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 agentmods add agents/zhensherlock/sp500-mcp-server/mcp-tool-developergit clone --depth 1 https://github.com/zhensherlock/sp500-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/agents/zhensherlock/sp500-mcp-server/mcp-tool-developer)<a href="https://agentmods.dev/agents/zhensherlock/sp500-mcp-server/mcp-tool-developer"><img src="https://agentmods.dev/badge/agents/zhensherlock/sp500-mcp-server/mcp-tool-developer.svg" alt="Measured on agentmods" 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 | $0.00014 | $0.02249 |
| Opus 5 | $0.00007 | $0.01125 |
| Sonnet 5 | $0.00003 | $0.00450 |
| Haiku 4.5 | $0.00001 | $0.00225 |
Grade A, and why
mcp-tool-developer 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 5d 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.
The source is not reproduced here
Licensed AGPL-3.0
The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 5d ago First seen · 336 lines · 14 tokens per session scan A f23c3a15b1ce
mcp-tool-developer is an agent published in the GitHub repository zhensherlock/sp500-mcp-server (106 stars, last pushed 2mo ago), licensed AGPL-3.0. It adds 14 tokens to every session and 2,249 once invoked, about $0.0001 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.
Other agents, from other repositories
pb-sync-reviewer
Reviews changes under lib/sync/, import/export, and MCP task write paths against the documented PocketBase v0.23+ gotchas plus prior Codex adversarial data-loss findings. Read-only. Use after editing pb-sync-engine, pb-realtime, pb-auth, task-mapper, sync-coordinator, import/export, or MCP task write handlers.
builder
The local scheduled builder is disabled. scripts/builder-run.sh is an inert tombstone and .claude/commands/build-next.md refuses all issue and repository operations.
night-shift
The scheduled night shift no longer executes pull-request code. With GSDTRIAGEBOTLOGIN configured, scripts/triage-run.sh may perform read-only discovery of failing claude/ pull requests, but it never creates a worktree, checks out a head, invokes Claude, or runs branch-controlled build tools.
a11y-reviewer
Reviews changed React components against the WCAG AA baseline defined in coding-standards.md Part 2. Read-only — returns findings, does not rewrite code. Use after editing any .tsx/.jsx file in components/ or app/.
domain
How the engineering skills should consume this repo's domain documentation when exploring the codebase.
triage-labels
The skills speak in terms of five canonical triage roles. This file maps those roles to the actual label strings used in this repo's issue tracker.