Kaal Corpus: Verifiable Claim Layer
https://corpus.openstanding.org/mcp ↗
Kaal Corpus: Verifiable Claim Layer is a remote MCP server published at corpus.openstanding.org. It has been probed 32 times since 9/4/2026. It answered in 32 of them (100.0%), a near-uninterrupted record. Median response time is 796 ms, a delay an agent will notice. It exposes a broad tool surface of 18 tools. On the protocol side it still runs 2025-11-25 and has not moved to the newer spec.
Cite the claim, not the paper: 5,033 assertions, each hash-verifiable against its source PDF
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Strengths
- Clear tool naming for most functions
- Detailed descriptions for use cases
- Explicit parameters for critical operations
Weaknesses
- Ambiguous parameters in research claim/observation tools
- Overlapping search functions for claims vs positions
- Insufficient error handling for invalid inputs
search_research_claims— Ambiguous parameter requirementslist_research_observations— Unclear parameter constraintssearch_claims— Overlaps with search_positions functionality
Verdict
Event narrative
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| Run | Era | Modern | ms | Legacy | ms |
|---|
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test passed (list_research_observations, 416ms)
- Cold-start: cold 176ms → warm 182ms (penalty 0ms)
Era history
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: — → 1.28.1
- Supported versions: — → 2025-11-25
- Era changed: Unknown → Legacy
- Supported versions: 2025-11-25 → —
- Era changed: Legacy → Unknown
- Server build: — → 1.28.1
- Supported versions: — → 2025-11-25
- Era changed: Unknown → Legacy
- Supported versions: 2025-11-25 → —
- Era changed: Legacy → Unknown
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