Probe V0
Server Details
Experimental MCP server for current empirical verification of explicit public HTTPS endpoint claims.
- Status
- Healthy
- Last Tested
- Transport
- Streamable HTTP · MCP 2025-11-25
- URL
- Repository
- lexbritten/probe-mcp
- GitHub Stars
- 0
TDQS
Scored across 2 tools
verify_http_claim performs live current verification while probe.history retrieves persisted past observations. The descriptions explicitly separate the two use cases, so an agent should not confuse them.
verify_http_claim follows a verb_object pattern, while probe.history uses a namespace.noun pattern. Both names are readable and lowercase, but the two naming styles are mixed rather than following one predictable convention.
With only two tools the surface feels thin, but the narrow purpose of live HTTP verification plus historical evidence lookup is served without unnecessary additions. The minimal count is appropriate but borderline on the calibration scale.
The core workflow is covered: verify a claim with current evidence and later inspect the persisted history. Minor gaps such as listing or clearing experiments are absent but not required for the stated verification loop.
Available Tools
2 toolsprobe.historyInspect Historical HTTP EvidenceARead-onlyIdempotentInspect
Retrieve up to 20 persisted observations for an existing Probe experiment ID without making a new HTTP request. Use after verify_http_claim to inspect repeated results, PASS/FAIL/ERROR counts, agreement, or whether the observed verdict changed between the two latest decisive observations. This is historical evidence lookup, not a current live verification; use verify_http_claim when freshness or present endpoint behavior matters.
| Name | Required | Description | Default |
|---|---|---|---|
| limit | No | Maximum number of newest stored observations to return, from 1 through 20. | |
| probe_id | Yes | The 64-character lowercase hexadecimal Probe experiment ID returned by verify_http_claim. |
Output Schema
| Name | Required | Description |
|---|---|---|
| summary | Yes | |
| probe_id | Yes | |
| protocol | Yes | |
| observations | Yes |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Beyond the annotations (readOnly, idempotent, non-destructive), the description discloses a key behavioral trait: it retrieves persisted observations 'without making a new HTTP request.' It also explains the kind of evidence an agent can derive, such as PASS/FAIL/ERROR counts, agreement, and verdict changes between decisive observations, which adds valuable behavioral context.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is three sentences with no filler: the first sentence states the core function, the second lists concrete use cases, and the third explicitly draws the boundary against the sibling tool. It is front-loaded and every sentence earns its place.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the simple parameter set, rich annotations, and the presence of an output schema, the description covers everything needed for selection and invocation. It explains the historical nature, when to use it, which sibling to prefer for live checks, and what evidence types can be inspected—leaving no material gaps.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100%, so the input schema already fully documents both parameters, including defaults, bounds, format, and role. The description adds little parameter-specific meaning beyond reinforcing that probe_id is 'returned by verify_http_claim' and that up to 20 observations can be returned, both of which are already in the schema.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description opens with a specific verb and resource: 'Retrieve up to 20 persisted observations for an existing Probe experiment ID'. It clearly distinguishes itself from the sibling by emphasizing this is historical evidence lookup, not a live verification, which makes the tool's purpose unmistakable.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description explicitly tells the agent when to use this tool: 'Use after verify_http_claim to inspect repeated results...' and when not to: 'use verify_http_claim when freshness or present endpoint behavior matters.' This provides clear decision criteria versus the only sibling tool.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
verify_http_claimVerify Live HTTP ClaimARead-onlyIdempotentInspect
Use this to verify a current public HTTPS claim by direct observation rather than web search, documentation, browser inference, or shell/curl. Use for explicit assertions that a GET/HEAD currently returns an expected HTTP status, exact header value, JSON value at a JSON Pointer, or body substring. It evaluates assertions, persists bounded evidence, reuses sufficiently fresh matching evidence, and summarizes recent observations. follow_redirects defaults to false; when true, Probe manually follows at most 3 validated HTTPS redirects. Every fetch uses redirect: manual. V0 supports only public HTTPS URLs without credentials, query strings, fragments, IP literals, or non-443 ports. Redirect validation is hostname/policy based; the Worker cannot guarantee protection against DNS rebinding between validation and platform DNS resolution.
| Name | Required | Description | Default |
|---|---|---|---|
| url | Yes | Public HTTPS URL to observe. V0 forbids credentials, query strings, fragments, IP literals, private or local destinations, and non-443 ports. | |
| method | No | HTTP method to observe. Use HEAD only when response headers and status are sufficient. | GET |
| assertions | Yes | One to eight explicit assertions evaluated against the same HTTP response. | |
| follow_redirects | No | Whether to follow up to three validated HTTPS redirects. Defaults to false. | |
| freshness_seconds | No | Maximum acceptable age of reusable matching evidence, in seconds. Public Probe V0 requires exactly 300. |
Output Schema
| Name | Required | Description |
|---|---|---|
| result | Yes | |
| summary | Yes | |
| protocol | Yes | |
| evidence_source | Yes | |
| evidence_age_seconds | Yes |
TDQS
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already signal read-only, open-world, and idempotent behavior, so the description adds substantial context beyond them: it evaluates assertions, persists bounded evidence, reuses sufficiently fresh matching evidence, summarizes recent observations, defaults follow_redirects to false, manually follows at most three validated HTTPS redirects, uses redirect: manual on every fetch, and warns about DNS rebinding limitations. This is exemplary behavioral disclosure.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is dense but every sentence contributes new information: purpose, assertion types, caching/evidence behavior, redirect mechanics, URL restrictions, and a security caveat. It is front-loaded with the primary use case and maintains a logical flow from high-level intent to low-level operational details without redundancy.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a tool with five parameters, a non-trivial assertion schema, and an output schema, the description covers all relevant operational context: why to use it, what assertions it supports, how redirects and evidence reuse behave, what URL forms are allowed, and a security limitation. Nothing essential to correct invocation is omitted.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100%, so each parameter is already documented in the schema. The description adds useful operational color, especially for follow_redirects ('Probe manually follows at most 3 validated HTTPS redirects') and for url constraints ('without credentials, query strings, fragments, IP literals, or non-443 ports'), but it does not need to and does not deeply elaborate on the assertion structure, since the schema already defines that.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
The description begins with a specific verb and resource: 'verify a current public HTTPS claim by direct observation.' It clearly enumerates the assertion types (HTTP status, exact header value, JSON value at a JSON Pointer, body substring) and explicitly contrasts itself with web search, documentation, browser inference, and shell/curl, making the tool's unique role unmistakable.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description gives explicit when-to-use guidance: 'Use for explicit assertions that a GET/HEAD currently returns...' and lists alternatives to avoid ('rather than web search, documentation, browser inference, or shell/curl'). It also conveys constraints on supported URLs and redirects. However, it does not directly address the sibling tool probe.history, leaving the boundary with historical evidence lookup implicit rather than explicit.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Tool Schema Changelog
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
2 tool updates
- Changed
probe.history3 fields changed- added
Input schema / properties / limit / descriptionAdded value: +"Maximum number of newest stored observations to return, from 1 through 20." - added
Input schema / properties / probe_id / descriptionAdded value: +"The 64-character lowercase hexadecimal Probe experiment ID returned by verify_http_claim." - changed
Output schema / (root)Previous value: -nullNew value: +{ + "$schema": "https://json-schema.org/draft/2020-12/schema", + "additionalProperties": false, + "properties": { + "observations": { + "items": { + "additionalProperties": false, + "properties": { + "assertion_results": { + "items": { + "anyOf": [ + { + "additionalProperties": false, + "properties": { + "actual": { + "type": "number" + }, + "expected": { + "type": "number" + }, + "kind": { + "const": "status", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "expected", + "actual", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "actual_fingerprint": { + "additionalProperties": false, + "properties": { + "sha256": { + "type": "string" + }, + "type": { + "type": "string" + } + }, + "required": [ + "type", + "sha256" + ], + "type": "object" + }, + "expected": { + "type": "string" + }, + "key": { + "type": "string" + }, + "kind": { + "const": "header_equals", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "actual_fingerprint", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "error_code": { + "type": "string" + }, + "expected": { + "type": "string" + }, + "key": { + "type": "string" + }, + "kind": { + "const": "header_equals", + "type": "string" + }, + "passed": { + "const": false, + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "passed", + "error_code" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "actual_fingerprint": { + "additionalProperties": false, + "properties": { + "sha256": { + "type": "string" + }, + "type": { + "type": "string" + } + }, + "required": [ + "type", + "sha256" + ], + "type": "object" + }, + "expected": {}, + "key": { + "type": "string" + }, + "kind": { + "const": "json_equals", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "actual_fingerprint", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "error_code": { + "type": "string" + }, + "expected": {}, + "key": { + "type": "string" + }, + "kind": { + "const": "json_equals", + "type": "string" + }, + "passed": { + "const": false, + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "passed", + "error_code" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "contains": { + "type": "boolean" + }, + "expected": { + "type": "string" + }, + "kind": { + "const": "body_contains", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "expected", + "contains", + "passed" + ], + "type": "object" + } + ] + }, + "type": "array" + }, + "body_sha256": { + "type": [ + "string", + "null" + ] + }, + "body_truncated": { + "type": "boolean" + }, + "bytes_observed": { + "type": "number" + }, + "error_code": { + "type": "string" + }, + "final_url": { + "type": "string" + }, + "latency_ms": { + "type": [ + "number", + "null" + ] + }, + "observed_at": { + "type": "string" + }, + "probe_id": { + "type": "string" + }, + "protocol": { + "const": "probe.evidence.v0", + "type": "string" + }, + "redirect_chain": { + "items": { + "additionalProperties": false, + "properties": { + "from_url": { + "type": "string" + }, + "hop": { + "type": "number" + }, + "location": { + "type": "string" + }, + "rejection": { + "type": "string" + }, + "resolved_url": { + "type": "string" + }, + "status_code": { + "type": "number" + }, + "validated": { + "type": "boolean" + } + }, + "required": [ + "hop", + "from_url", + "status_code", + "validated" + ], + "type": "object" + }, + "type": "array" + }, + "redirect_count": { + "type": "number" + }, + "redirects_followed": { + "type": "boolean" + }, + "status_code": { + "type": [ + "number", + "null" + ] + }, + "target": { + "additionalProperties": false, + "properties": { + "host": { + "type": "string" + }, + "method": { + "enum": [ + "GET", + "HEAD" + ], + "type": "string" + } + }, + "required": [ + "host", + "method" + ], + "type": "object" + }, + "termination": { + "type": "string" + }, + "verdict": { + "enum": [ + "PASS", + "FAIL", + "ERROR" + ], + "type": "string" + } + }, + "required": [ + "protocol", + "probe_id", + "observed_at", + "verdict", + "target", + "status_code", + "latency_ms", + "body_sha256", + "bytes_observed", + "body_truncated", + "assertion_results", + "redirects_followed", + "redirect_count", + "final_url", + "redirect_chain", + "termination" + ], + "type": "object" + }, + "type": "array" + }, + "probe_id": { + "type": "string" + }, + "protocol": { + "const": "probe.history.v0", + "type": "string" + }, + "summary": { + "additionalProperties": false, + "properties": { + "agreement": { + "type": [ + "number", + "null" + ] + }, + "changed_since_previous": { + "type": "boolean" + }, + "counts": { + "additionalProperties": false, + "properties": { + "ERROR": { + "type": "number" + }, + "FAIL": { + "type": "number" + }, + "PASS": { + "type": "number" + } + }, + "required": [ + "PASS", + "FAIL", + "ERROR" + ], + "type": "object" + }, + "dominant_verdict": { + "anyOf": [ + { + "enum": [ + "PASS", + "FAIL" + ], + "type": "string" + }, + { + "type": "null" + } + ] + }, + "observations": { + "type": "number" + } + }, + "required": [ + "observations", + "counts", + "dominant_verdict", + "agreement", + "changed_since_previous" + ], + "type": "object" + } + }, + "required": [ + "protocol", + "probe_id", + "observations", + "summary" + ], + "type": "object" +}
- Changed
verify_http_claim7 fields changed- added
Input schema / properties / assertions / descriptionAdded value: +"One to eight explicit assertions evaluated against the same HTTP response." - changed
Input schema / properties / assertions / items / oneOfPrevious value: -[ - { - "properties": { - "expected": { - "maximum": 599, - "minimum": 100, - "type": "integer" - }, - "kind": { - "const": "status", - "type": "string" - } - }, - "required": [ - "kind", - "expected" - ], - "type": "object" - }, - { - "properties": { - "expected": { - "maxLength": 1024, - "type": "string" - }, - "key": { - "maxLength": 80, - "minLength": 1, - "type": "string" - }, - "kind": { - "const": "header_equals", - "type": "string" - } - }, - "required": [ - "kind", - "key", - "expected" - ], - "type": "object" - }, - { - "properties": { - "expected": {}, - "key": { - "maxLength": 256, - "minLength": 1, - "type": "string" - }, - "kind": { - "const": "json_equals", - "type": "string" - } - }, - "required": [ - "kind", - "key", - "expected" - ], - "type": "object" - }, - { - "properties": { - "expected": { - "maxLength": 256, - "minLength": 1, - "type": "string" - }, - "kind": { - "const": "body_contains", - "type": "string" - } - }, - "required": [ - "kind", - "expected" - ], - "type": "object" - } -]New value: +[ + { + "properties": { + "expected": { + "description": "Expected HTTP status code from 100 through 599.", + "maximum": 599, + "minimum": 100, + "type": "integer" + }, + "kind": { + "const": "status", + "description": "Assert the HTTP response status code.", + "type": "string" + } + }, + "required": [ + "kind", + "expected" + ], + "type": "object" + }, + { + "properties": { + "expected": { + "description": "Exact expected response header value.", + "maxLength": 1024, + "type": "string" + }, + "key": { + "description": "Response header name to compare case-insensitively.", + "maxLength": 80, + "minLength": 1, + "type": "string" + }, + "kind": { + "const": "header_equals", + "description": "Assert an exact response header value.", + "type": "string" + } + }, + "required": [ + "kind", + "key", + "expected" + ], + "type": "object" + }, + { + "properties": { + "expected": { + "description": "Exact JSON value expected at the JSON Pointer." + }, + "key": { + "description": "JSON Pointer identifying the response value to compare, for example /status.", + "maxLength": 256, + "minLength": 1, + "type": "string" + }, + "kind": { + "const": "json_equals", + "description": "Assert an exact JSON value at a JSON Pointer.", + "type": "string" + } + }, + "required": [ + "kind", + "key", + "expected" + ], + "type": "object" + }, + { + "properties": { + "expected": { + "description": "Literal case-sensitive substring expected in the bounded response body.", + "maxLength": 256, + "minLength": 1, + "type": "string" + }, + "kind": { + "const": "body_contains", + "description": "Assert that the response body contains a literal substring.", + "type": "string" + } + }, + "required": [ + "kind", + "expected" + ], + "type": "object" + } +] - added
Input schema / properties / follow_redirects / descriptionAdded value: +"Whether to follow up to three validated HTTPS redirects. Defaults to false." - added
Input schema / properties / freshness_seconds / descriptionAdded value: +"Maximum acceptable age of reusable matching evidence, in seconds. Public Probe V0 requires exactly 300." - added
Input schema / properties / method / descriptionAdded value: +"HTTP method to observe. Use HEAD only when response headers and status are sufficient." - changed
Input schema / properties / url / descriptionPrevious value: -"Public HTTPS URL. V0 forbids credentials, query strings, redirects, IP literals, and non-443 ports."New value: +"Public HTTPS URL to observe. V0 forbids credentials, query strings, fragments, IP literals, private or local destinations, and non-443 ports." - changed
Output schema / (root)Previous value: -nullNew value: +{ + "$schema": "https://json-schema.org/draft/2020-12/schema", + "additionalProperties": false, + "properties": { + "evidence_age_seconds": { + "type": "number" + }, + "evidence_source": { + "enum": [ + "cached", + "fresh_execution" + ], + "type": "string" + }, + "protocol": { + "const": "probe.check.v0", + "type": "string" + }, + "result": { + "additionalProperties": false, + "properties": { + "assertion_results": { + "items": { + "anyOf": [ + { + "additionalProperties": false, + "properties": { + "actual": { + "type": "number" + }, + "expected": { + "type": "number" + }, + "kind": { + "const": "status", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "expected", + "actual", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "actual_fingerprint": { + "additionalProperties": false, + "properties": { + "sha256": { + "type": "string" + }, + "type": { + "type": "string" + } + }, + "required": [ + "type", + "sha256" + ], + "type": "object" + }, + "expected": { + "type": "string" + }, + "key": { + "type": "string" + }, + "kind": { + "const": "header_equals", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "actual_fingerprint", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "error_code": { + "type": "string" + }, + "expected": { + "type": "string" + }, + "key": { + "type": "string" + }, + "kind": { + "const": "header_equals", + "type": "string" + }, + "passed": { + "const": false, + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "passed", + "error_code" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "actual_fingerprint": { + "additionalProperties": false, + "properties": { + "sha256": { + "type": "string" + }, + "type": { + "type": "string" + } + }, + "required": [ + "type", + "sha256" + ], + "type": "object" + }, + "expected": {}, + "key": { + "type": "string" + }, + "kind": { + "const": "json_equals", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "actual_fingerprint", + "passed" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "error_code": { + "type": "string" + }, + "expected": {}, + "key": { + "type": "string" + }, + "kind": { + "const": "json_equals", + "type": "string" + }, + "passed": { + "const": false, + "type": "boolean" + } + }, + "required": [ + "kind", + "key", + "expected", + "passed", + "error_code" + ], + "type": "object" + }, + { + "additionalProperties": false, + "properties": { + "contains": { + "type": "boolean" + }, + "expected": { + "type": "string" + }, + "kind": { + "const": "body_contains", + "type": "string" + }, + "passed": { + "type": "boolean" + } + }, + "required": [ + "kind", + "expected", + "contains", + "passed" + ], + "type": "object" + } + ] + }, + "type": "array" + }, + "body_sha256": { + "type": [ + "string", + "null" + ] + }, + "body_truncated": { + "type": "boolean" + }, + "bytes_observed": { + "type": "number" + }, + "error_code": { + "type": "string" + }, + "final_url": { + "type": "string" + }, + "latency_ms": { + "type": [ + "number", + "null" + ] + }, + "observed_at": { + "type": "string" + }, + "probe_id": { + "type": "string" + }, + "protocol": { + "const": "probe.evidence.v0", + "type": "string" + }, + "redirect_chain": { + "items": { + "additionalProperties": false, + "properties": { + "from_url": { + "type": "string" + }, + "hop": { + "type": "number" + }, + "location": { + "type": "string" + }, + "rejection": { + "type": "string" + }, + "resolved_url": { + "type": "string" + }, + "status_code": { + "type": "number" + }, + "validated": { + "type": "boolean" + } + }, + "required": [ + "hop", + "from_url", + "status_code", + "validated" + ], + "type": "object" + }, + "type": "array" + }, + "redirect_count": { + "type": "number" + }, + "redirects_followed": { + "type": "boolean" + }, + "status_code": { + "type": [ + "number", + "null" + ] + }, + "target": { + "additionalProperties": false, + "properties": { + "host": { + "type": "string" + }, + "method": { + "enum": [ + "GET", + "HEAD" + ], + "type": "string" + } + }, + "required": [ + "host", + "method" + ], + "type": "object" + }, + "termination": { + "type": "string" + }, + "verdict": { + "enum": [ + "PASS", + "FAIL", + "ERROR" + ], + "type": "string" + } + }, + "required": [ + "protocol", + "probe_id", + "observed_at", + "verdict", + "target", + "status_code", + "latency_ms", + "body_sha256", + "bytes_observed", + "body_truncated", + "assertion_results", + "redirects_followed", + "redirect_count", + "final_url", + "redirect_chain", + "termination" + ], + "type": "object" + }, + "summary": { + "additionalProperties": false, + "properties": { + "agreement": { + "type": [ + "number", + "null" + ] + }, + "changed_since_previous": { + "type": "boolean" + }, + "counts": { + "additionalProperties": false, + "properties": { + "ERROR": { + "type": "number" + }, + "FAIL": { + "type": "number" + }, + "PASS": { + "type": "number" + } + }, + "required": [ + "PASS", + "FAIL", + "ERROR" + ], + "type": "object" + }, + "dominant_verdict": { + "anyOf": [ + { + "enum": [ + "PASS", + "FAIL" + ], + "type": "string" + }, + { + "type": "null" + } + ] + }, + "observations": { + "type": "number" + } + }, + "required": [ + "observations", + "counts", + "dominant_verdict", + "agreement", + "changed_since_previous" + ], + "type": "object" + } + }, + "required": [ + "protocol", + "evidence_source", + "evidence_age_seconds", + "result", + "summary" + ], + "type": "object" +}
2 tool updates
- First observed
probe.history - First observed
verify_http_claim
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