High Risk
Fastmail email and calendar management via JMAP and CalDAV APIs
H:4 D:4 A:3 C:1
⚠️ Hazard Flags
EXEC CODE_EXEC PERSISTENCE FS_READ_USER NET_EGRESS_ANY CREDS_ENV CREDS_FILES CREDS_BROWSER ACT_SEND_MESSAGE PI_WEB PI_DOCUMENTS
📋 Capabilities
Execution
- ✅ Shell execution
- ✅ Code execution
- ✅ Install dependencies
- ✅ Persistence
- Privilege: user
Filesystem
- ❌ Read workspace
- ❌ Write workspace
- ✅ Read home
- ❌ Write home
- ❌ Read system
- ❌ Delete
Network
- Egress: any
- ❌ Ingress
Credentials
- ✅ Environment vars
- ✅ Credential files
- ✅ Browser data
- ❌ Keychain
Actions
✅ send messages❌ post public❌ purchase❌ transfer money❌ deploy❌ delete external
🔒 Containment
Level: maximum
Required:
- APPROVE_SEND: Can send messages
- SANDBOX_CONTAINER: Code execution capability
Recommended:
- LOG_ACTIONS: Audit trail for all actions
⚡ Risks
Pipe-to-shell pattern detected (curl|bash) in: README.md critical
Mitigation: Do not execute. Review source for malicious intent.
Code obfuscation detected in: dist/cli.js medium
Mitigation: Deobfuscate and review code before use.
Prompt injection patterns detected in: SKILL.md high
Mitigation: Review SKILL.md for hidden instructions. Do not use with untrusted input.
Resource abuse detected: RESOURCE_ABUSE_LARGE_ALLOCATION high
Mitigation: Limit memory allocation. Process data in chunks
Unauthorized tool use: INSTRUCTED_BINARY_INSTALL high
Mitigation: Avoid instructing agents to install arbitrary binaries; bundle dependencies or use sandboxed environments
Command injection risk: COMMAND_INJECTION_EVAL, MCP_SCRIPT_TAGS critical
Mitigation: Avoid eval(), exec(), and compile(). Use safer alternatives like ast.literal_eval()
Social engineering indicators: SOCIAL_ENG_VAGUE_DESCRIPTION low
Mitigation: Provide clear, detailed description of skill functionality
Tool poisoning: hidden behaviors detected (MCP_TOOL_POISONING_SENSITIVE_DATA) high
Mitigation: Remove references to sensitive data collection.
Want a deeper analysis?
This report was generated by static analysis. Get an LLM-powered deep review with behavioral reasoning and attack surface mapping.
🧠 Deep Analysis — $5.00🚨 Incident Response
Kill switch: Stop the agent process
Containment: Review logs for unexpected actions
Recovery: Depends on skill capabilities
📄 Raw SSDS JSON click to expand
{
"meta": {
"document_id": "ssds:auto:fastmail:2.0.0",
"ssds_version": "0.2.0",
"scanner_version": "0.4.0+fe6fd9123d50",
"created_at": "2026-03-28T09:12:40.519Z",
"created_by": {
"agent": "safeagentskills-cli/generate-ssds"
},
"language": "en",
"notes": "Auto-generated SSDS. Manual review recommended."
},
"skill": {
"name": "Fastmail",
"version": "2.0.0",
"format": "agent_skill",
"description": "Fastmail email and calendar management via JMAP and CalDAV APIs",
"publisher": "ClawHub",
"source": {
"channel": "clawhub",
"slug": "fastmail",
"owner": "witooh",
"downloads": 1425,
"stars": 0
},
"artifact": {
"sha256": "094a7644cec49be06683cffb7f01844a86463893416a72e40eeee6ad316ba0d2",
"hash_method": "files_sorted"
}
},
"capabilities": {
"execution": {
"can_exec_shell": true,
"can_exec_code": true,
"privilege_level": "user",
"can_install_deps": true,
"can_persist": true
},
"filesystem": {
"reads_workspace": false,
"reads_user_home": true,
"reads_system": false,
"writes_workspace": false,
"writes_user_home": false,
"writes_system": false,
"can_delete": false
},
"network": {
"egress": "any",
"ingress": false
},
"credentials": {
"reads_env_vars": true,
"reads_credential_files": true,
"reads_browser_data": true,
"reads_keychain": false
},
"services": [],
"actions": {
"can_send_messages": true,
"can_post_public": false,
"can_purchase": false,
"can_transfer_money": false,
"can_deploy": false,
"can_delete_external": false
},
"prompt_injection_surfaces": [
"web",
"documents"
],
"content_types": [
"general"
]
},
"hazards": {
"hdac": {
"H": 4,
"D": 4,
"A": 3,
"C": 1
},
"flags": [
"EXEC",
"CODE_EXEC",
"PERSISTENCE",
"FS_READ_USER",
"NET_EGRESS_ANY",
"CREDS_ENV",
"CREDS_FILES",
"CREDS_BROWSER",
"ACT_SEND_MESSAGE",
"PI_WEB",
"PI_DOCUMENTS"
],
"custom_flags": [
{
"code": "PIPE_TO_SHELL",
"name": "Pipe to Shell",
"description": "Downloads and executes remote code (curl|bash pattern) in: README.md"
},
{
"code": "OBFUSCATED_CODE",
"name": "Obfuscated Code",
"description": "Contains obfuscated code patterns in: dist/cli.js"
},
{
"code": "PROMPT_INJECTION",
"name": "Prompt Injection Risk",
"description": "Contains prompt injection patterns in: SKILL.md"
},
{
"code": "PERSISTENCE",
"name": "Persistence Mechanism",
"description": "Creates scheduled tasks or startup entries in: README.md"
},
{
"code": "RESOURCE_ABUSE",
"name": "Resource Abuse Risk",
"description": "RESOURCE_ABUSE_LARGE_ALLOCATION detected: Very large memory allocation"
},
{
"code": "TOOL_ABUSE",
"name": "Unauthorized Tool Use",
"description": "INSTRUCTED_BINARY_INSTALL: Instructs agent to install external binary or package"
},
{
"code": "SOCIAL_ENGINEERING",
"name": "Social Engineering Risk",
"description": "SOCIAL_ENG_VAGUE_DESCRIPTION: Skill description is too vague or missing"
},
{
"code": "COMMAND_INJECTION",
"name": "Command Injection Risk",
"description": "COMMAND_INJECTION_EVAL, MCP_SCRIPT_TAGS: Dangerous code execution functions that can execute arbitrary code"
},
{
"code": "TOOL_POISONING",
"name": "Tool Poisoning",
"description": "Hidden secondary behavior detected: MCP_TOOL_POISONING_SENSITIVE_DATA"
}
],
"confidence": {
"level": "medium",
"basis": [
"static_analysis"
],
"notes": "Detected 9 security patterns (8 vendored rule hits). Review recommended."
},
"rationale": {
"H": "H4: Critical: Privilege escalation or malware detected",
"D": "D4: Critical: Credential theft or data exfiltration",
"A": "A3: External actions (deploy/message/post)",
"C": "C1: General content"
}
},
"containment": {
"level": "maximum",
"required": [
{
"control": "APPROVE_SEND",
"reason": "Can send messages"
},
{
"control": "SANDBOX_CONTAINER",
"reason": "Code execution capability"
}
],
"recommended": [
{
"control": "LOG_ACTIONS",
"reason": "Audit trail for all actions"
}
],
"uncontained_risk": "Risk level depends on manual review of actual capabilities."
},
"risks": {
"risks": [
{
"risk": "Pipe-to-shell pattern detected (curl|bash) in: README.md",
"severity": "critical",
"mitigation": "Do not execute. Review source for malicious intent."
},
{
"risk": "Code obfuscation detected in: dist/cli.js",
"severity": "medium",
"mitigation": "Deobfuscate and review code before use."
},
{
"risk": "Prompt injection patterns detected in: SKILL.md",
"severity": "high",
"mitigation": "Review SKILL.md for hidden instructions. Do not use with untrusted input."
},
{
"risk": "Resource abuse detected: RESOURCE_ABUSE_LARGE_ALLOCATION",
"severity": "high",
"mitigation": "Limit memory allocation. Process data in chunks"
},
{
"risk": "Unauthorized tool use: INSTRUCTED_BINARY_INSTALL",
"severity": "high",
"mitigation": "Avoid instructing agents to install arbitrary binaries; bundle dependencies or use sandboxed environments"
},
{
"risk": "Command injection risk: COMMAND_INJECTION_EVAL, MCP_SCRIPT_TAGS",
"severity": "critical",
"mitigation": "Avoid eval(), exec(), and compile(). Use safer alternatives like ast.literal_eval()"
},
{
"risk": "Social engineering indicators: SOCIAL_ENG_VAGUE_DESCRIPTION",
"severity": "low",
"mitigation": "Provide clear, detailed description of skill functionality"
},
{
"risk": "Tool poisoning: hidden behaviors detected (MCP_TOOL_POISONING_SENSITIVE_DATA)",
"severity": "high",
"mitigation": "Remove references to sensitive data collection."
}
],
"limitations": [
"Static analysis only - runtime behavior not verified"
]
},
"incident_response": {
"kill_switch": [
"Stop the agent process"
],
"containment": [
"Review logs for unexpected actions"
],
"recovery": [
"Depends on skill capabilities"
]
},
"evidence": [
{
"evidence_id": "EV:file-1",
"type": "file_excerpt",
"title": "_meta.json",
"file_path": "_meta.json"
},
{
"evidence_id": "EV:file-2",
"type": "file_excerpt",
"title": "SKILL.md",
"file_path": "SKILL.md"
},
{
"evidence_id": "EV:file-3",
"type": "file_excerpt",
"title": "scripts/tools/email.ts",
"file_path": "scripts/tools/email.ts"
},
{
"evidence_id": "EV:file-4",
"type": "file_excerpt",
"title": "scripts/tools/calendar.ts",
"file_path": "scripts/tools/calendar.ts"
},
{
"evidence_id": "EV:file-5",
"type": "file_excerpt",
"title": "scripts/jmap-client.ts",
"file_path": "scripts/jmap-client.ts"
},
{
"evidence_id": "EV:file-6",
"type": "file_excerpt",
"title": "scripts/errors.ts",
"file_path": "scripts/errors.ts"
},
{
"evidence_id": "EV:file-7",
"type": "file_excerpt",
"title": "scripts/cli.ts",
"file_path": "scripts/cli.ts"
},
{
"evidence_id": "EV:file-8",
"type": "file_excerpt",
"title": "scripts/caldav-client.ts",
"file_path": "scripts/caldav-client.ts"
},
{
"evidence_id": "EV:file-9",
"type": "file_excerpt",
"title": "README.md",
"file_path": "README.md"
},
{
"evidence_id": "EV:file-10",
"type": "file_excerpt",
"title": "package.json",
"file_path": "package.json"
},
{
"evidence_id": "EV:cisco-1",
"type": "file_excerpt",
"title": "SOCIAL_ENG_VAGUE_DESCRIPTION [LOW] SKILL.md:1: ---",
"file_path": "SKILL.md"
},
{
"evidence_id": "EV:cisco-2",
"type": "file_excerpt",
"title": "MCP_TOOL_POISONING_SENSITIVE_DATA [HIGH] SKILL.md:40: - 📧 Check inbox or search emails",
"file_path": "SKILL.md"
},
{
"evidence_id": "EV:cisco-3",
"type": "file_excerpt",
"title": "INSTRUCTED_BINARY_INSTALL [HIGH] README.md:246: - [Bun](https://bun.sh/) - JavaScript runtime (install with `curl -fsSL https://",
"file_path": "README.md"
},
{
"evidence_id": "EV:cisco-4",
"type": "file_excerpt",
"title": "MCP_TOOL_POISONING_SENSITIVE_DATA [HIGH] README.md:14: | `search_emails` | Search emails by text query |",
"file_path": "README.md"
},
{
"evidence_id": "EV:cisco-5",
"type": "file_excerpt",
"title": "COMMAND_INJECTION_EVAL [CRITICAL] dist/cli.js:218: var match = /charset=([A-Za-z0-9_-]+)/.exec(blob.type);",
"file_path": "dist/cli.js"
},
{
"evidence_id": "EV:cisco-6",
"type": "file_excerpt",
"title": "OBFUSCATION_BASE64_LARGE [MEDIUM] dist/cli.js:1589: checkIEEE754(buf, value, offset, 8, 17976931348623157000000000000000000000000000",
"file_path": "dist/cli.js"
},
{
"evidence_id": "EV:cisco-7",
"type": "file_excerpt",
"title": "RESOURCE_ABUSE_LARGE_ALLOCATION [HIGH] dist/cli.js:2052: return (this[offset] | this[offset + 1] << 8 | this[offset + 2] << 16) + this[of",
"file_path": "dist/cli.js"
},
{
"evidence_id": "EV:cisco-8",
"type": "file_excerpt",
"title": "MCP_SCRIPT_TAGS [HIGH] dist/cli.js:9615: var createObject = async (params) => {",
"file_path": "dist/cli.js"
}
]
}