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.
npx skills add PlamenTSV/plamen --skill instruction-introspectiongit clone --depth 1 https://github.com/PlamenTSV/plamenWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/plamentsv/plamen/instruction-introspection)<a href="https://agentmods.dev/skills/plamentsv/plamen/instruction-introspection"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/instruction-introspection/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/plamentsv/plamen/instruction-introspection"><img src="https://agentmods.dev/badge/skills/plamentsv/plamen/instruction-introspection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00034 | $0.01141 |
| Opus 5 | $0.00017 | $0.00571 |
| Sonnet 5 | $0.00007 | $0.00228 |
| Haiku 4.5 | $0.00003 | $0.00114 |
Grade A, and why
instruction-introspection 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
INSTRUCTION_INTROSPECTION Skill
Trigger Pattern: INSTRUCTION_INTROSPECTION flag detected (load_instruction_at/Sysvar1nstructions) Inject Into: Breadth agents, depth agents Finding prefix:
[II-N]Rules referenced: S10, S8, R15
For every use of instruction introspection in the Solana program:
1. Introspection Usage Inventory
List all instruction introspection usage:
| # | Location | Function Used | Purpose | Instructions Sysvar Source |
|---|---|---|---|---|
| 1 | {file:line} | load_instruction_at_checked / load_instruction_at / get_instruction_relative |
{what it checks} | {account source} |
2. Sysvar Address Validation (Wormhole Pattern - CRITICAL)
For each Instructions sysvar account:
| Usage | Sysvar Source | Address Validated? | Validation Method |
|---|---|---|---|
| {usage} | {account param name} | YES/NO | {hardcoded check / Anchor constraint / NONE} |
Attack pattern (sysvar address spoofing): If Instructions sysvar address is NOT validated, attacker passes a fake account containing crafted "instruction" data. The introspection reads attacker-controlled data instead of real transaction instructions.
Defense: require!(sysvar_account.key() == sysvar::instructions::ID) or use Anchor #[account(address = sysvar::instructions::ID)].
3. Checked Function Usage
For each load_instruction_at* call:
| Call | Uses _checked Variant? |
Risk if Unchecked |
|---|---|---|
| {call} | YES/NO | {if NO: deprecated function, potential ABI issues} |
Rule: Always use load_instruction_at_checked (validates the sysvar account) over the deprecated load_instruction_at (does not validate).
4. Instruction Sequence Validation
For flash loan and atomic operation patterns:
| Pattern | Borrow Instruction Checked? | Repay Instruction Checked? | Gap Between Checks? |
|---|---|---|---|
| Flash loan repay check | YES/NO | YES/NO | {can attacker insert instructions between borrow and repay?} |
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.
- 7d ago First seen · 100 lines · 34 tokens per session scan A 0e3030cc9195
instruction-introspection is a skill published in the GitHub repository PlamenTSV/plamen (295 stars, last pushed 2d ago), licensed MIT. It adds 34 tokens to every session and 1,141 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 2026-09-03.
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