docs: add MCP tool limitations, report_feedback example, and description quality guidelines#112
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…ion quality guidelines ## What this PR does Adds comprehensive Limitations documentation for all 5 MCP tools based on verified testing and schema analysis. Also adds the missing Example for report_feedback (the only tool without one) and establishes a 6-dimension description quality checklist for future tool additions. ## Changes ### SKILL.md — MCP Tools Reference (new section) - Common Limitations: authentication, daily quota, network dependency - search_source: 200 max results, keyword substring matching behavior, space-in-keyword pitfall, domain substring matching, no boolean operators - get_source: silent error behavior (isError:false with error objects), recommended batch size - ask_agent: query constraints, non-idempotent, 2-8s response time, web_search trigger warning - get_access_guide: incomplete instruction coverage, 3-20s response time, operation specificity requirement - report_feedback: message length, non-idempotent, two usage examples (broken link + outdated content) ### Description Quality Guidelines (new section) - Core principle: 'Write it right before writing it all' - 6-dimension checklist for PR review ### mcp-tool-descriptions-draft.md (new file) - Server-side description text ready to paste into Python code - Verification evidence table with test results and schema references ## Verification Evidence Every limitation is backed by schema analysis or live testing: - search_source limit 200: inputSchema maximum:200 - Keywords not auto-tokenized: tested ['中国 GDP']→0, ['中国','GDP']→173 - get_source silent error: tested invalid ID returns error object, isError:false - ask_agent timing: 3 runs measured 1.8s, 2.9s, 7.4s - get_access_guide timing: 3 runs measured 3.0s, 17.6s, 19.1s - Token quota: TokenVerifyResponse schema has quota_allowed/remaining_daily - Trial quota 30/day: verified via /api/trial/session-info ## 6-Dimension Self-Assessment (post-change) | Dimension | search_source | get_source | ask_agent | get_access_guide | report_feedback | |-----------|:---:|:---:|:---:|:---:|:---:| | Purpose | ✅ | ✅ | ✅ | ✅ | ✅ | | Guidelines | ✅ | ✅ | ✅ | ✅ | ✅ | | Examples | ✅ | ✅ | ✅ | ✅ | ✅ (NEW) | | Limitations | ✅ (NEW) | ✅ (NEW) | ✅ (NEW) | ✅ (NEW) | ✅ (NEW) | | Parameters | ✅ | ✅ | ✅ | ✅ | ✅ | | Return Format | ✅ | ✅ | ✅ | ✅ | ✅ | Target: 5/5 tools × 6/6 dimensions = 30/30 ✅ Refs: MCP Search Quality Research #5, arXiv 2602.14878, arXiv 2602.18914
mingcha-dev
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Mar 31, 2026
Address review feedback:
1. Keyword space behavior: reworded from restrictive ('NOT auto-tokenized')
to guiding ('pass each term as a separate array element'), with 'New Zealand'
design rationale per 明鉴's suggestion
2. Token quota: added explicit note that no client-facing API exists to query
remaining quota at runtime, per 明鉴's question
firstdata-dev
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Mar 31, 2026
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✅ LGTM. MCP 工具文档质量提升——5 个工具全部补充 Limitations，report_feedback 补了 Example，6 维度自评 30/30。
基于真实测试数据（schema 分析 + API 调用验证），文档质量很扎实。建议合并。
Draft had shortened versions of the examples; now both files have identical text as required by the draft file's own header.
1. Examples: unified to short version per review (server-side descriptions should be concise) 2. Quota: replaced 'no client-facing API' with actual mechanism — Token verification API (POST /api/token/verify) returns remaining_daily, but this is a separate HTTP call, not available via MCP tool invocation
Critical fix: - Multiple keywords use OR logic, NOT AND. Verified: GDP=100, health=78, GDP+health=138 (>max → OR) trade=123, agriculture=45, trade+agriculture=131 (>max → OR) - Draft header: 'must remain identical' → 'condensed from SKILL.md, semantics must match' - Added OR logic verification to evidence table
Per 明鉴 review: Agent needs response time info for all tools, not just the slow ones, to make informed tool selection decisions.
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What this PR does
Adds comprehensive Limitations documentation for all 5 MCP tools based on verified testing and schema analysis. Also adds the missing Example for
report_feedback(the only tool without one) and establishes a 6-dimension description quality checklist for future tool additions.Background: MCP Search Quality Research #5 found 97.1% of MCP tool descriptions contain at least one 'smell'. FirstData scored well on Purpose/Guidelines/Examples but had a systematic gap in Limitations (0.5/5). This PR fixes that.
Changes
SKILL.md — MCP Tools Reference (new section)
isError:falsewith error objects), recommended batch size ≤20Description Quality Guidelines (new section)
mcp-tool-descriptions-draft.md (new file)
Verification Evidence
Every limitation is backed by schema analysis or live API testing:
maximum: 200["中国 GDP"]→ 0 results;["中国", "GDP"]→ 173 results["中国GDP"]→ 1 result;["GDP"]→ 100 results{"error":"Not found"}withisError: falsequota_allowed,remaining_daily/api/trial/session-info:total_calls: 306-Dimension Self-Assessment (post-change)
Target: 30/30 ✅
Deployment Note
This PR updates documentation only (SKILL.md). The server-side MCP tool descriptions need a separate deployment — the exact text is provided in
mcp-tool-descriptions-draft.mdfor copy-paste into server code after review approval.Refs: arXiv 2602.14878, arXiv 2602.18914