ContrastAPI

Redirect Chain

redirect_chain

Read-onlyIdempotent

Walk an HTTP redirect chain hop-by-hop, returning per-hop {url, status_code, location, latency_ms}. Use to deobfuscate URL shorteners (bit.ly / t.co / lnkd.in), audit suspicious links from phishing investigations, or trace marketing tracking redirects. SSRF-guarded: each redirect target's resolved IP is re-validated before connecting (private IPs and non-HTTP schemes rejected). Up to 10 hops; loop_detected=true if a hop would revisit a previously-seen URL (we abort before the duplicate fetch); truncated=true if the chain still had a 30x at hop 10. Per-target eTLD+1 throttle (60 req/min) consumed once for the start host AND once per new host reached — a chain across 11 unrelated domains cannot bypass the cap. Free: 30/hr, Pro: 500/hr. Returns {start_url, final_url, hops, hop_count, final_status, loop_detected, truncated, summary}. Returns 502 ErrorResponse on hard fetch failure (timeout / TLS / connect); 429 with Retry-After if a hop's eTLD+1 throttle is exceeded mid-chain.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`url`	Yes	Full URL whose redirect chain to walk, e.g. 'https://bit.ly/3xyz' or 'http://example.com/old-path'. Must start with http:// or https://. Pass the URL exactly as you'd `curl -L` it; the server handles encoding.

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections. Dates show when Glama detected each change.

Changed2 schema fields changedJun 2, 2026
- changedOutput schema / properties / result / properties / next_calls / type
```
Previous value: -"array"New value: +[
+  "array",
+  "null"
+]
```
- changedOutput schema / properties / result / properties / verdict / type
```
Previous value: -"object"New value: +[
+  "object",
+  "null"
+]
```
Changed1 schema field changedMay 25, 2026
- changedOutput schema / properties / result / properties / next_calls / type
```
Previous value: -"object"New value: +"array"
```

Changed1 schema field changedMay 22, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "properties": {
+    "result": {
+      "properties": {
+        "final_status": {
+          "type": "integer"
+        },
+        "final_url": {
+          "type": "string"
+        },
+        "hop_count": {
+          "type": "integer"
+        },
+        "hops": {
+          "type": "array"
+        },
+        "loop_detected": {
+          "type": "boolean"
+        },
+        "next_calls": {
+          "type": "object"
+        },
+        "start_url": {
+          "type": "string"
+        },
+        "summary": {
+          "type": "string"
+        },
+        "truncated": {
+          "type": "boolean"
+        },
+        "verdict": {
+          "type": "object"
+        }
+      },
+      "required": [
+        "start_url",
+        "final_url",
+        "hop_count",
+        "final_status"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "result"
+  ],
+  "type": "object"
+}

Changed1 schema field changedMay 22, 2026

changedOutput schema / (root)

Previous value: -{
-  "$defs": {
-    "ErrorDetail": {
-      "properties": {
-        "code": {
-          "enum": [
-            "invalid_argument",
-            "not_found",
-            "rate_limit_exceeded",
-            "auth_required",
-            "tier_limit",
-            "upstream_timeout",
-            "upstream_error",
-            "internal_error"
-          ],
-          "type": "string"
-        },
-        "docs_url": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "message": {
-          "maxLength": 500,
-          "type": "string"
-        },
-        "retry_after_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "upgrade_url": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "required": [
-        "code",
-        "message"
-      ],
-      "type": "object"
-    },
-    "ErrorResponse": {
-      "properties": {
-        "error": {
-          "$ref": "#/$defs/ErrorDetail"
-        }
-      },
-      "required": [
-        "error"
-      ],
-      "type": "object"
-    },
-    "PivotHint": {
-      "additionalProperties": true,
-      "properties": {
-        "input": {
-          "type": "string"
-        },
-        "params": {
-          "anyOf": [
-            {
-              "additionalProperties": {
-                "type": "string"
-              },
-              "type": "object"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "reason": {
-          "type": "string"
-        },
-        "tool": {
-          "enum": [
-            "cve_lookup",
-            "cve_search",
-            "cve_leading",
-            "bulk_cve_lookup",
-            "calculate_risk_score",
-            "get_cvss_details",
-            "exploit_lookup",
-            "kev_detail",
-            "cwe_lookup",
-            "subdomain_enum",
-            "ssl_check",
-            "tech_fingerprint",
-            "asn_lookup",
-            "ip_lookup",
-            "ioc_lookup",
-            "bulk_ioc_lookup",
-            "hash_lookup",
-            "threat_intel",
-            "threat_report",
-            "audit_domain",
-            "domain_report",
-            "dns_lookup",
-            "whois_lookup",
-            "wayback_lookup",
-            "scan_headers",
-            "check_headers",
-            "check_secrets",
-            "check_injection",
-            "check_dependencies",
-            "email_mx",
-            "email_security_posture",
-            "email_disposable",
-            "email_verify",
-            "robots_txt",
-            "redirect_chain",
-            "brand_assets",
-            "seo_audit",
-            "phone_lookup",
-            "username_lookup",
-            "password_check",
-            "phishing_check",
-            "atlas_technique_lookup",
-            "atlas_technique_search",
-            "bulk_atlas_technique_lookup",
-            "atlas_case_study_lookup",
-            "atlas_case_study_search",
-            "d3fend_defense_lookup",
-            "d3fend_defense_search",
-            "d3fend_defense_for_attack",
-            "d3fend_attack_coverage",
-            "sigma_rule_lookup",
-            "bulk_sigma_rule_lookup",
-            "tech_stack_cve_audit"
-          ],
-          "type": "string"
-        }
-      },
-      "required": [
-        "tool",
-        "input",
-        "reason"
-      ],
-      "type": "object"
-    },
-    "RedirectChainResponse": {
-      "properties": {
-        "final_status": {
-          "type": "integer"
-        },
-        "final_url": {
-          "type": "string"
-        },
-        "hop_count": {
-          "type": "integer"
-        },
-        "hops": {
-          "items": {
-            "$ref": "#/$defs/RedirectHop"
-          },
-          "type": "array"
-        },
-        "loop_detected": {
-          "type": "boolean"
-        },
-        "next_calls": {
-          "anyOf": [
-            {
-              "items": {
-                "$ref": "#/$defs/PivotHint"
-              },
-              "type": "array"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "start_url": {
-          "type": "string"
-        },
-        "summary": {
-          "type": "string"
-        },
-        "truncated": {
-          "type": "boolean"
-        },
-        "verdict": {
-          "anyOf": [
-            {
-              "$ref": "#/$defs/Verdict"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        }
-      },
-      "required": [
-        "start_url",
-        "final_url",
-        "hop_count",
-        "final_status"
-      ],
-      "type": "object"
-    },
-    "RedirectHop": {
-      "additionalProperties": true,
-      "properties": {
-        "latency_ms": {
-          "type": "integer"
-        },
-        "location": {
-          "anyOf": [
-            {
-              "type": "string"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "status_code": {
-          "type": "integer"
-        },
-        "url": {
-          "type": "string"
-        }
-      },
-      "required": [
-        "url",
-        "status_code",
-        "latency_ms"
-      ],
-      "type": "object"
-    },
-    "Verdict": {
-      "properties": {
-        "completeness": {
-          "enum": [
-            "complete",
-            "partial",
-            "minimal"
-          ],
-          "type": "string"
-        },
-        "data_age_seconds": {
-          "anyOf": [
-            {
-              "type": "integer"
-            },
-            {
-              "type": "null"
-            }
-          ]
-        },
-        "deterministic": {
-          "type": "boolean"
-        },
-        "falsifiable_fields": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "sources_queried": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        },
-        "sources_unavailable": {
-          "items": {
-            "type": "string"
-          },
-          "type": "array"
-        }
-      },
-      "required": [
-        "deterministic"
-      ],
-      "type": "object"
-    }
-  },
-  "properties": {
-    "result": {
-      "anyOf": [
-        {
-          "$ref": "#/$defs/RedirectChainResponse"
-        },
-        {
-          "$ref": "#/$defs/ErrorResponse"
-        }
-      ]
-    }
-  },
-  "required": [
-    "result"
-  ],
-  "type": "object"
-}New value: +null

Changed82 schema fields changedMay 17, 2026

removedOutput schema / $defs / ErrorDetail / description

Removed value: -"Structured failure body. Codes mirror app/exceptions.AppException\nsubclasses; agent retry / upgrade decisions key off `code`, not `message`."

removedOutput schema / $defs / ErrorDetail / properties / code / description

Removed value: -"Stable machine-readable failure category. Agents key retry/upgrade decisions off this."

removedOutput schema / $defs / ErrorDetail / properties / code / title
```
Removed value: -"Code"
```
removedOutput schema / $defs / ErrorDetail / properties / docs_url / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / docs_url / description

Removed value: -"Documentation pointer (e.g. tool input contract) when code='invalid_argument'."

removedOutput schema / $defs / ErrorDetail / properties / docs_url / title
```
Removed value: -"Docs Url"
```

removedOutput schema / $defs / ErrorDetail / properties / message / description

Removed value: -"Human-readable detail. Free text — never parse. Capped at 500 chars to prevent oversized upstream errors from bloating responses."

removedOutput schema / $defs / ErrorDetail / properties / message / title
```
Removed value: -"Message"
```
removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / description

Removed value: -"When code='rate_limit_exceeded', the minimum seconds to wait before retrying."

removedOutput schema / $defs / ErrorDetail / properties / retry_after_seconds / title
```
Removed value: -"Retry After Seconds"
```
removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / default
```
Removed value: -null
```

removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / description

Removed value: -"Pricing/upgrade URL when code='tier_limit' or 'rate_limit_exceeded' on the Free tier."

removedOutput schema / $defs / ErrorDetail / properties / upgrade_url / title
```
Removed value: -"Upgrade Url"
```
removedOutput schema / $defs / ErrorDetail / title
```
Removed value: -"ErrorDetail"
```

removedOutput schema / $defs / ErrorResponse / description

Removed value: -"MCP error envelope. Tool return type is always\n`SpecificResponse | ErrorResponse` — Union flag tells the agent which arm\narrived without parsing the inner body."

removedOutput schema / $defs / ErrorResponse / title
```
Removed value: -"ErrorResponse"
```

removedOutput schema / $defs / PivotHint / description

Removed value: -"A suggested follow-up MCP tool call. Surfaced inside response.next_calls so\nLLM agents can chain related lookups without manual prompting. Each hint names\nthe tool, the input value to pass, and a short reason explaining why this\npivot adds value in the current context."

removedOutput schema / $defs / PivotHint / properties / input / description

Removed value: -"Suggested input value to pass to the tool — typically a CVE ID, CWE ID, domain, or IP. Pre-populated from the current response so the agent can call the next tool without re-deriving the argument."

removedOutput schema / $defs / PivotHint / properties / input / title
```
Removed value: -"Input"
```
removedOutput schema / $defs / PivotHint / properties / params / default
```
Removed value: -null
```

removedOutput schema / $defs / PivotHint / properties / params / description

Removed value: -"Optional extra kwargs to pass alongside `input`. Used by pivot generators when the next call benefits from a secondary parameter, e.g. {'exclude_id': 'AML.T0051'} to skip the originating technique from a sibling-tactic search. Omitted when no extra args are needed."

removedOutput schema / $defs / PivotHint / properties / params / title
```
Removed value: -"Params"
```

removedOutput schema / $defs / PivotHint / properties / reason / description

Removed value: -"Short rationale (one sentence) for why this follow-up call adds value, e.g. 'Federal patch deadline + ransomware association', 'Public exploits / PoC availability'."

removedOutput schema / $defs / PivotHint / properties / reason / title
```
Removed value: -"Reason"
```

removedOutput schema / $defs / PivotHint / properties / tool / description

Removed value: -"Canonical MCP tool name to call next. Constrained to known operation_ids in tools/list — adding a new tool here requires expanding the Literal."

removedOutput schema / $defs / PivotHint / properties / tool / title
```
Removed value: -"Tool"
```
removedOutput schema / $defs / PivotHint / title
```
Removed value: -"PivotHint"
```

removedOutput schema / $defs / RedirectChainResponse / description

Removed value: -"Manual hop-by-hop walk through HTTP redirects. SSRF-guarded at each hop."

removedOutput schema / $defs / RedirectChainResponse / properties / final_status / description

Removed value: -"HTTP status of the last hop, or 0 if the chain failed before any successful response."

removedOutput schema / $defs / RedirectChainResponse / properties / final_status / title
```
Removed value: -"Final Status"
```

removedOutput schema / $defs / RedirectChainResponse / properties / final_url / description

Removed value: -"The URL of the terminal (non-redirect) response, or the last redirect target reached if the chain was truncated. `_untrusted`."

removedOutput schema / $defs / RedirectChainResponse / properties / final_url / title
```
Removed value: -"Final Url"
```

removedOutput schema / $defs / RedirectChainResponse / properties / hop_count / description

Removed value: -"Total fetches performed (= len(hops)). Capped at REDIRECT_MAX_HOPS=10."

removedOutput schema / $defs / RedirectChainResponse / properties / hop_count / title
```
Removed value: -"Hop Count"
```

removedOutput schema / $defs / RedirectChainResponse / properties / hops / description

Removed value: -"Ordered list of hops, one entry per HTTP request issued. hops[0].url == start_url."

removedOutput schema / $defs / RedirectChainResponse / properties / hops / title
```
Removed value: -"Hops"
```
removedOutput schema / $defs / RedirectChainResponse / properties / loop_detected / default
```
Removed value: -false
```

removedOutput schema / $defs / RedirectChainResponse / properties / loop_detected / description

Removed value: -"True if a hop's Location pointed back to a URL already visited (the duplicate fetch was NOT performed)."

removedOutput schema / $defs / RedirectChainResponse / properties / loop_detected / title
```
Removed value: -"Loop Detected"
```
removedOutput schema / $defs / RedirectChainResponse / properties / next_calls / default
```
Removed value: -null
```

removedOutput schema / $defs / RedirectChainResponse / properties / next_calls / description

Removed value: -"Suggested follow-up MCP tool calls. Ordered by relevance; agents should chain these without re-prompting the user."

removedOutput schema / $defs / RedirectChainResponse / properties / next_calls / title
```
Removed value: -"Next Calls"
```
removedOutput schema / $defs / RedirectChainResponse / properties / start_url / description
```
Removed value: -"Echo of the input URL after sanitisation."
```
removedOutput schema / $defs / RedirectChainResponse / properties / start_url / title
```
Removed value: -"Start Url"
```
removedOutput schema / $defs / RedirectChainResponse / properties / summary / default
```
Removed value: -""
```
removedOutput schema / $defs / RedirectChainResponse / properties / summary / description
```
Removed value: -"One-line human-readable summary."
```
removedOutput schema / $defs / RedirectChainResponse / properties / summary / title
```
Removed value: -"Summary"
```
removedOutput schema / $defs / RedirectChainResponse / properties / truncated / default
```
Removed value: -false
```

removedOutput schema / $defs / RedirectChainResponse / properties / truncated / description

Removed value: -"True if the chain still had a 30x at hop_count == REDIRECT_MAX_HOPS — the next hop was NOT followed."

removedOutput schema / $defs / RedirectChainResponse / properties / truncated / title
```
Removed value: -"Truncated"
```
removedOutput schema / $defs / RedirectChainResponse / properties / verdict / default
```
Removed value: -null
```

removedOutput schema / $defs / RedirectChainResponse / properties / verdict / description

Removed value: -"Falsifiability metadata: sources_queried, sources_unavailable, completeness, deterministic flag. Lets agents distinguish 'no data' from 'source failed' without re-running the call."

removedOutput schema / $defs / RedirectChainResponse / title
```
Removed value: -"RedirectChainResponse"
```
removedOutput schema / $defs / RedirectHop / description
```
Removed value: -"Single hop in a redirect chain."
```
removedOutput schema / $defs / RedirectHop / properties / latency_ms / description
```
Removed value: -"Round-trip time in milliseconds for this single hop fetch."
```
removedOutput schema / $defs / RedirectHop / properties / latency_ms / title
```
Removed value: -"Latency Ms"
```
removedOutput schema / $defs / RedirectHop / properties / location / default
```
Removed value: -null
```

removedOutput schema / $defs / RedirectHop / properties / location / description

Removed value: -"Resolved Location header for this hop's response (absolute, against this hop's final URL). None when status is not a redirect or no Location was sent. `_untrusted`."

removedOutput schema / $defs / RedirectHop / properties / location / title
```
Removed value: -"Location"
```
removedOutput schema / $defs / RedirectHop / properties / status_code / description
```
Removed value: -"HTTP status returned at this hop."
```
removedOutput schema / $defs / RedirectHop / properties / status_code / title
```
Removed value: -"Status Code"
```

removedOutput schema / $defs / RedirectHop / properties / url / description

Removed value: -"The URL fetched at this hop (absolute, control-chars stripped). `_untrusted` — DO NOT execute or shell-out."

removedOutput schema / $defs / RedirectHop / properties / url / title
```
Removed value: -"Url"
```
removedOutput schema / $defs / RedirectHop / title
```
Removed value: -"RedirectHop"
```
removedOutput schema / $defs / Verdict / properties / completeness / default
```
Removed value: -"complete"
```

removedOutput schema / $defs / Verdict / properties / completeness / description

Removed value: -"'complete' = every planned source returned data; 'partial' = at least one source in sources_unavailable failed or was skipped; 'minimal' = only the primary/required source returned, optional enrichment missing."

removedOutput schema / $defs / Verdict / properties / completeness / title
```
Removed value: -"Completeness"
```
removedOutput schema / $defs / Verdict / properties / data_age_seconds / default
```
Removed value: -null
```

removedOutput schema / $defs / Verdict / properties / data_age_seconds / description

Removed value: -"Seconds elapsed since the oldest cached source was fetched, or null when every source was queried live for this request. Use to judge freshness."

removedOutput schema / $defs / Verdict / properties / data_age_seconds / title
```
Removed value: -"Data Age Seconds"
```

removedOutput schema / $defs / Verdict / properties / deterministic / description

Removed value: -"True when the response is fully reproducible from the listed sources for the same input at the same moment (no randomness, no model inference). False for endpoints that include probabilistic scoring or LLM output."

removedOutput schema / $defs / Verdict / properties / deterministic / title
```
Removed value: -"Deterministic"
```

removedOutput schema / $defs / Verdict / properties / falsifiable_fields / description

Removed value: -"Top-level response fields whose values a caller can independently re-derive from the named upstream sources (e.g. 'dns', 'ssl', 'whois'). Fields not in this list are derived/computed and cannot be directly re-verified."

removedOutput schema / $defs / Verdict / properties / falsifiable_fields / title
```
Removed value: -"Falsifiable Fields"
```

removedOutput schema / $defs / Verdict / properties / sources_queried / description

Removed value: -"Canonical source identifiers successfully consulted for this response (e.g. 'ripe_stat', 'shodan_internetdb', 'firehol'). Agent-readable list, order not significant."

removedOutput schema / $defs / Verdict / properties / sources_queried / title
```
Removed value: -"Sources Queried"
```

removedOutput schema / $defs / Verdict / properties / sources_unavailable / description

Removed value: -"Sources that were expected but not returned — either intentionally skipped (lite mode, tier gating) or failed (quota, timeout, upstream down). Empty list means every planned source produced data."

removedOutput schema / $defs / Verdict / properties / sources_unavailable / title
```
Removed value: -"Sources Unavailable"
```
removedOutput schema / $defs / Verdict / title
```
Removed value: -"Verdict"
```
removedOutput schema / properties / result / title
```
Removed value: -"Result"
```
removedOutput schema / title
```
Removed value: -"redirect_chainOutput"
```

Changed1 schema field changedMay 15, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_security_posture",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage",
-  "sigma_rule_lookup",
-  "bulk_sigma_rule_lookup"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage",
+  "sigma_rule_lookup",
+  "bulk_sigma_rule_lookup",
+  "tech_stack_cve_audit"
+]

Changed1 schema field changedMay 12, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_security_posture",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage",
+  "sigma_rule_lookup",
+  "bulk_sigma_rule_lookup"
+]

Changed1 schema field changedMay 12, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "calculate_risk_score",
-  "get_cvss_details",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_security_posture",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage"
+]

Changed1 schema field changedMay 8, 2026

changedOutput schema / $defs / PivotHint / properties / tool / enum

Previous value: -[
-  "cve_lookup",
-  "cve_search",
-  "cve_leading",
-  "bulk_cve_lookup",
-  "exploit_lookup",
-  "kev_detail",
-  "cwe_lookup",
-  "subdomain_enum",
-  "ssl_check",
-  "tech_fingerprint",
-  "asn_lookup",
-  "ip_lookup",
-  "ioc_lookup",
-  "bulk_ioc_lookup",
-  "hash_lookup",
-  "threat_intel",
-  "threat_report",
-  "audit_domain",
-  "domain_report",
-  "dns_lookup",
-  "whois_lookup",
-  "wayback_lookup",
-  "scan_headers",
-  "check_headers",
-  "check_secrets",
-  "check_injection",
-  "check_dependencies",
-  "email_mx",
-  "email_disposable",
-  "email_verify",
-  "robots_txt",
-  "redirect_chain",
-  "brand_assets",
-  "seo_audit",
-  "phone_lookup",
-  "username_lookup",
-  "password_check",
-  "phishing_check",
-  "atlas_technique_lookup",
-  "atlas_technique_search",
-  "bulk_atlas_technique_lookup",
-  "atlas_case_study_lookup",
-  "atlas_case_study_search",
-  "d3fend_defense_lookup",
-  "d3fend_defense_search",
-  "d3fend_defense_for_attack",
-  "d3fend_attack_coverage"
-]New value: +[
+  "cve_lookup",
+  "cve_search",
+  "cve_leading",
+  "bulk_cve_lookup",
+  "calculate_risk_score",
+  "get_cvss_details",
+  "exploit_lookup",
+  "kev_detail",
+  "cwe_lookup",
+  "subdomain_enum",
+  "ssl_check",
+  "tech_fingerprint",
+  "asn_lookup",
+  "ip_lookup",
+  "ioc_lookup",
+  "bulk_ioc_lookup",
+  "hash_lookup",
+  "threat_intel",
+  "threat_report",
+  "audit_domain",
+  "domain_report",
+  "dns_lookup",
+  "whois_lookup",
+  "wayback_lookup",
+  "scan_headers",
+  "check_headers",
+  "check_secrets",
+  "check_injection",
+  "check_dependencies",
+  "email_mx",
+  "email_disposable",
+  "email_verify",
+  "robots_txt",
+  "redirect_chain",
+  "brand_assets",
+  "seo_audit",
+  "phone_lookup",
+  "username_lookup",
+  "password_check",
+  "phishing_check",
+  "atlas_technique_lookup",
+  "atlas_technique_search",
+  "bulk_atlas_technique_lookup",
+  "atlas_case_study_lookup",
+  "atlas_case_study_search",
+  "d3fend_defense_lookup",
+  "d3fend_defense_search",
+  "d3fend_defense_for_attack",
+  "d3fend_attack_coverage"
+]

AddedMay 2, 2026

TDQS

A4.6/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

The description discloses extensive behavioral traits: SSRF-guarded target validation, 10-hop limit, loop_detected flag, truncated flag, per-target eTLD+1 throttle, rate limits (30/hr free, 500/hr Pro), and specific error responses (502, 429 with Retry-After). This goes well beyond the annotations which only specify readOnly, idempotent, openWorld, and non-destructive flags.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is dense but every sentence contributes concrete information—behavioral constraints, rate limits, return fields, and error cases. It is well-structured with the main action first, followed by use cases and edge-case details, though it is long.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description is complete for a network analysis tool: it covers return fields, edge cases (loop, truncation), safety mechanisms (SSRF guard), rate limits, and error responses. Given the rich annotations and output schema, no critical context is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema already provides a thorough description for `url`, giving 100% coverage. The tool description adds extra practical guidance ('Pass the URL exactly as you'd curl -L it'), enhancing the schema without redundancy. This warrants a 4 rather than the baseline 3.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and object ('Walk an HTTP redirect chain hop-by-hop') and details use cases (URL shortener deobfuscation, phishing investigations) that clearly distinguish it from sibling tools like DNS lookup or IP lookup.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

It explicitly states when to use the tool with three concrete scenarios (bit.ly/t.co/lnkd.in deobfuscation, phishing link audit, marketing tracking). However, it doesn't mention when not to use it or alternatives, so it falls short of a 5.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

A4.5/5.0

Disambiguation4/5

Most tools have clearly distinct purposes, with differences between lookup/search/scan/audit for each domain. However, some overlap exists (e.g., email_mx vs email_security_posture, scan_headers vs contrast_scan) which could cause occasional confusion. Overall, boundaries are well-defined.

Naming Consistency5/5

Tool names follow a consistent verb_noun pattern (e.g., cve_lookup, check_headers, bulk_cve_lookup) with all lowercase underscores. Variations like kev_detail or ssl_check are minor and still predictable. No chaotic mixing of conventions.

Tool Count4/5

54 tools is high but justified by the broad cybersecurity scope (CVE, ATLAS, D3FEND, Sigma, domain, email, IOC, scanning). Some redundancy exists (e.g., three email-related tools), but the count is not excessive given the API's comprehensive feature set.

Completeness5/5

The tool set thoroughly covers the threat intelligence and domain investigation lifecycle: CVE/KEV/exploit/CWE, ATLAS/D3FEND/Sigma, DNS/WHOIS/SSL/subdomains, email security, IOC enrichment, and active scanning. No significant gaps are apparent for the stated cybersecurity purpose.

Redirect Chain

Input Schema

Output Schema

Schema Changelog

TDQS

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TDQS

Resources