predict

Before running the next side-effecting tool call, write down what you expect to observe. The prediction is recorded in the belief-store and reconciled with the actual observation after the tool runs.

When to use

• ALWAYS before Bash, Edit, Write, NotebookEdit, or any tool with side effects.
• OPTIONAL before Read / Grep / Glob if the expected content materially affects your plan (e.g. "I expect this file to contain function foo"). For pure exploration reads, skip.

How to use

1. Decide the action you are about to take.
2. State explicitly, in one or two lines each:
   • action — short description ("Edit src/auth.ts: add null-check on line 42")
   • expected — the specific, FALSIFIABLE observation you predict
   • confidence — 0..1, ordinal (not probabilistic)
3. Call the belief-store.store_prediction MCP tool with those fields, plus:
   • task_id — the current task card's id (from the Cartographer)
   • tool_name — the exact tool name you will invoke ("Bash", "Edit", …)
   • tool_input_hash — optional; lets the hook disambiguate when multiple predictions target the same tool
4. Then issue the tool call.

The PostToolUse hook automatically reconciles your prediction with the actual result and computes a surprise score. You do NOT need to call record_observation yourself.

Good vs bad predictions

Bad (unfalsifiable)	Good (falsifiable)
"The tests will pass."	"pytest -q prints 14 passed and exits 0 in under 5s."
"The file will have my changes."	"grep -n 'null-check' src/auth.ts matches line 42."
"It should work."	"tsc --noEmit prints no errors."
"Something will be returned."	"The function returns {ok: true, id: string} with id length 36."

If you cannot state a falsifiable prediction, your confidence should be low and you should consider /probe first to ground the belief before committing to the action.

Arguments

• $ARGUMENTS — the action you are about to take (free text).

Your response should:

1. Produce the predicted observation in natural language.
2. Call belief-store.store_prediction with the structured fields.
3. State the returned action_id so downstream reconciliation can cite it.