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path-solve

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Actualizado29 de mayo de 2026 a las 02:51

Concolic-lite path-constraint solving for hard-to-reach sinks. For findings /verify left inconclusive, the path-solver agent extracts the guard predicate between source and sink and solves it into a concrete reaching input — via the concolic MCP backend (Z3 / CrossHair) when installed, else by reasoning (LLM). Attaches a pathSolution block; feeds /verify and /fuzz. Heuristic, not a proof.

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Fuente

allsmog

allsmog/kuzushi-security-plugin

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SKILL.md

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name	path-solve
description	Concolic-lite path-constraint solving for hard-to-reach sinks. For findings /verify left inconclusive, the path-solver agent extracts the guard predicate between source and sink and solves it into a concrete reaching input — via the concolic MCP backend (Z3 / CrossHair) when installed, else by reasoning (LLM). Attaches a pathSolution block; feeds /verify and /fuzz. Heuristic, not a proof.
context	fork
agent	path-solver
user-invocable	false

Path solve

Get past the guards that left a sink unreachable.

Run node "${CLAUDE_PLUGIN_ROOT}/scripts/cmd/path-solve-prepare.mjs" --target "<repo root>" (optionally --input '{"fingerprints":["<fp>"]}' to target specific findings). If it reports no-candidates, tell the user to run /verify first (it surfaces the inconclusive findings worth solving) and stop.
Read the prep's prepPath. For each candidate, extract the path predicate between the source and sink (tree_sitter:node_at parent chain + tree_sitter:query for branch conditions across the functions on the path, using graphContext), then solve it: concolic:z3_solve for numeric/string predicates, concolic:crosshair for Python, else reason the input out (LLM). Decide reachable + a concrete solvedInput, or list the blocking guard in unsolvedGuards.
Write the { candidates: [...] } bundle to the prep's draftPath, then run the assembleCommand — it validates and attaches a pathSolution block onto each finding (no verdict change).
Report, per finding: guards extracted, backend used, reachable?, the solved input (or blocking guard). Note /verify can turn a reachable solution into a confirmed trigger and /fuzz can seed the corpus from it.

When NOT to use

Before /verify has produced inconclusive / needs-trace findings (nothing hard-to-reach) — unless you pass explicit fingerprints.
To render the exploitability verdict — that's /verify; this produces reach evidence.
For reachability that needs real symbolic execution of allocator/heap state — out of scope; this solves input predicates only.

Rationalizations to Reject

"An input was found, so it's exploitable." → That's reachable evidence at the stated confidence, not a proof; /verify + /poc adjudicate. Don't inflate confidence.
"That guard looks hard — unreachable." → Try Z3/CrossHair and a concrete assignment first; only reachable:false when a guard is genuinely unsatisfiable, and name it.
"Skip the predicate, just guess a payload." → The path predicate is the deliverable; a bare guess is what /verify already couldn't produce.

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name	path-solve
description	Concolic-lite path-constraint solving for hard-to-reach sinks. For findings /verify left inconclusive, the path-solver agent extracts the guard predicate between source and sink and solves it into a concrete reaching input — via the concolic MCP backend (Z3 / CrossHair) when installed, else by reasoning (LLM). Attaches a pathSolution block; feeds /verify and /fuzz. Heuristic, not a proof.
context	fork
agent	path-solver
user-invocable	false

Path solve

Get past the guards that left a sink unreachable.

Run node "${CLAUDE_PLUGIN_ROOT}/scripts/cmd/path-solve-prepare.mjs" --target "<repo root>" (optionally --input '{"fingerprints":["<fp>"]}' to target specific findings). If it reports no-candidates, tell the user to run /verify first (it surfaces the inconclusive findings worth solving) and stop.
Read the prep's prepPath. For each candidate, extract the path predicate between the source and sink (tree_sitter:node_at parent chain + tree_sitter:query for branch conditions across the functions on the path, using graphContext), then solve it: concolic:z3_solve for numeric/string predicates, concolic:crosshair for Python, else reason the input out (LLM). Decide reachable + a concrete solvedInput, or list the blocking guard in unsolvedGuards.
Write the { candidates: [...] } bundle to the prep's draftPath, then run the assembleCommand — it validates and attaches a pathSolution block onto each finding (no verdict change).
Report, per finding: guards extracted, backend used, reachable?, the solved input (or blocking guard). Note /verify can turn a reachable solution into a confirmed trigger and /fuzz can seed the corpus from it.

When NOT to use

Before /verify has produced inconclusive / needs-trace findings (nothing hard-to-reach) — unless you pass explicit fingerprints.
To render the exploitability verdict — that's /verify; this produces reach evidence.
For reachability that needs real symbolic execution of allocator/heap state — out of scope; this solves input predicates only.

Rationalizations to Reject

"An input was found, so it's exploitable." → That's reachable evidence at the stated confidence, not a proof; /verify + /poc adjudicate. Don't inflate confidence.
"That guard looks hard — unreachable." → Try Z3/CrossHair and a concrete assignment first; only reachable:false when a guard is genuinely unsatisfiable, and name it.
"Skip the predicate, just guess a payload." → The path predicate is the deliverable; a bare guess is what /verify already couldn't produce.