Gitnexus Debugging

abhigyanpatwari/gitnexus/gitnexus-claude-plugin/skills/gitnexus-debugging

作者 abhigyanpatwariff922c0a3b0c無授權條款47K 個星標收錄於 2026年10月8日更新於 2026年10月8日儲存庫今天更新

Use when the user is debugging a bug, tracing an error, or asking why something fails. Examples: "Why is X failing?", "Where does this error come from?", "Trace this bug"

僅含說明Software Development

AI 產生的概覽

指導使用 GitNexus 程式碼索引 MCP 工具除錯並追蹤錯誤根因。

功能: 此技能提供一套透過 GitNexus MCP 工具排查缺陷、錯誤與異常行為的工作流程。內容涵蓋綁定正確的已索引儲存庫、依錯誤文字查詢、檢視呼叫端與被呼叫端、追蹤執行流程與呼叫鏈，並在原始碼中確認根因。產出結論時會說明所用儲存庫與索引新鮮度，並附有症狀對應方法和一個 500 錯誤的完整範例。
適用情境: 當使用者詢問某功能為何失敗、錯誤來自何處、誰呼叫了某方法，或希望追蹤缺陷與異常行為時使用。適用於間歇性失敗、傳回值錯誤、效能問題與近期回歸。
執行需求: 需要 GitNexus MCP 伺服器及其工具（list_repos、query、context、cypher、trace、detect_changes）以及一個已索引的儲存庫；僅為說明文件，不含指令碼。

Debugging with GitNexus

When to Use

"Why is this function failing?"
"Trace where this error comes from"
"Who calls this method?"
"This endpoint returns 500"
Investigating bugs, errors, or unexpected behavior

Bind the repository first

A root cause traced in the wrong repository is a wrong root cause.

Call list_repos {} before the first tool call. With one indexed repository, use the examples below as written. With more than one, pass repo on every call: an omitted repo normally errors, but under an MCP policy with a configured default it resolves to that default silently. If you cannot tell which repository is meant, stop and ask. This matters most for cypher, whose statement carries no in-band hint of which database it ran against.

list_repos is paginated, so page with offset: pagination.nextOffset until hasMore is false before concluding a repository is absent.

A stale index describes the code from before your bug, so refresh before trusting a trace, and state the repository and index freshness with the diagnosis.

Workflow

0. list_repos {}                                          → Bind repo1. query({search_query: "<error or symptom>"})            → Find related execution flows2. context({name: "<suspect>"})                    → See callers/callees/processes3. READ gitnexus://repo/{name}/process/{name}                → Trace execution flow4. cypher({statement: "MATCH path..."})                 → Custom traces if needed

0. list_repos {}                                          → Bind repo1. query({search_query: "<error or symptom>"})            → Find related execution flows2. context({name: "<suspect>"})                    → See callers/callees/processes3. READ gitnexus://repo/{name}/process/{name}                → Trace execution flow4. cypher({statement: "MATCH path..."})                 → Custom traces if needed

If "Index is stale" → run node .gitnexus/run.cjs analyze in terminal. Hot-tool staleness names which index answered (branch/lastCommit) and how fresh it is (status). Re-analyze only for behind or diverged — current is identity, unknown is unmeasurable.

Checklist

- [ ] list_repos {} — bind repo; explicit repo when >1 indexed, ask if ambiguous- [ ] Understand the symptom (error message, unexpected behavior)- [ ] query for error text or related code- [ ] Identify the suspect function from returned processes- [ ] context to see callers and callees- [ ] Trace execution flow via process resource if applicable- [ ] cypher for custom call chain traces if needed- [ ] Read source files to confirm root cause- [ ] State the repository and index freshness with the diagnosis

- [ ] list_repos {} — bind repo; explicit repo when >1 indexed, ask if ambiguous- [ ] Understand the symptom (error message, unexpected behavior)- [ ] query for error text or related code- [ ] Identify the suspect function from returned processes- [ ] context to see callers and callees- [ ] Trace execution flow via process resource if applicable- [ ] cypher for custom call chain traces if needed- [ ] Read source files to confirm root cause- [ ] State the repository and index freshness with the diagnosis

Debugging Patterns

Symptom	GitNexus Approach
Error message	`query` for error text → `context` on throw sites
Wrong return value	`context` on the function → trace callees for data flow
Intermittent failure	`context` → look for external calls, async deps
Performance issue	`context` → find symbols with many callers (hot paths)
Recent regression	`detect_changes` to see what your changes affect — pass `worktree` for a linked worktree
"How does A reach B?"	`trace` between the two symbols — shortest call chain in one call

Tools

query — find code related to error:

query({search_query: "payment validation error", repo: "my-app"})→ Processes: CheckoutFlow, ErrorHandling→ Symbols: validatePayment, handlePaymentError, PaymentException

query({search_query: "payment validation error", repo: "my-app"})→ Processes: CheckoutFlow, ErrorHandling→ Symbols: validatePayment, handlePaymentError, PaymentException

context — full context for a suspect:

context({name: "validatePayment", repo: "my-app"})→ Incoming calls: processCheckout, webhookHandler→ Outgoing calls: verifyCard, fetchRates (external API!)→ Processes: CheckoutFlow (step 3/7)

context({name: "validatePayment", repo: "my-app"})→ Incoming calls: processCheckout, webhookHandler→ Outgoing calls: verifyCard, fetchRates (external API!)→ Processes: CheckoutFlow (step 3/7)

cypher — custom call chain traces. Pass repo alongside the statement; the Cypher text itself names no repository, so the result is unattributable without it:

cypher

MATCH path = (a)-[:CodeRelation {type: 'CALLS'}*1..2]->(b:Function {name: "validatePayment"})RETURN [n IN nodes(path) | n.name] AS chain

MATCH path = (a)-[:CodeRelation {type: 'CALLS'}*1..2]->(b:Function {name: "validatePayment"})RETURN [n IN nodes(path) | n.name] AS chain

trace — shortest call chain between two symbols ("how does A reach B?"), one call instead of chaining context hops:

trace({ from: "processCheckout", to: "fetchRates", repo: "my-app" })→ status: ok, hopCount: 3→ hops: processCheckout → validatePayment → verifyCard → fetchRates→ edges: CALLS (1.0), CALLS (0.95), CALLS (1.0)

trace({ from: "processCheckout", to: "fetchRates", repo: "my-app" })→ status: ok, hopCount: 3→ hops: processCheckout → validatePayment → verifyCard → fetchRates→ edges: CALLS (1.0), CALLS (0.95), CALLS (1.0)

When no path exists, trace reports the furthest reachable node — exactly where the chain breaks (dynamic dispatch, reflection, or an external boundary).

Example: "Payment endpoint returns 500 intermittently"

0. list_repos {}   → total: 2 (my-app, billing-api) — bind my-app explicitly on every call
1. query({search_query: "payment error handling", repo: "my-app"})   → Processes: CheckoutFlow, ErrorHandling   → Symbols: validatePayment, handlePaymentError
2. context({name: "validatePayment", repo: "my-app"})   → Outgoing calls: verifyCard, fetchRates (external API!)
3. READ gitnexus://repo/my-app/process/CheckoutFlow   → Step 3: validatePayment → calls fetchRates (external)
4. Root cause: fetchRates calls external API without proper timeout   Repository: my-app  Index: current

0. list_repos {}   → total: 2 (my-app, billing-api) — bind my-app explicitly on every call
1. query({search_query: "payment error handling", repo: "my-app"})   → Processes: CheckoutFlow, ErrorHandling   → Symbols: validatePayment, handlePaymentError
2. context({name: "validatePayment", repo: "my-app"})   → Outgoing calls: verifyCard, fetchRates (external API!)
3. READ gitnexus://repo/my-app/process/CheckoutFlow   → Step 3: validatePayment → calls fetchRates (external)
4. Root cause: fetchRates calls external API without proper timeout   Repository: my-app  Index: current

With a single indexed repository, step 0 returns total: 1 and the repo argument drops out of every call above.

來源與署名

來源：abhigyanpatwari/gitnexus位於gitnexus-claude-plugin/skills/gitnexus-debugging提交ff922c0

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Gitnexus Debugging

Debugging with GitNexus

When to Use

Bind the repository first

Workflow

Checklist

Debugging Patterns

Tools

Example: "Payment endpoint returns 500 intermittently"

來源與署名

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