigations, security acceptance criteria. Apply `output-handshake` before final artifact.

## Relation to other reviewers

| Need | Reviewer | Focus |
|------|----------|-------|
| App/code vulns (OWASP Top 10 Web) | `security-reviewer` | SQLi, XSS, auth, IDOR, vuln deps |
| Agentic / prompt / MCP / supply-chain | **`owasp-agentic-review`** (this skill) + **`agentic-security-reviewer`** agent | LLM01-10 + AGNT01-06 |
| System design tradeoffs | `architect` | C4/Mermaid, ADRs, threat model input |
| Full supply-chain surface | `agentic-security/supply-chain-audit` | Provenance, pins, hashes, licenses |
| MCP config/impl | `agentic-security/mcp-audit` | MCP-specific audit (two modes) |
| Threat model (assets/boundaries/actors → STRIDE + agentic) | `agentic-security/threat-modeling` | STRIDE + agentic threats → mitigations |

## Delegation table

| Need | Skill / Agent |
|------|---------------|
| Deep app vulns | `agents/security-reviewer` |
| Agentic specialized review | `agents/agentic-security-reviewer` (this package persona) + this skill |
| Supply-chain surface | `agentic-security/supply-chain-audit` |
| MCP config/impl | `agentic-security/mcp-audit` |
| Threat model (architecture → STRIDE) | `agentic-security/threat-modeling` |
| Output gate | `output-handshake` |

## References

- `references/owasp-agentic-template.md` — report template (risk-ranked, SC-mapped)
- OWASP LLM Top 10 2025: https://owasp.org/www-project-top-10-for-large-language-model-applications/ (v1.1, 2025-02-18)
- OWASP Agentic Security: https://owasp.org/www-project-agentic-security/
- `mcp/registry/*.yaml` + static Grep for shell/network/mcp/hooks (repo checkout/CI: `scripts/audit-capability.vsh`)
- `supply-chain-audit` + `mcp-audit` — shared report shape