explore-area

name	explore-area
description	Orient on a new codebase area using get_context for token-budgeted exploration. Use when the user asks "what does this module do", "explain this part", or wants to understand an unfamiliar area before making changes.
user-invocable	true
arguments	<query or concept>
allowed-tools	mcp__julie__get_context, mcp__julie__fast_search, mcp__julie__deep_dive, mcp__julie__get_symbols, mcp__julie__call_path, mcp__julie__spillover_get, mcp__julie__manage_workspace

Explore Area

Orient on an unfamiliar area of the codebase using Julie's get_context tool. This is the recommended starting point before any modification task — understand the area first, then dive in.

Process

Step 1: Get Token-Budgeted Context

get_context(query="<area, concept, or module name>")

Conceptual queries work well here, not just symbol names. For example, get_context(query="error handling and retries") will find relevant symbols by meaning via semantic search.

For a quick concept-to-symbol probe before expanding context, use fast_search(query="...", backend="semantic") or backend="hybrid". Those backends return symbol-backed hits only; use explicit backend="lexical" for file names, path fragments, or pure lexical comparison. Omitting backend is normal search and may show a labeled semantic fallback only when an identifier-like unscoped lexical query returns zero hits and embeddings are ready.

This returns:

• Pivots: The most relevant symbols with full code bodies
• Neighbors: Connected symbols with signatures only
• File map: Which files contain which symbols

The output is automatically token-budgeted — few results get deep context, many results get broad overview.

Step 1a: Bias with task inputs (optional)

get_context accepts task-shaped inputs that bias pivot selection and neighbor ranking toward what the user is actually working on. Mix and match as relevant:

• edited_files=[...] — boost pivots and neighbors in those files. Use when the user has changes in progress and wants context around them.
• entry_symbols=[...] — explicit symbol entry points the user cares about. Pins those symbols as pivots even if search scoring wouldn't have surfaced them.
• stack_trace="..." — paste a stack trace; file:line references inside get parsed and bias pivot selection toward the frames involved.
• failing_test="<test file or test symbol>" — boost production symbols linked to that test via the test-linkage graph. Great for "why is this test failing?" orientation.
• max_hops=2 — allow bounded second-hop expansion when first-hop is thin (fewer than 4 code neighbors). Default is 1. Use for sparsely-connected areas where the immediate neighborhood isn't enough.
• prefer_tests=true — let test-linked symbols compete for neighbor slots alongside production callers. Default is false (tests stay out of the neighbor budget). Flip on when the user is writing or debugging tests.

Example — task-shaped usage combining several inputs:

get_context(query="error handling in request path",
            edited_files=["src/handler.rs"],
            failing_test="test_request_rejects_invalid_auth",
            max_hops=2)

Step 2: Identify Key Symbols

From the pivots, identify:

• Entry points: Public functions/methods that external code calls (high centrality score)
• Core types: Structs, enums, traits that define the area's data model
• Utilities: Private helpers that support the entry points

Centrality scores in the output indicate how well-connected each symbol is — high-centrality symbols are the important ones.

Step 3: Drill Into Key Symbols (Optional)

For pivots that need more context (e.g., you need to see callers/callees):

deep_dive(symbol="<key_symbol>", depth="overview")

Use context_file if the symbol name is ambiguous:

deep_dive(symbol="<symbol>", depth="overview", context_file="<partial_path>")

Step 3b: Trace a concrete path when the question is about reachability

If the user asks a path-shaped question, use call_path instead of trying to reconstruct the route by hand:

call_path(from="<entry_or_caller>", to="<sink_or_dependency>")

Use from_file_path and to_file_path when shared names make either endpoint ambiguous.

Step 4: Check File Structure (Optional)

For files with many symbols that weren't fully covered by get_context:

get_symbols(file_path="<file>", mode="structure", max_depth=1)

This shows the full outline without reading the file contents.

Step 5: Report

Area: <concept/module>

Key Entry Points:
  - function_a (src/module.rs:45) — centrality: high
    Purpose: <what it does>
  - function_b (src/module.rs:120) — centrality: medium
    Purpose: <what it does>

Core Types:
  - StructA (src/types.rs:10) — <what it represents>
  - TraitB (src/traits.rs:5) — <what it defines>

File Map:
  src/module.rs — main implementation (function_a, function_b, helpers)
  src/types.rs — data types (StructA, EnumC)
  src/traits.rs — trait definitions (TraitB)

Dependency Flow:
  External callers → function_a → helper_1 → database queries
                   → function_b → TraitB implementations

Suggested Starting Point:
  <which file/function to read first for this task>

Tips

• Use format: "readable" for human-friendly output with section separators and richer formatting:

  get_context(query="...", format="readable")
  

  The default format is compact (optimized for AI agent consumption).
• Use max_tokens to control budget if the default is too much or too little:

  get_context(query="...", max_tokens=1000)
  

• Filter by language or file pattern to narrow scope:

  get_context(query="...", language="rust", file_pattern="src/tools/**")
  

• Use call_path for one concrete route, not general impact:

  call_path(from="RequestHandler::handle", to="persist_session")
  

  Reach for blast_radius when the real question is "what would this change affect?"
• Cross-workspace: Call manage_workspace(operation="open", path="<path>") first, then pass the returned workspace_id to all tool calls

Paging long neighbor lists

For broad queries, get_context may return spillover_handle=gc_xxx in its response when the neighbor list didn't fit in the first page. Fetch the rest without re-running the query:

spillover_get(spillover_handle="gc_xxx")

Keep paging until the handle stops appearing. The same mechanism backs blast_radius spillovers (br_xxx).