Phx Recall

Recall — Session & History Archaeology

Search three evidence layers, cheapest first, to answer "have we solved

this before?". Stop at the first layer that answers the question.

Usage

$elixir-phoenix:phx-recall how did we fix the LiveView form that saved silently?
$elixir-phoenix:phx-recall what did we decide about the billing context boundaries?
$elixir-phoenix:phx-recall which library did we pick for rate limiting and why?

Iron Laws

• Cheapest layer first — solution docs (local grep) → git history →

session transcripts. Don't fetch sessions when a solution doc answers

• ONE ccrider fetch = ONE subagent — get_session_messages responses

are 3–15KB each. Spawn a subagent per session that writes a summary

file and exits; NEVER batch multiple session fetches into one context

• Cite the evidence — every claim names its source (solution doc

path, commit hash, or session date + match snippet). No vague "we did

this once"

• Graceful degradation, stated plainly — if ccrider MCP is absent,

say so once and use the fallback layers; never error out

Workflow

Layer 1: Compound Solution Docs (always)

Run Grep with keywords from the question over .claude/solutions/.

Treat a hit here as the best answer — it was written for exactly this

purpose. Present it and stop unless the user wants more.

Layer 2: Git Archaeology (always available)

git log --oneline --grep="{keyword}" -i -20      # commit messages
git log -S "{code-symbol}" --oneline -10          # when a symbol changed
git log --follow --oneline -10 -- {file}          # one file's history
git show {hash} --stat                            # inspect a candidate

Use -S (pickaxe) when the question names code; --grep when it names

intent. Show matching commits with one-line context each.

Layer 3: Session Transcripts (ccrider MCP, gated)

Check for mcp__ccrider__* tools (load via ToolSearch if deferred).

If absent: report "ccrider MCP not connected — answered from solution

docs + git history" and stop after Layers 1–2.

If present:

• mcp__ccrider__search_sessions with the question's key phrases —

returns ranked hits with session IDs and snippets

• Present the top 3–5 hits (date, snippet) and pick the most relevant

(or ask, if genuinely ambiguous)

• Per selected session, spawn ONE subagent: "Fetch session {id} via

mcp__ccrider__get_session_messages, extract only what answers

'{question}', write ≤30 lines to .claude/recall/{id}.md" (Iron Law 2)

• Read the summary files, synthesize the answer with citations

Step 4: Answer + Compound

Present the answer with its evidence trail. If the recalled knowledge was

NOT already in .claude/solutions/, offer $elixir-phoenix:phx-compound so the next

recall stops at Layer 1.

Integration

"have we done this before?" → $elixir-phoenix:phx-recall
   Layer 1 .claude/solutions/ ──hit──► answer + cite
   Layer 2 git log --grep/-S  ──hit──► answer + cite
   Layer 3 ccrider sessions (gated) ─► answer + cite → offer $elixir-phoenix:phx-compound

References

• references/archaeology-patterns.md — git pickaxe recipes, ccrider query patterns, subagent prompt template