Borrowing it
Nothing to install: this file belongs to Sceptre/sceptre-mcp-server. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/Sceptre/sceptre-mcp-server/main/.kiro/steering/error-handling.mdgit clone --depth 1 https://github.com/Sceptre/sceptre-mcp-serverWrote 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/instructions/sceptre/sceptre-mcp-server/error-handling)<a href="https://agentmods.dev/instructions/sceptre/sceptre-mcp-server/error-handling"><img src="https://agentmods.dev/badge/instructions/sceptre/sceptre-mcp-server/error-handling/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/instructions/sceptre/sceptre-mcp-server/error-handling"><img src="https://agentmods.dev/badge/instructions/sceptre/sceptre-mcp-server/error-handling.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00205 | $0.00205 |
| Opus 5 | $0.00102 | $0.00102 |
| Sonnet 5 | $0.00041 | $0.00041 |
| Haiku 4.5 | $0.00020 | $0.00020 |
Grade A, and why
sceptre-mcp-server error-handling.md 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 4d 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.
What it actually says
Error Handling
Principles
- Handle errors explicitly at every level
- Use specific exception types, never bare
except: - Fail fast with clear, actionable error messages
- Never silently swallow errors
- Log error context before re-raising
Patterns
- Use custom exception classes for domain errors
- Return structured error responses from APIs (
{ error, message, details }) - Use early returns to handle error cases first, keep happy path unindented
- Wrap external calls (APIs, DB, file I/O) in try/except with specific exceptions
- Include correlation IDs in error responses for traceability
Anti-Patterns
- Bare
except:orexcept Exception:without re-raising - Catching and ignoring errors silently
- Returning
Noneto signal errors instead of raising - Leaking stack traces or internal details in user-facing errors
- Using exceptions for control flow
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.
- 4d ago First seen · 28 lines · 205 tokens per session scan A c353ecbf0df1
sceptre-mcp-server error-handling.md is an instructions file published in the GitHub repository Sceptre/sceptre-mcp-server (0 stars, last pushed 5d ago), licensed Apache-2.0. It adds 205 tokens to every session, about $0.0010 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 2026-09-08.
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