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.
git clone --depth 1 https://github.com/postrv/narsil-mcpWrote 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/commands/postrv/narsil-mcp/find-feature)<a href="https://agentmods.dev/commands/postrv/narsil-mcp/find-feature"><img src="https://agentmods.dev/badge/commands/postrv/narsil-mcp/find-feature.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 5.1 | $0.00013 | $0.00280 |
| Opus 5 | $0.00006 | $0.00140 |
| Sonnet 5 | $0.00003 | $0.00056 |
| Haiku 4.5 | $0.00001 | $0.00028 |
Grade A, and why
find-feature 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 8d 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
Find Feature Implementation
Help locate where a specific feature or concept is implemented in the codebase.
Workflow
-
Parse input: Extract feature description from $ARGUMENTS
-
Semantic search: Use
hybrid_searchwith the feature description to find semantically relevant code (combines BM25 + TF-IDF via Reciprocal Rank Fusion) -
Symbol search: Use
workspace_symbol_searchwith key terms from the feature to find related symbols -
For promising candidates:
- Use
find_symbol_usagesto see how widely each candidate is used - Use
get_symbol_definitionto read the actual implementation
- Use
-
Trace connections (if call-graph enabled):
- Use
get_callersandget_calleesto understand how the feature integrates
- Use
-
Present findings:
- Primary implementation location(s)
- Key functions/classes involved
- How the feature is invoked/used
- Related files and modules
Arguments
Feature to find: $ARGUMENTS
Example usage:
/narsil:find-feature user authentication/narsil:find-feature payment processing/narsil:find-feature error handling
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.
- 8d ago First seen · 38 lines · 13 tokens per session scan A 840c619466cc
find-feature is a command published in the GitHub repository postrv/narsil-mcp (181 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 13 tokens to every session and 280 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 commands, from other repositories
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localnest:remember
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localnest:fact
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localnest:ingest
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localnest:onboard
Run the guided first-run setup wizard that configures everything automatically.
localnest:search
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