locking-semantics

An audit check for locking rules in DAML, a language and platform for applications whose records are shared between parties. It looks for assets marked as locked and checks that every operation respects that lock and preserves the asset’s value.

In plain words
What is it for?
Listing how locks are created and cleared, checking transfers, splits, merges, and archiving while an asset is locked, and verifying that the lock-to-unlock process keeps the same value.
Why use it?
DAML has no built-in lock command, so developers often model locks with fields or wrapper records. This check helps find paths that move a locked asset or accidentally remove its lock status.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/plamentsv/plamen/locking-semantics
Any agent
npx skills add PlamenTSV/plamen --skill locking-semantics
Clone the repo
git clone --depth 1 https://github.com/PlamenTSV/plamen

Made for: Claude Code, Codex.

Per session 38 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,427 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00038 $0.01427
Opus 5 $0.00019 $0.00714
Sonnet 5 $0.00008 $0.00285
Haiku 4.5 $0.00004 $0.00143

Measured 2d ago against content hash 2fc882ed5f15, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

locking-semantics scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

agents/skills/daml/locking-semantics/SKILL.md · 86 lines

How it starts

The opening of the file, as written. The whole thing — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.

LOCKING_SEMANTICS Skill (DAML)

Trigger Pattern: Always required for DAML audits — self-skip if no lock pattern present Inject Into: Breadth agents, depth-state-trace, depth-edge-case Finding prefix: [DML-LK-N] Rules referenced: R8, R10, R14

DAML has no native lock primitive; locking is emulated by a template field (locked : Bool, lockedUntil : Time, a held lock contract, or a separate Locked template wrapping the asset). The invariant is: while locked, the asset MUST NOT be split, merged, transferred, or archived through any path; and the value MUST be conserved across the lock→unlock cycle. The two high-yield bugs are lock-bypass (a choice that moves the asset ignores the lock field) and lock-erase (a choice recreates the asset successor dropping the locked field). If no template carries a lock field / lock wrapper, this skill self-skips.

1. Lock-State Inventory

Identify every lock mechanism and the asset it protects:

Template Lock Mechanism Lock Field/Wrapper Set By (choice) Cleared By (choice) Asset Protected
{T} bool field / time field / Locked wrapper {locked / lockedUntil} {choice} {choice} {asset field}

DAML note: A lock encoded as a plain Bool/Time field on the asset template is only honored if EVERY value-moving choice reads it. A lock encoded as a separate wrapper template is only honored if the underlying asset cannot be exercised directly while wrapped.

2. Lock-Honoring Audit (lock-bypass)

For EVERY value-moving choice on a lockable template, verify it checks the lock:

Template.Choice Moves/Splits/Merges/Archives Asset? Reads Lock Field? Lock Check Expr Bypassable?
{T.C} YES/NO YES/NO assertMsg "locked" (not locked) / NONE [DML-LK-N] if moves while locked

Read the full file on GitHub · 86 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago First seen · 86 lines · 38 tokens per session scan A 2fc882ed5f15

Subscribe to this mod's changes

locking-semantics is a skill published in the GitHub repository PlamenTSV/plamen (281 stars, last pushed 1mo ago), licensed MIT. It adds 38 tokens to every session and 1,427 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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